| A | B | C | D | E | F | G | H | I | K | L | M | N | P | R | S | T | U | V | W |
| The Virtual Spark Transmitter | |||||||||||||||||||
| Company Name | Date | Location | Comments |
| ACME Wireless Construction Co. | 1909 | Cambridge, MA |
Type "A" set consisting of transmitting helix, key, induction coil, condenser, receiver Type "B" set with heavier duty components and oscillation transformer Type "C" set with heavier duty components yet |
| American Radio and Research Corp. AMRAD | 1915 | Boston, MA (Tufts U.) |
CA136 1/2 KW impact type motor boat set, but contract cancelled CA599 2KW quenched gap set (1917) consisting of: Wave changer------------------CA 761 Loading coil------------------CA 762 Tone Tester-------------------SE 84 Quenched Gap------------------CA 758 Gap Units---------------------CA 759 Gap gaskets-------------------CA 760 Hand Key----------------------CA 763 Condenser---------------------CD 158 Protective Device-------------CD 53A Motor Generator---------------CB 226 Transformer-------------------CAT 463 Antenna Send-rec switch-------CM 412 SCR-74A trench spark gap transmitter of low power |
| American Wireless Co. | 1910 | Boston, MA |
2, 5 and 10 KW rotary gap sets bid in 1911 on US Navy Schedule 2571 (William Walker, Pres.) |
| Laboratoires Louis Ancel (ELLA- Anciens et Louis Ancel) | 1909 | Paris, France | No.4003 induction coil set capable of 10 cm spark. Louis ANCEL catalog dated January, 1914, shows similar equipment on pages 2 & 3. (" Télégraphie & téléphonie sans fil et Télemecanique sans fil" ) |
| Annaka Electric Company | 1900 | Japan | Made a wireless transmitter as early as 1903. 3 KW spark transmitter |
| Armorl (Armstrong-Orling) | 1902 | England |
Armorl system was eventually felt not to be a radio system, but a sensitive ground system relay. Station Transmitter for short distances Station Transmitter for long distances Portable Transmitter |
| Clapp-Eastham | began making radio equipment ca 1910 | Cambridge MA |
"New rotating quenched gap design" 1911 early 1/4 KW transmitter with beautiful wooden cabinet and external spark gap. Hytone 1/2 KW rotary gap ("rotary quenched gap") transmitter, about 1920, Cat. No. Z740 (Z740A if if customer supplies helix and condenser) Hytone 1 KW rotary gap ("rotary quenched gap") transmitter, about 1920, Cat. No.Z771 (Z772 if customer supplies helix and condenser) |
| Thomas E. Clark | 1902 | Detroit, MI | induction coil and panel sets |
| Connecticut Tel. & Elec. Co. | 1915 | CT | BC-15A airplane transmitter with straight gap |
| Cutting and Washington | 1916 | Cambridge, MA |
CP 1110 50W spark airplane impact type transmitter, 375 meters only, consists of: Hand sending key------------CP 1156 Spark gap-------------------CP 1187 Transformer-----------------CP 1188 Concentration and Oscillating condenser--------CD 1275 Primary condenser-----------CD 1196 CP 1110A same as CP 1110A except in small details 1/4 KW Panel Set CP 104 1/2 KW Motor Boat Set 1917 consisting of: Spark Gap-------------CP 337 Power Unit------------CO 129 Receiver--------------CN 114 Condenser-------------CD 589 Wave Meter------------CAG 519 CP 813 1/2 KW impact type set, same as CP 104 except power unit is CB 810 CP 964 2 KW Panel type transmitter, 2 wavelengths 756-952 meters consisting of: Complete 2 KW Chaffee impact type gap-----------CP 1046 Condenser---------------------------------------CD 1045 Transformer-------------------------------------CP 1050 |
| DeForest | 1901-1914 | New Jersey |
Early high power commercial and military stations (e.g. Guantanamo Bay, Cuba) Straight gap sets with Leyden jar condensers at Waldorf-Astoria and Nassau Hotel 1/2 KW straight gap set with key in 500 volt circuit and breaks under oil 1 KW straight gap set |
| Dubilier | 1910 | London, England | Small portable wireless set
with large integral key. Wooden enclosure. Entire set weighed about 17 pounds. Made a variable tone
spark transmitter as pack set with key in front (see the OTB, March 1980, pg. 29). Quenched gap "musical spark" transmitter 1910 |
| Duck, Wm. B. | ca 1915 | Toledo, OH | Note that Duck supplied other manufacturer's products
under his own name, as well as his own products. Commercial Equipment in Catalog No.9 (ca 1916): "Hytone" transmitting sets (switchboard on 1.5" marble, angle iron framework, meters, switches, loading coil, oscillation transformer, rotary spark gap, motor, key, transformer, condenser and directions) : 1/2 KW rotary gap "quenched spark" set $110 complete 1 KW rotary gap set $275 complete 2 KW rotary gap set $825 complete 3 KW rotary gap set $1075 complete 5 KW rotary gap set $1275 complete 10 KW rotary gap set $2390 complete Transmitting Set No. B6004 ($66.50 complete, range 75-150 miles), consisting of: No.63XO Type T-O Flexible Transformer No.63X01 Sayville Rotary Gap (Halcun) No.A6052 1/2-KW High Potential Glass Plate Condenser No.A395 Commercial Type Oscillation transformer No.60X80 Boston Key No.A143 Precision Hot wire meter Transmitting Set No. A6009 ($87.50 complete, range 75-200 miles), consisting of: No.63X1 Type T-I 3/4 KW Flexible Transformer(br> No.63X01 Sayville Rotary Gap No.A6053 1-KW High Potential Glass Plate Condenser No.A395 Commercial Type Oscillation Transformer No.60X80 Boston Key No.A143 Precision Hot wire meter Transmitting Set No.A6010 ($94.25 complete, range 100-400 miles) consisting of: No.63X2 Type T-2 1-KW Flexible Transformer No.63X01 Sayville Rotary Gap No.A6053 1-KW High Potential Glass Plate Condenser No.A395 Commercial Type Oscillation Transformer No.A144 Precision Hot Wire Meter Sets for Amateurs: Set No.90X71: "Parlor Set", range 1-3 miles, $5.50 complete consisting of: No.39X0 1/4-in. spark coil No.60X15A Spark Gap No.10X1 Reliable Key 3 Red Seal Dry Batteries (Receiving set included) No. 60X00 transmitting set Mounted Combined Transmitting and Receiving Sets (all plain gap) No.D20 (1" spark coil), D21 (1.5" spark coil), D22 (2" spark coil), & D23 (1/4" spark coil) No.D24 (same as D23 with 1/2" spark coil) No.D25 (same as D23 with 1" spark coil and transmitting helix) No.D26 comprised of same transmitter as D23, different receiver No.D27 comprised of same transmitter as D24, different receiver No.D28 comprised of: No.42X0 2" spark coil No.A1916 Sending Condenser No.60X15 spark gap Special Helix No.A562 Junior Wireless Key No.71X0 D.P.D.T. Switch No.D29 same as D28 transmitting & receiving set with different receiver components No.D29A same as No.D29 excepting a 3" spark coil and two No.1916 condensers Transmitting Set No.A5998 with No.39X0 1/4" spark coil Transmitting Set No.A5999 with No.40X0 1/2" spark coil Transmitting Set No.A6000 with No.44X6 1" spark coil Transmitting Set No.A6001, same as A6000 with Junior Oscillation Transformer Transmitting Set No.A6002 with No.42X0 2" spark coil Transmitting Set No.A6003 with No.43X0 spark coil and No.A4018 zinc spark gap Transmitting Set No.A6004 same as A6003 with 4” spark coil Transmitting Set No.A6005 with No.45X0 6” spark coil Transmitting Set No.A6006, No.A6007, and No.A6008 with progressively higher voltage transformer, condensers, and spark gaps Transmitting Set No.A100 consisting of: Type "RS" 1/4 KW Thordarson Flexible Transformer with protective device No.1007 Type D rotary Gap No.A6051 1/4 KW Glass Plate high potential condenser No.A7628 Oscillation transformer No.A936 Standard Key with 1/4 inch coin silver contacts N.W647 Hot Wire meter Transmitting Set No.A101 consisting of: Type "RS" 1/2 KW Thordarson Flexible Transformer with protective device No.1008 Type D rotary Gap No.A6052 1/2 KW Glass Plate high potential condenser No.A395 Commercial Type Oscillation transformer No.60x80 Boston Key N.W648 Hot Wire meter Transmitting Set No.A102 consisting of: Type "RS" 1/2 KW Thordarson Flexible Transformer with protective device No.1008 Type D rotary Gap No.A6052 1/2 KW Glass Plate high potential condenser No.A7628 Commercial Type Oscillation transformer No.A986 Standard Key with 1/4" coin silver contacts N.W648 Hot Wire meter Transmitting Set No.A103 consisting of: Type "R" 1 KW Thordarson Flexible Transformer with protective device No.1008 Type D rotary Gap No.A6053 1 KW Glass Plate high potential condenser No.A395 Commercial Type Oscillation transformer No.60x81 Boston Key N.W649 Hot Wire meter |
| Ducretet and Roger | 1899-1919 | Paris,Fr. | Early pioneering efforts. Straight gap sets |
| Electro Importing EICO | 1904-1915+ | New York |
From the 1914 catalog Telimco No.1, No.4 and probably Nos. 2 & 3, small power straight gap induction coil sets sold for just over $8 initially. From the 1914 & 1915 catalogs: Intercity Sending Outfit, consisting of 1" spark coil and strap key (the Boy Scout's No.S.O.-1) From the 1915 catalog: No. S.O.-1/4 consisting of: No.4360 1/4 inch spark coil No.9220 Zinc spark gap No.1119 "Electro" strap key No.1001 3 "Electro" dry cells No.9219 50 ft. Antenium wire No.9461 8 antenna insulators No.1313 D.P.D.T. porcelain switch No. S.O.-1/2 same as S.O- 1/4 except with 1/2" spark coil No. S.O.-5 consisting of: No.1088 1" spark coil No.9260 "Electro" adjustable condenser No.9220 Zinc spark gap No.9270 sending helix No.1119 "Electro" strap key No.9219 100 feet Antenium wire No.9461 8 antenna insulators No.1001 5 "Electro" dry cells No.1313 D.P.D.T. porcelain switch No. S.O.-10 consisting of: No.4366 1-1/2 inch spark coil No.9260 adjustable condenser No.9220 Zinc spark gap No.1119 "Electro" strap key No.8271 sending helix No.9219 100 feet Antenium wire No.9461 8 antenna insulators No.1001 6 "Electro" dry cells No.1313 D.P.D.T. porcelain switch No. S.O.-15 consisting of: No.1089 2" spark coil No.8271 sending helix No.9220 Zinc spark gap No.1119 "Electro" strap key No.1001 8 "Electro" dry cells No.9219 200 feet Antenium wire No.10007 8 antenna insulators No.1313 D.P.D.T. porcelain switch No. S.O.-50 consisting of: No.8050 1/2 KW transformer coil No.9220a adjustable zinc spark gap No.530 adjustable high tension condenser No.8271 sending helix No.8000 Gernsback electrolytic interruptor No.8001 D.P.D.T. Switch block with 2 fuses No.8100 "Electro" Antenna Switch No.9219 300 feet antenium wire No.10007 8 antenna insulators No.10002 commercial insulators No. S.O.-100 consisting of: No.8050 1/2 KW transformer coil No.9225 commercial spark gap No.8271 sending helix No.530 adjustable high tension condenser No.8000 Gernsback electrolytic interruptor No.8001 D.P.D.T. Switch block with 2 fuses No.9212 Wireless key No.8100 "Electro" Antenna Switch No.9219 300 feet Antenium wire No.10001 12 "Electrose" ball insulators No.10002 2 commercial insulators NO.10003 Ground clamp No. S.O.-200 consisting of: No.8050 2 1/2-KW transformer coils No.9225 commercial spark gap No.9600 "Electro" Oscillation transformer No.531 high tension condenser No.8000 Gernsback electrolytic interruptor No.8001 D.P.D.T. Switch block with 2 fuses No.9213 wireless key, special extra heavy duty contacts No.10099 special condenser tp absorb spark of key No.8100 "Electro" Antenna Switch No.9219 600 feet Antenium wire No.10001 16 "Electrose" ball insulators No.10002 2 commercial insulators NO.10003 Ground clamp |
| Electro-Set Co. | 1914 | Cleveland, OH |
No.XII Sending Set (sending range 1000 ft. to 1/4 mile) consisting of: No.F-90 1/8-inch spark coil No.F-91 Tele-key No.801 Spark Gap No.X-22 Sending Set (range 1/8 to 1/2 mile) consisting of: No.7001 1/2-inch spark coil No.F-91 Tele-key No.801 Spark Gap No.X-33 Sending Set (sending range 5 to 8 miles) consisting of: No.7002 1 inch spark coil No.802 Spark Gap No.490 Amateur key No.607 Oscillation Helix No.600 Leyden Jar |
| Fessenden (Fessenden in US and also Fessenden Wireless Co. of Canada) | 1909 & earlier | Canada & US |
Also see National Electric Signalling Co. 25 KW 500 cycle rotary gap set for Colon, Panama among many others 2 & 5 KW quenched gap 500 cycle transmitters 1910 for Navy contract 13422 |
| Handel Electric Co. | QST ad Feb/1917 | NYC, NY |
Complete Wireless Station, sends 3 to 5 miles. Unassembled ($7.95) or assembled ($8.85) on mahogany board. |
| Hunt & McCree | 1912 | New York |
No. 796 complete transmitter No. 797 complete transmitter No. 800 complete transmitter |
| International Radio Telegraph Co. (succeeded NESCO, see below, and eventually bought by Westinghouse) | ca. 1920 | Pittsburgh, PA |
SE-1300 and SE-1310 flying boat transmitters for Flying Boats HS-1 and HS-2 (1918) SE 1075 1 KW 500 cycle Panel Type Transmitter 1918 for use on submarine chasers, consisting of: Motor Generator --------------------Type CB 232B Power Transformer-------------------Type CAT 1258 Quenched Spark Gap Holder & Units---SE 1063 & SE 1001 Condenser---------------------------CD 158 Oscillation Transformer-------------SE 1074 Lightning Switch--------------------SE 163 Send-Rec Switch---------------------SE 994 Auxiliary Hand Sending Key----------CAM 1189 Relay Key---------------------------CAG 457 Morse Relay Operating Key-----------CAM 809 Protective Device-------------------CD 872 CE-859B 1/2 KW Panel Radio Transmitting Set (1917) Quenched Gap CQ-154 1/2 KW motor boat set quenched gap fitted for audion consisting of: Quenched gap-----------------------CQ144 Gap Units--------------------------CQ645 Power Unit-------------------------CO128 Receiver---------------------------CN597 Exciter generator------------------CB215 CQ-812 same as CQ-154 with CB 233 power unit CQ-101 1/2 KW Motor boat set quenched gap fitted for audion CQ-320 same as CQ-101 with different arrangement of components CQ-1111 1/2 KW international airplane set spark type streamline 500 watts |
| Kilbourne and Clark | 1901-1920+ | Seattle, WA |
Marine Panel sets used mainly on the Pacific Coast Type B 250W Simpson Radio transmitter From Condensed Bulletin Sheets, K&C Radio Telegraph Apparatus (Catalog Bulletin S-3 probably ca 1919): 1/2 KW Simpson Mercury Valve (Quenched Gap) Transmitter (Type E, Form 3)-- The valve "assists in the perfect quenching of the spark gap." 1/2KW Simpson sets as early as 1916 1, 2, & 5 KW Simpson Mercury Valve (Quenched Gap) Transmitters (Type E, Form 2) 1/2 KW rotary gap Navy Radio Transmitter (1917) CK 617 2 KW quenched gap transmitter with battery charging panel consisting of: Spark gap & condenser mounting------CL 310 Units & gaskets for gap-------------CL 311 Wave changer------------------------SE 108 Loading coil------------------------SE 109 Switchboard-------------------------CK 618 Motor generator---------------------CB 226 Hand Key----------------------------SE 68 Condenser---------------------------CD 158 Protective device-------------------CD 53 Transformer-------------------------CAT 463 Antenna send-rec switch-------------CM 412 Lightning Switch--------------------SE 163 Tone tester-------------------------SE 84 CK 621 1 KW quenched gap transmitter with battery charging panel consisting of: Spark gap and condenser mounting----CL 312 Gap Units---------------------------CL 313 Wave Changer & Osc. Trans.----------SE 155 Loading Coil------------------------SE 431 Switchboard-------------------------CK 622 Hand Key----------------------------SE 68 Condenser---------------------------CD 158 Protective Device-------------------CD 53 Motor Generator---------------------CB 232 Transformer-------------------------CAT 517 Send-rec switch---------------------CM 412 Lightning Switch--------------------SE 163 Tone tester-------------------------SE 84 |
| Liberty Electric Corporation | 1919 | Port Chester, NY |
Type B-1 Panel Radio Transmitter, rotary gap, 750 watt |
| Lowenstein Radio Co. | 1918, but drawings of Lowenstein keys as early as 1916 exist | Brooklyn NY |
CL 342, 344, 345, 346, 2 KW Transmitting Set 1917 consisting of: Wave Changer-------------------SE 89; SE 108 on CL 346 Loading Coil-------------------SE 90; SE 109 on CL 346 Switch Board-------------------SE 81-A; CL 467 on CL 345; CL 469 on CL 345 Quenched Gap-------------------CL 310 Gap Units----------------------CL 311 Gap Gaskets--------------------CL 458 and CL 459 Non-synchronous gap------------SE 64; SE 194 on CL 345 Combined Hand and Relay Key----CAG 457; CAG 468 on CL 345 Hand Key-----------------------CL 462 Condenser----------------------CD 54 and CD 158 Protective Device--------------CD 53 Motor Generator----------------CB 226; CB 227 on CL 345 Transformer--------------------CAT 463 Antenna send/rec switch--------CM 412 Lightning Switch---------------SE 163 Tone tester--------------------SE 84 CL 343 10 KW radio transmitter consisting of: Wave Changer-------------------SE 327 Loading Coil-------------------SE 328 Switchboard--------------------CL 464 Quenched Gap-------------------CL 325 Gap Units----------------------CL 326 Gap Gaskets--------------------CL 461 Non synchronous gap------------SE 516 Relay Key----------------------CL 419 Hand Key-----------------------CL 830 Condenser----------------------CD 54 and CD 158 Protective Device--------------CD 53 Motor Generator----------------CB 220 Transformer--------------------CAT 465 Antenna send/rec switch--------CM 422 Lightning switch---------------CL 466 Tone tester--------------------SE 84 CL 470 5 KW transmitter with 120 VDC drive consisting of: Wave changer-------------------SE 87 Loading Coil-------------------SE 88 Switchboard--------------------SE 80A Quenched Gap-------------------CL 475 Quenched Gap units-------------CL 476 Quenched Gap gaskets-----------CL 477 & CL 478 Nonsynchronous gap-------------SE 64 Relay Key----------------------CL 419 Hand Key-----------------------CL 462 Condenser----------------------CD 54 or CD 158 Protective device--------------CD 53 Motor generator----------------CB 223 Transformer--------------------CAT 489 Antenna send-rec switch--------SE 165 Lightning Switch---------------SE 163 Tone Tester--------------------SE 84 CL 471 5 KW transmitter with 80 VDC supply consisting of: Wave changer-------------------SE 87 Loading Coil-------------------SE 88 Switchboard--------------------SE 479 Quenched Gap-------------------CL 475 Quenched Gap units-------------CL 476 Quenched Gap gaskets-----------CL 477 & CL 478 Nonsynchronous gap-------------SE 194 Relay Key----------------------CL 487 Hand Key-----------------------CL 462 Condenser----------------------CD 54 or CD 158 Protective device--------------CD 53 Motor generator----------------CB 488 Transformer--------------------CAT 489 Antenna send-rec switch--------SE 165 Lightning Switch---------------SE 163 Tone Tester--------------------SE 84 CL 472 5 KW transmitter with 230 VDC supply consisting of: Wave changer-------------------SE 87 Loading Coil-------------------SE 88 Switchboard--------------------SE 480 Quenched Gap-------------------CL 475 Quenched Gap units-------------CL 476 Quenched Gap gaskets-----------CL 477 & CL 478 Nonsynchronous gap-------------SE 414 Relay Key----------------------CL 419 Hand Key-----------------------CL 462 Condenser----------------------CD 54 or CD 158 Protective device--------------CD 53 Motor generator----------------CB 422 Transformer--------------------CAT 489 Antenna send-rec switch--------SE 165 Lightning Switch---------------SE 163 Tone Tester--------------------SE 84 CL 473 5 KW transmitter with 110 VAC supply consisting of: Wave changer-------------------SE 87 Loading Coil-------------------SE 88 Switchboard--------------------SE 481 Quenched Gap-------------------CL 475 Quenched Gap units-------------CL 476 Quenched Gap gaskets-----------CL 477 & CL 478 Nonsynchronous gap-------------SE 64 Relay Key----------------------CL 419 Hand Key-----------------------CL 462 Condenser----------------------CD 54 or CD 158 Protective device--------------CD 53 Motor generator----------------CB 456 Transformer--------------------CAT 489 Antenna send-rec switch--------SE 165 Lightning Switch---------------SE 163 Tone Tester--------------------SE 84 CL 474 5 KW transmitter with 220 VAC supply consisting of: Wave changer-------------------SE 87 Loading Coil-------------------SE 88 Switchboard--------------------SE 482 Quenched Gap-------------------CL 475 Quenched Gap units-------------CL 476 Quenched Gap gaskets-----------CL 477 & CL 478 Nonsynchronous gap-------------SE 64 Relay Key----------------------CL 419 Hand Key-----------------------CL 462 Condenser----------------------CD 54 or CD 158 Protective device--------------CD 53 Motor generator----------------CB 455 Transformer--------------------CAT 489 Antenna send-rec switch--------SE 165 Lightning Switch---------------SE 163 Tone Tester--------------------SE 84 Lowenstein 5 KW Type "P" Quenched spark system (1915) Lowenstein 5 KW Type "N" Quenched spark system Lowenstein 1/2 KW Model "V" 1919 All 2, 5, and 10 KW spark transmitters on combatant U.S. Navy ships in WW1 were equipped with the Lowenstein model BC buzzer components which could be substituted for the gap by a simple switching arrangement (Howeth). Ships equipped with other transmitters used the model BD motor buzzer transmitter. |
| Manhattan Electric Supply Co. (MESCO) | 1910 | New York |
Type "A" transmitting set with 1" spark coil and zinc spark gap List No.476 Type "B" transmitting set with 2" spark coil and "high efficiency spark gap" List No.477 Type "C" transmitting set with 1" or 2" spark coil, List No. 490 and 491 "Transmitting Set" in catalogue No.12 consisting of: No.462 1" MESCO spark coil No.467 Spark Gap No.424 Oscillation Transformer Section No.483, 0.0017 Transmitting Condenser No.81 MESCO Hand Radio Key 8 Red Seal type "A" batteries |
| American, Canadian & British Marconi | 1912-1920 | Aldene, NJ |
10 inch induction coil sets High powered coastal stations (e.g. Poldhu, Cape Breton) usually with huge rotary gap transmitters Probably earliest standard (1913) British main ship sets: Type 1 (old Mark II main-power set) Type 2 (old Mark I original Low-power set) Type 3 battleship auxiliary set Type 4 destroyer set Types 5 & 6 portable and harbour defence sets Type 9 cruiser auxiliary set Type 10 submarine sets Canadian Marconi model #1216 spark set salvaged from a submarine STANDARD MARINE SETS (for a complete discussion of Marconi Standard Marine Sets, see Practical Wireless Telegraphy, by Bucher, 1921, p. 223) : P-4 2 KW Quenched Gap 500 cycle Panel Set; complete set comprising the following apparatus: 1. Panel Transmitter consisting of the necessary power measuring instruments, oscillation transformer, condenser, variable and plug type aerial tuning inductance, quenched spark gap, motor and generator field rheostats, wave length changing switch, several resistance units and a compensating reactance regulator. 2. Crocker-Wheeler or General Electric 2 K.W. 500 cycle Motor Generator with synchronous rotary spark gap mounted on the generator shaft, protective condensers, starting resistance, automatic motor starter, and necessary controlling appliances. 3. Type 106 Receiving Tuner with crystal rectifier and head telephone receiver. 4. Type I Aerial Change-Over Switch with necessary appliances for protecting the receiving apparatus from the transmitter. 5. Type C Transmitting Key. 6. High Potential Closed Core Transformer. C-3 2 kw Cart set P-4 2 KW set P-8 and P-8A 2 KW sets P-5 1/2 KW Quenched Gap 500 cycle Panel Transmitter (similar to P-4 with certain mechanical modifications) P-9 1/4 KW 500 cycle Cargo Transmitting set, rotary gap, in an angle iron frame rather than a standard frame P-12 1/2 KW Panel Set (1917) P-17 2 KW set P-18 1 KW set 1 KW 60 cycle transmitter, non-synchronous rotary gap 2 KW 240 cycle transmitter, synchronous rotary gap E-2 1/2 KW Quenched Gap 120 cycle Panel Transmitter. Designed for the two standard wavelengths, 300 and 600 meters. For emergency use, a rotary spark gap is mounted on the end of the motor generator shaft. See Bucher pg. 244 for diagrams. See letter written in 1962 for historical info on the E-2. 1/2 KWCargo set sold to Brazil (Type M-1) 327-17 2 KW and 5 KW sets for Bureau of Posts Army contract 1480 5 KW set Type 379 1 KW set Type 380 2 KW set Type 531 1/2KW set British Standard Marine CABINET sets (see Percy W. Harris, "The Maintenance of Wireless Telegraph Apparatus", 1917): 1/4 KW rotary gap set also used as emergency set with larger units; 1/2 KW rotary gap set; 1-1/2 KW rotary gap set; 5 KW rotary gap set; PORTABLE (PACK or WHEELED) sets: A2 Rotary Gap Type B1 Motorcycle set ?spark Type C1 2 KW Field Wagon Set 500 cycle Quenched Gap C2 Type M1 Mule Pack set 1/2 KW 500 cycle LIFEBOAT transmitter: Type 241A Quenched Gap CM 295 Aeroplane Set (16 made) consisting of: Gap complete-----------CM 393 Gap plates-------------CM 393 Condenser--------------CD 154 or CD 158 Key--------------------CM 394 Generator--------------CM 395 Reel-------------------CM 396 Transformer------------CM 397 Wave changer/load coil-CM 398 CM 98 1/2 KW Motor Boat Set with Gasoline Engine Drive 1917 consisting of: Wave Changer------------CM 399 Loading Coils-----------CM 400 Quenched Gap------------CM 338 Gap Units---------------CM 329 Gap Gaskets-------------CM 329 Hand Key----------------SE 86 Condenser---------------CD 54 or CD 158 Protective Device-------CD 53 Transformer-------------CM 402 Antenna Send/Rec Switch-CM 797 Receiver----------------CM 105 Power Unit--------------CO 128 CM 296, CM 296A, CM 296B, CM 296C 1/2 KW Panel Sets consisting of: Complete Quenched Gap--------------CM 338 Gap Units--------------------------CM 329 Wave Changer-----------------------CM 399 Loading Coil-----------------------CM 400 Antenna Send/Rec Switch------------CM 401 Hand Key---------------------------CM 86 Condenser--------------------------CD 54 or CD 158 Protective Device------------------CD 53/156 on CM 296A Motor Generator--------------------CB 233 Transformer------------------------CM 402 Lightning Switch-------------------CM 403 CM 297, CM 298, CM 299, CM 301 5 KW transmitting sets consisting of: Gap mounting and condenser rack----CM 404 Plate Units and Gasket-------------CM 405 Non Synchronous Gap----------------SE 65/ SE 414 on CM 298 and CM 299; SE 64 on CM 301 Switchboard------------------------CM 407; 413 on CM 298; CM 406 on CM 299; CM 416 on CM 301 Wave Changer-----------------------SE 87 Loading Coil-----------------------SE 88 Relay Key--------------------------CM 408/ CM 409 on CM 298 Hand Key---------------------------CM 410 Condenser--------------------------CD 54 or CD 158 Protective Device------------------CD 53 Motor Generator--------------------CB 455/CB 222 on CM 298 Transformer------------------------CM 411 Antenna send/rec switch------------CM 412 Tone Tester------------------------SE 84 Lightning Switch-------------------SE 163 CM 304 10 KW transmitting set 1917 consisting of: Wave Changer-----------------------SE 327 Loading Coil-----------------------SE 328 Switchboard------------------------CM 418 Tone tester------------------------SE 64 Quenched gap with mounting and condenser rack--- CM 417 Gap Units--------------------------CM 405 Non synchronous gap----------------SE 414 Hand Key---------------------------CM 420 Relay Key--------------------------CL 419 Condenser--------------------------CD 54 and CD 158 Protective Device------------------CD 53 Motor Generator--------------------CB 220 Transformer------------------------CM 421 Antenna Send/Rec switch------------CM 422 Lightning Switch-------------------CM 423 Duplicate Motor Generators CM 305, 306, 307, 307A 2 KW transmitting sets 1917 consisting of: Wave Changer-----------------------SE 108; SE 89 on CM 306 and up Loading coil-----------------------SE 109; SE 90 on CM 306 Switchboard------------------------CM 424; CM 427 on CM 306 Tone tester------------------------SE 84 Quenched gap mounting/rack---------CL 310; CM 314 on CM 306 and up Gap Units & Gaskets----------------CL 311; CM 315 on CM 306 and up Non synchronous gap----------------SE 64 on CM 306 and up Condenser--------------------------CD 154 and CD 158 Protective Device------------------CD 53 Motor Generator--------------------CB 226; CB 238 on CM 307 and CM 307A; Transformer------------------------CM 426 Antenna send/rec switch------------CM 412 Lightning Switch-------------------SE 163 Relay Key--------------------------CM 428 or CM 408 on CM 306 Hand Key---------------------------Auxiliary Hand Key CM 425 on CM 306 and up Power Unit Complete----------------CO 317 on CM 307; CO 319 on CM 307A Gasoline Engine--------------------CO 316 on CM 307; CO 318 on CM 307A CM 308 5 KW transmitter 1917 (only one made) CM 309 1 KW transmitter 1917 (50 made) consisting of: Wave changer-----------------------SE 155 Loading coils----------------------SE 431 Switch board-----------------------CM 430 Tone Tester------------------------SE 84 Quenched Gap and Condenser Rack----CL 312 Gap Units--------------------------CL 313 Hand Key---------------------------CM 425 Condenser--------------------------CD 54 or CD 158 Protective Device------------------CD 53 Motor Generator--------------------CAJ 601 Transformer------------------------CM 432 Antenna send/rec switch------------CM 412 Lightning switch-------------------SE 163 CM 433 1/2 KW Panel Type Set with quenched and rotary gap consisting of: Quenched gap-----------------------CM 434 Inside plates----------------------CM 438 Outside plates---------------------CM 439 Rotary gap-------------------------CM 435 Condenser jars---------------------CM 436 Hand Key---------------------------CM 437 Motor generator--------------------CM 440 Transformer------------------------CM 441 Antenna send-rec switch------------CM 401 Receiver---------------------------CM 442 CM 443 1/2 KW Cargo Set with synchronous rotary gap consisting of: Synchronous rotary gap-------------CM 435 Condenser jars---------------------CM 436 Hand Key---------------------------CM 437 Motor Generator--------------------CM 440 Transformer------------------------CM 441 Antenna send-rec switch------------CM 401 Receiver---------------------------CM 445 CM 446 2 KW commercial type panel set with quenched and rotary gap CM 858 9 frequencies, use on battleships, 5 KW rig for 120 V supply consisting of: Wave Changer-------------------SE 719A Loading Coil-------------------SE 88 Switchboard--------------------CM 857 Tone tester--------------------SE 84 Quenched Gap-------------------CM 404 Assembled Gasket---------------CM 405 Nonsynchronous gap-------------SE 64 Relay Key----------------------CM 408 Hand Key-----------------------CM 410 Condenser----------------------CD 158 Protective Device--------------CD 53 Motor generator----------------CB 223 Transformer--------------------CM 411 Antenna send-rec switch--------SE 165 Lightning Switch---------------SE 163 CM 1080 for use by the Shipping Board, 2 KW set, consists of: Gap holder & condenser mounting-----SE 310 Nonsynchronous gap------------------SE 64 Gap units---------------------------SE 1002 Switchboard-------------------------CM 424 Loading coils-----------------------SE 109 Wave changer------------------------SE 842 Lightning Switch--------------------SE 163 Hand Key----------------------------SE 68 Condenser---------------------------CD 158 Protective device-------------------CD 53 Motor generator---------------------CB 226 Transformer-------------------------CM 426 Antenna switch----------------------CM 412 Tone tester-------------------------SE 84 SE 1121 Panel transmitter CM 1122 2 KW set supplied to St. Thomas same as CM 305 except that motor-generator shaft extended and coupled to 440 VDC motor. CM 1123 5 KW set supplied to Pensacola. Same as CM 299 except motor generator shaft extended and coupled to 220 V induction motor/CB 455. CM 1124 5 KW set supplied to St. Augustine. Same as CM 299 except motor generator for 220 V single phase induction motor. SE 1205 2 KW quenched gap transmitter 120 VDC 3 wavelengths consisting of: Quenched gap holder----------------SE 310 Quenched gap units-----------------SE 1002 Quenched gap gaskets compression---SE 1003 Quenched gap gasket bolt-----------SE 1004 Nonsynchronous gap-----------------SE 64 Switchboard------------------------SE 81B Wave changer-----------------------SE 842 Loading coils----------------------SE 109 Hand Key---------------------------SE 68A Condenser--------------------------CD 158A Protective device------------------CD 53A Motor generator--------------------CB 226 SE 1205A (canceled), SE 1205B 2 KW sets Model S 10 KW set Phillipine 20 KW set 3 phase 60 cycle 20 KW set 25 KW transmitter with rotary gap (disc discharger) Special Submarine Type Panel Transmitter, quenched gap QMS 1/2 KW Quenched Spark Gap Transmitter 1919 Emergency Quenched Gap transmitter Type 335 SE 1060 500 cycle 120VDC panel type quenched gap transmitter 1 KW (1917) consisting of: Motor generator-------------------CB 232 Radio transmitter-----------------SE 1121 Transformer-----------------------SE 1004 Quenched Gap Rack-----------------SE 1063 Gaskets & Gap Units---------------SE 1001 Wavechanger-----------------------SE 1061 Condenser-------------------------CD 158 Loading Coils---------------------SE 1032 Protective device-----------------CD 53A Hand Sending Key------------------CM 425 Antenna Send-Rec Switch-----------CM 412 Lightning Switch------------------SE 163 SE 1116 1 KW 126 meter set consisting of: Panel transmitter-----------------SE 1164 Motor generator-------------------CB 232 Transformer-----------------------SE 1064 Quenched gap rack-----------------SE 1063 Quenched gap unit-----------------SE 1001 Gasket (compression)--------------SE 1003 Gasket (bolt)---------------------SE 1004 Condenser rack--------------------SE 1165 Wave changer----------------------SE 1117 Condenser-------------------------CD 158, CD 158A Loading coils---------------------SE 1118 Protective device-----------------SE 53A Hand Key--------------------------CM 425 Antenna send-rec switch-----------SE 412 Lightning switch------------------SE 163 Special antenna condenser---------SE 1119 Italian order 1KW 60 cycle nonsychronous gap Marconi 1 Field Artillery Command Set 50W 1914 |
| Massachusetts Wireless Equipment Co. | 1908 | Boston, MA |
5 KW straight gap sets -- 2 sold to Navy in 1908. Wm.L. Walker Gen.Mgr. |
| Massie Wireless Telegraph Co. | 1905-1909 | Rhode Island |
Open gap sets with blower 3 KW, 60 cycle set straight gap set at Cape Henlopen 5 KW, 60 cycle set straight gap set at Beaufort, NC 5 KW, 60 cycle set straight gap set at Navy Yard, Charleston, SC 10 KW and 15 KW sets also. |
| Wm. J. Murdock | about 1909 | Chelsea, MA |
Type 410 1/2 KW transmitter 1 KW Rotary Gap transmitter 3-5 set with 15 watt spark coil 6-10 set with 25 watt spark coil 15-20 set with 50 watt spark c0il From the April, 1910 catalog: Standard transmitting sets No.501: 1/4 KW, 1/2 KW, 1 KW, and 2 KW including transformer, condenser, helix, spark gap and key. Straight gap. Standard transmitting sets No.502: 1/4 KW, 1/2 KW, 1 KW, and 2 KW including transformer, helix, key, spark gap, anchor gap, antenna switch, protective devices, and glass plate condenser Complete "AM" sets No.260, 261 and 262 for 15, 25, and 50 watt setups with different size spark coils |
| National Electric Signalling Co. NESCO | 1902 | Philadelphia |
Pack Set tested by U.S. Navy, 1916. CQ 101 1/2 KW Motor Boat Set 1917 consisting of: Power Unit----------CO 128 Exciter Generator---CB 215 Transformer Spark Gap Receiver------------CN 597 CQ 320 1/2 KW Motor Boat set, same as CQ 101 with different layout of apparatus CQ 154 1/2 KW Motor Boat Set 1918 consisting of: Wave Changer Loading Coil Quenched Gap Gap Units Gap Gaskets Hand Key Condenser Power Unit-------------CO 128 Transformer Receiver---------------CN 597 Exciter/Generator------CB 215 2 KW set on Signal Corps proposal 428, 1910 5 KW set & 10 KW sets (Navy bids in 1911 on Schedule 2571) 25 KW sets sold to Colon station and on the Connecticut (moved to Key West) 100 KW Rotary gap 500 cycle set |
| National Electric Supply Co. NESCO | 1899 | Washington, D.C. |
1/4 KW Quenched Gap airplane transmitter (1918) made for U.S. Navy PACK sets for the U.S. Navy and Signal Corps: Fleet set 1909 Open Gap Sweet set 1910 Quenched Gap Battleship set 1912 Quenched Gap Navy Type A 1912 Quenched Gap Navy Type B 1913 Quenched Gap Navy Type C 1913 Quenched Gap Navy Type D 1914 Quenched Gap Navy Type E 1916 Quenched Gap Navy Type F (CN 241-254) consisting of: Portable Antenna & Counterpoise----CN 242 Portable Mast----------------------CN 243 Power Unit-------------------------CN 244 Transmitter & Receiver in Chest----CN 250 Receiver---------------------------CN 112 Gasoline Engine for CN 244---------CN 246 Hand Generator for CN 244----------CN 247 D.C. Motor for CN 244--------------CN 248 Signal Corps Model 1908 Open Gap Signal Corps Model 1912 Quenched Gap Signal Corps Model 1913 Quenched Gap Signal Corps Model 1914 Quenched Gap Signal Corps Model 1915 (probably SCR-44) Quenched Gap Signal Corps Model 1916 (SCR-49) Quenched Gap CN 100 1917 1/2 KW Motor Boat Set consists of: Power Unit---------CO 128 Exciter Generator--CB 215 Transformer--------CN 580 Spark Gap----------CN 333 Key----------------CN 582 Receiver-----------CN 112 |
| Shoemaker System (International Telegraph Construction Co.) | 1905 | ? |
Straight spark gap transmitters for US Navy, installed on Virginia, Connecticut, Rhode Island,
New Jersey, Washington. |
| Siemens Bros. & Co. Ltd. | ? | London |
Cabinet type wireless station for use on small yachts |
| Simon, Emil J. | 1915 | New York |
CE615 1/2 KW airplane transmitter panel type, quenched gap, consisting of: Quenched gap----------------CE 689 Gap plates------------------CE 690 Gap gasket------------------CE 691 Wave changer, oscillation transformer and loading coil---CE 692 Hand Key--------------------CE 693 Condenser-------------------CD 688 Protective device-----------CD 694 Generator system------------CE 695 Transformer-----------------CE 698 Reactance-------------------CE 699 Reel------------------------CE 702 Generator-------------------CAW 616 Fan for generator-----------CE 696 Brake for generator---------CE 697 CE-615A 1/2 KW airplane transmitter same as CE 615 except Crocker-Wheeler generator CB 837 and power unit CB 848. CE700 1/2KW aircraft set, same as CE-615 except for wavelength range. Wave Changer CE 701. CE-606 and CE-606A 0.5-1.0 MHz, 0.5 kW Panel Type sets 1917-- see data for Wireless Improvement Co. below CE-827 0.315-1.0 MHz, 0.5 kW panel type quenched gap set, ca. 1918 6 frequencies for use on subs and tugs consisting of: Quenched gap holder--------------CE 607 Plate units----------------------CE 829 Gap Gaskets----------------------CE 609 Wave changer, oscillation transformer and loading coil---CE 828 Hand Key-------------------------CE 611 Condenser------------------------CD 158 Protective device----------------CD 156 Motor generator------------------CB 233 Transformer----------------------CE 612 Send Rec Switch------------------CE 613 CE-859 0.315-1.0 MHz, 0.5 kW, 1917, panel type transmitter for 120 VDC drive, consisting of: Quenched gap holder---------------CE 607 Gap Units-------------------------CE 829 Wave changer, oscillation transformer and loading coil---CE 860 Condenser-------------------------CD 158 Protective Device-----------------CD 156 Motor Generator-------------------CB 233 Transformer-----------------------CE 612 Antenna Send-rec switch-----------CE 613 CE-859A 1/2 KW radio transmitter CE-859B 1/2 KW (1917) set (was made by International Radio Telegraph Co.), same as CE 859 with Simon gaps CE-861 1 kW, ca. 1918 used on minesweepers, for 120 VDC drive, consists of: Wave Changer---------------------CE 862 Switchboard----------------------CE 863 Quenched gap---------------------CE 864 Assembed unit for gap------------CE 865 Gasket---------------------------CE 875 Gap holder-----------------------CE 866 Hand Key-------------------------CE 867 Send-rec switch------------------CE 868 Condenser------------------------CD 158 Protective device----------------CD 53 Motor Generator------------------CB 232 Transformer----------------------CE 889 CE-869 1/2 KW Panel type quenched gap transmitter for 80 VDC supply consisting of: Quenched gap holder---------------CE 607 Gap Units-------------------------CE 829 Wave changer, oscillation transformer and loading coil---CE 860 Hand key--------------------------CE 611 Condenser-------------------------CD 158 Protective device-----------------CD 156 Motor generator-------------------CB 235 Transformer-----------------------CE 612 Send Rec Switch-------------------CE 613 CE-1221 1 KW, 1918 315-1000 kc 6 frequencies for use on submarine chasers consists of: Panel transmitter----------------SE 1222 Wave changer---------------------CE 862 Gap holder-----------------------SE 312 Gap units------------------------SE 1001 Gap gasket compression-----------SE 1003 Gas gasket bolt------------------SE 1004 Condenser------------------------CD 158A Protective device----------------CD 53 Motor generator------------------CB 232 Transformer----------------------CE 889 Key------------------------------CE 867 Antenna transfer switch----------CE 868 Switchboard----------------------CE 853 Reactance------------------------CD 1234 CE 1222 Panel transmitter for 1 KW transmitter CD 1221 above consists of: Wave chanager-------------------CE 862 Gap holder----------------------SE 312 Transformer---------------------SE 889 Switchboard---------------------CE 862 |
| Slaby Arco | 1902 | Germany |
Straight Gap sets, then later as Telefunken (see below) |
| Societe Francaise Radioelectrique | 1910 | Surennes & Belfort France | Perhaps along with others (CGR, Ducretet?), SFR made the Gueritot type transmitter.
The Gueritot was an early airplane 50 watt spark transmitter (powered by 10 VDC) with an
integrated key. Known from picture and schematic.
The key and vibrator were apparently in one unit.
SFR was a dominant force in the French wireless industry and built early spark sets for
automobiles, pack sets for mules, wagons,
and men to carry,
and airplane sets. SFR made a rotary gap,
a 50 KW set (1918),
and a 10 KW set (blower cooled gap) among many others. 500 watt quenched gap SFR rig
for seaplanes.
See "Vingt-Cinq Annees de T.S.F.", published by the S.F.R. in 1935. French War Ministry bulletin No. 19 (January 1918) lists the following summary of spark stations, probably most made by SFR/CGR: Portable Stations: Portable Station No.1 P.P.1 50 watts Portable Station No.4 P.P.4 (1917) & P.P.4A (1918) 40 watts Portable Station No.5 P.P.5 Pack Mule Stations: 500 watt station Station L (Type CGR) 2 KW station Station RR Stations on horse-drawn carts: 2 KW station on 2 wheel cart Automobile stations: 2 car automobile station Radio-Air Stations: Type K rotary gap 120 watts Type U rotary gap 140 watts Type Y rotary gap Ensemble d'Emission L6 -- station intended to transition from damped to continuous waves Type S transmitter 500 watts weight 44 kilograms |
| Societe des Telegraphes Multiplex | 1910 | France | STM joined SFR about 1910. STM was the maker of the "Magunna" military transmitters & receivers before and during W.W.I. The 100 watt "Magunna" pack set included an oil break key on a wooden base. STM also made the 50 watt and 800 watt Magunna transmitters. (Pictures from "Radio- électricité" Tome 1 N° 7 -December 1920"). Schematic diagrams exist for the 100-200 watt sets and the 400-800 watt sets. By 1920, STM (E. Mercadier & H. Magunna system) was advertising tube equipment. |
| Sperry Gyroscope Company | 1916 | New York |
1/2 KW "aeroplane" set with aerial and reel (1916) CS 103 1/2 KW Motor Boat Set consisting of: Transmitter----------------CS 526 Spark Gap------------------CP 337 Power Unit-----------------CO 127 Exciter Generator----------CB 214 Receiver-------------------CS 107 Wave Changer/Loading Coil--CS 490 Condenser------------------CD 54 or CD 158 Relay Key------------------CS 491 Send/Receive Switch--------CS 492 Wave Meter-----------------CAG 519 CS 814 1/2 KW set, impact type, same as CS 103 except for power unit CB 811 CS 1044 buzzer transmitter 50W on 126 meters CS 350 1/2 KW aeroplane set with aerial and reel consisting of: Spark Gap------------------CS 493 Relay Key------------------CS 491 Generator------------------CS 495 Fan drive------------------CS 496 Reel-----------------------CS 497 CS 351 75 watt transmitter with CS 498 spark gap CS 494 200 watt auxiliary set, vibrating gap, motor-generator supply, 6 volts |
| Stone Telegraph & Telephone Co. | 1902 | Maine and Boston, MA | Early pioneer. Stone system used an oscillation transformer whose primary and secondary were both variable. Spark transmitter installed on USRC Manning 1907 by GH Clark consisting of: 2 KW open spark gap 120 cycle generator glass plate condenser Gap: lower element is tube with lip on top; top element in conical; air blows through lower electrode Oscillation transformer for loose coupling Stone set at Boston Navy Yard, 3 KW, six 3/4" brass ball spark gap Detailed description of Stone system in "Electrical World and Engineer" of July 8, 1905. 3KW sets with 8 brass ball spark gap and rear contact key installed on Georgia, Nebraska, California, South Dakota, St.Louis, Milwaukee 1906 Multiple spark gap set for Navy 1904 |
| Teishinsho system | ca 1919 | Japan |
Teppun or Koseki detectors in receiver |
| Telefunken | 1903 | Germany |
Standard Ship Stations (see "Textbook on Wireless Telegraphy" by Rupert Stanley, 1914): 0.2 KW Small Ship Station (Panel Set) Quenched Gap Type A 400 watt induction coil set for ships Type B 400 watt ship station with motor driven alternator Type C 1 KW alternator driven ship station Type D 1.5 KW Standard Ship Station 500 cycles Type E 5 KW alternator driven ship or land station Telefunken 5 & 10 KW sets bid in 1911 on US Navy Schedule 2571 From 1919 company brochure: Type G-Fuk 16 Type G-Fuk 16a Type G-Fuk 17 Cart Station Type G-Fuk 18 Cart Station Type A K S 58 1/2 KW Navy Landing Set 0.4 KW Pack saddle wireless station Bicycle generator for operation of portable wireless telegraph sets Type 17 0.5 KW Battle outfit Type 16 0.5 KW Low Power Automobile Set Type 17 1.5 KW High power set in automobile freight-carriage Type 14b, 15b, and 16a High Power Stations (Cart Stations) 0.5 TK transmitting set for medium sized passenger boats and land stations "Debeg" Trunk Station 0.5 KW in large trunk suitable for narrow cabins on ships 1.5 TK quenched gap set for medium sized and large ocean liners 2.5 TK quenched gap set for medium sized ship and land stations 5 TK for large ship and land stations 7.5 TK 10 TK 15 TK 25 TK 35 TK 0.4 TV auxiliary station originally developed as airplane set, adapted to shipboard use 0.5 TV quenched gap set designed for small submarine use 1 TV for submarines 2 TV for small cruisers 2.5 TV 4 TV for large cruisers and landstations 10 TV for large battle cruisers, shore and landstations Airplane and Airship stations in 1919 brochure: Type AFS 35 Three fixed wavelengths, for medium sized airplanes, does not contain receiving device D4 Sender & Receiver for medium sized airplanes, the same transmitter with different output and wavelength is designated D1, D2 and D3 G Type Transmitter & Receiver, for large airplanes N Type Transmitter & Receiver, for airplanes-- contains audion in receiver R Type Transmitter & Receiver, for giant airplanes Type ALS 49 for Airships (dirigibles) Demonstration sets for wireless schools High Power Installations: For Example, Nauen: 500 KW Wide range of portable station configurations: 0.03 KW TBK station for balloons 0.04 KW TPK "Tornisterstation" (backpack set) 0.1 KW TAeK airplane transmitter 0.1 KW TMK light motor airship station 0.3 KW TMK heavy motor airship station 0.2 KW TK airship station 0.3 KW TPK saddle pack set station 0.3 KW TLK beach landing station 0.5 KW TFK light auto field station 0.5 KW TAK light automobile station 1.5 KW TAK automobile field station 1.5 KW TFK heavy motor field station 2.5 KW TAK heavy automobile field station smaller induction set lower power stations, and high power 15 KW and over fixed land stations |
| United Wireless | 1906-1912 | New York and Seattle |
Pack set-- unsuccessfully marketed to U.S. Navy Dozens of shore stations and ships equipped with United Wireless transmitters Open gap ship's stations--Shoemaker hookup (Harry Shoemaker Chief Engineer) Signal Corps Proposal of 1910 Standard 1 & 2 KW straight gap sets 1911 |
| W D Wireless Factory | ca 1918 | Soho (London) England | W/T No.1, similar to the Conn. Tel. BC15A and therefore probably also an aircraft transmitter. |
| Western Electric Company | organized 1870s | Chicago |
CW 102 and CW 102A, 1/2 KW Motor Boat Sets, 15 in all made. Consists of: Power Unit-----------CO 127 Exciter Generator----CB 214 Receiver W.E. Co. make. CW 102A same as CW 102 except with smaller filter. Apparently these units were transitional from spark to Audion transmitters. They were quenched gap rigs fitted for Audions. |
| Winn Radio & Electric Mfg. Co. | QST ad June/1920 | Chicago, IL |
"Winn" Portable Wireless Set, "sending range 10 to 12 miles", straight gap |
| Wireless Improvement Co. (R.E.Thompson Mfg. Co.) | 1912-1926+ | New York |
1/2 KW Panel Radio Set Type 200-B-1 pack set, 1914 SE 1205 2KW quenched gap set 300-952 meters, 1918, consisting of: Hand Key------------------Type SE68A Quenched Spark Gap Unit---SE 1002 Antenna Send-Rec switch---SE 165 Lightning Switch----------SE 163 Made the CE 606B 1/2 KW transmitting set for 120VDC drive (1918), therefore probably also made the CE 606 and the CE 606A 1/2 KW Panel transmitters-- CE 606 1/2 KW Panel Type Transmitting Set consisting of: Quenched gap complete----------CE 607 Plate units for gap------------CE 608 Gaskets for gap----------------CE 609 Wave changer, oscillation transformer, and loading coil----CE 610 Hand Key-----------------------CE 611 Condenser----------------------CE 158 Protective Device--------------CD 156 Motor Generator----------------CB 233 Transformer--------------------CE 612 send Rec Switch----------------CE 613 CE 606A same as SE 606 except for motor generator |
| Wireless Specialty Apparatus Company (Col. John Firth) | 1907-1919 | Boston, MA |
Type No. 250-C-15 Field Radio Pack Set, 1914. 250 watt Radio Pack-Equipment Type Q-S-250 250-S-1 250W Panel transmitter CR-654 1/2 KW quenched gap transmitting set panel type with Dubilier condensers consisting of: Quenched gap------------------CR 619 Gap units---------------------CR 620 Gaskets-----------------------CR 623 Wave change & Osc. Trans.-----CR 624 Hand Key----------------------CR 675 Protective Device-------------CD 156 Condenser---------------------CD 158 Motor generator---------------CB 233 Transformer-------------------CR 677 Send-rec switch---------------CR 678 Loading coils-----------------CR 754 CR-654A 1/2 KW panel type quenched gap transmitting set with WSA Co. condenser and Holzer Cabot motor generator & 6 frequencies for use on subs and tugs consisting of: Quenched gap------------------CR 619 Gap units---------------------CR 620 Gaskets-----------------------CR 623 Wave change & Osc. Trans.-----CR 624 Hand Key----------------------CR 675 Protective device-------------CR 676 Condenser---------------------CR 204 Motor Generator---------------CAJ 598 Transformer-------------------CR 677 Send-rec switch---------------CR 678 Loading coils-----------------CR 754 CR-655 2 KW transmitting set with battery charging panel consisting of: Wave Changer------------------SE 108 Loading coil------------------SE 109 Switchboard-------------------CR 680 Tone Tester-------------------SE 84 Quenched gap------------------CR 679 Gap Units---------------------CR 685 Gap gaskets-------------------CR 586 Nonsynchronous gap------------SE 64 Hand Key----------------------CR 681 Relay Key---------------------CR 682 Condenser---------------------CR 204 Protective Device-------------CR 676 Motor generator---------------CAJ 600 Transformer-------------------CR 683 Ant send-rec switch-----------CR 684 Lightning Switch--------------SE 163 CR-655A 2 KW transmitter with battery charging panel and Holzer Cabot motor generator, 120VDC drive CR-932 Emergency Radio Transmitter 200 watts Quenched gap CR-1125 95-1000 kc 9 frequencies for battleships, destroyers, tenders and auxiliaries 5 KW set consists of: Switchboard-----------------SE 80B Motor generator-------------CB 223 Transformer-----------------CR 1183 Spark gap holder------------CM 404 Spark gap unit--------------SE 1105 Spark gap gasket------------SE 1106 Spark gap bolt--------------SE 1107 Condenser-------------------CD 158A Wave changer----------------SE 719A Antenna load coil-----------SE 88 Hand Key--------------------SE 68A Relay Key-------------------SE 137B Tone tester-----------------SE 84 Send-rec switch-------------SE 165 Rotary gap------------------SE 64 CR-1125A same as CR-1125 except condenser SE 840 & Rotary gap SE 911 CR-1126 Navy version of Type Q-S-A-500, the 1/2 KW Quenched Gap transmitter. Submarine chasers. Consists of: Motor generator--------------CAJ 598 Transformer------------------CR 677 Quenched gap holder----------SE 1197 Quenched gap unit------------SE 908 Quenched gap gasket (compression)---SE 909 Quenched gap gasket (bolt)---SE 961 Protective device------------CR 676 Antenna send-rec switch------CR 678 Wave changer-----------------CR 1195 Antenna load coil------------CR 754 Hand Key---------------------SE 653 Condenser--------------------CR 840 CR 1127 1/2 KW transmitter consists of: Motor generator--------------CAJ 595 Transformer------------------CR 677 Gap holder-------------------CR 619 Protective device------------CR 676 Gap units--------------------CR 621 Gaskets gap------------------CR 623 Wave changer-----------------CR 624 Antenna load coil------------CR 754 Condenser--------------------CR 840 Hand Key---------------------CR 675 200 watt Emergency Transmitter, Type Q-S-200 Quenched Gap Special 1/4 KW Panel Transmitter Quenched Gap 1/2 KW Transmitter, Type Q-S-500 Quenched Gap 1/2 KW Transmitter, Type Q-S-A-500 Quenched Gap 1 KW Panel Transmitter 1 KW Panel Type "C" transmitter (1914) 2 KW Transmitter, Type Q-S-2000 5 KW Transmitter, Type Q-S-5000 5 KW Transmitter, Panel Type "C" |
| Worts-McKisson Mfg. Co.-- started by 2 high school students of more than modest means | 1910-1913 | Toledo, Ohio |
The "W-M" 1/2 KW Complete Set (straight gap) The "W-M" 1 KW Complete Set |
