Perera Telegraph MuseumTelegraph Lore by Greg Raven
Antique Wireless AssociationK3WWP CW Page
Tim Patton's CollectionW1FJI Telegraph Museum
John Casale's Telegraph HistoryKT5X's Key Collection
Morsemad by John SnellWhiterook Products
Western Historic Radio MuseumGoodwilly Collectables
Smithsonian InstituteNew Wireless Pioneers
New England Steam and WirelessNJ Antique Radio Club
Pennsylvania RailroadWestern Electric
JH Bunnell and Co.The Vibroplex Company
KA2MGE's Telegraph Museum 1860's Military Telegraph
N0UF's Key CollectionPete Malvasi Collection
Boy Scouts of AmericaSubmarine Cables
N7CFO KeyletterMorse Code Heaven
Cable and WirelessRadiant Gemstones
Randy Cole's Vibroplex pageAustralian Telegraph Page
Neal McEwen's Telegraph OfficeF5SWN's Page
Lionel TrainsFons Vanden Berghen's Collection
History of the Atlantic CableTom French's Artifax Books
IK6BAK Key CollectionMorse Enthusiasts Group Scotland


When two notes or signals of the same amplitude and close in frequency are mixed, whether tuning a guitar or in a receiver, a repetitive pattern emerges called the beat frequency. It is the result of the combination of the two waveforms. The phenomenon of beats produces a throbbing or pulsating tone when the notes are in the audible range. In other words, the two sounds mix together periodically to produce silence! If you click and drag the black rectangle in the bar above slowly to the right to mimic the passage of a fraction of a second, you will be able to see the beats form and move by as nearly flat areas of the curve.

RingSurf Amateur Radio World Ring Owned by
Sparks Telegraph Key Review
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Use this program to calculate the length of a dipole!
You may use the slide bar to change frequency, or
Click the arrow to change frequency by one, or
Click the space between the bar and the
arrow to change by 10 kc interval

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