Mark Mandelkern, K5AM

Ham Radio Articles

Homebrew Transceiver

A Sensitive Integrating Squelch, QST, August, 1988, 27-29. pdf
Evasive Noise Blanking, QEX, August, 1993, 3-6. pdf
A High-Performance AGC System for Homebrew Transceivers, QEX, October, 1995, 12-22. pdf
            [Corrections in QEX, Jul/Aug 2000, p.59.]
A High-Performance Homebrew Transceiver: Part 1, QEX, Mar/Apr, 1999, 16-24. pdf
            [General plan]
A High-Performance Homebrew Transceiver: Part 2, QEX, Sept/Oct, 1999, 3-8. pdf
            [IF board; notes in QEX, Nov/Dec 2000, p.60.]
A High-Performance Homebrew Transceiver: Part 3, QEX, Nov/Dec, 1999, 41-51. pdf
            [RF board; corrections, QEX Jul/Aug 2000, p.59, QEX Nov/Dec 2000, p.60.]
A High-Performance Homebrew Transceiver: Part 4, QEX, Jan/Feb, 2000, 47-56. pdf
            [AF board]
A High-Performance Homebrew Transceiver: Part 5, QEX, Mar/Apr, 2000, 23-37. pdf
            [Logic board, etc; corrections in QEX, Nov/Dec 2000, p.60.]
HF Circuits for a Homebrew Transceiver, QEX, Nov/Dec, 2001, 20-42.   photos    pdf


Amplifiers

HF+6M. 
Protecting Power Tetrodes, QST, November, 1989, 22-25. pdf
A Low-Drive, High-Power All-Band Tetrode Linear Amplifier, CQ, July, 1990, 60-65.
           
144 MHz. 
A Luxury Linear, QEX, May, 1996, 3-12.  (Photos also in QST, July 1996, p.19.) pdf
Design Notes for "A Luxury Linear" Amplifier, QEX, November, 1996, 13-20. pdf
     
Amps, misc. 
High S.W.R. Protection for Transceivers and Amplifiers, CQ, May, 1980, 63-65. pdf
ALC for Class AB1 Amplifiers, QST, July, 1986, 38-39, 47. pdf
Amplifier Cool-Down Circuits, QST, March, 1989, 35-36.
 

Misc

Overload Protecton for High Voltage Power Supplies. pdf
Antenna Relay Sequencing, Ham Radio, October, 1987, 17-26. pdf
A Homebrew Contest Station, NCJ, July/August, 1998, 12-13. link
        (Photo also in QST, February 1999, p.84.)  
An Automatic, Remote Antenna-Tuning Controller, QST, September, 1995, 46-49.
The AMSAFID: An Automatic Microphone Switcher Amplifier Filter Integrator Distributor, QST,
        November, 1995, 47-49.
The Hapirat - An Audio and Computer Control Panel, QST, Sept 2004, 28-33.
        Expanded version: pdf


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