K7BDY - Martin Heiman

Oro Valley, AZ


{{ On Feb. 24, 2011, Martin became a Silent Key }}


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3-minute Video by David, W6PSS made in early 1990's at Martin's ranch near Show Low, AZ
Martin is showing David the Gates BC-250GY ex-broadcast transmitter
he uses on 160 meters



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4-minute Video that continues the tour of the Gates BC-250GY transmitter
on the inside, showing the vacuum tubes and circuitry used to
generate the plate-modulated, 250-watt carrier wave.



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4.5-minute Video of Martin, K7BDY, showing David, W6PSS, his 900-foot-long
Beverage receiving antenna aimed at Southern California.




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Some pictures of Martin at the 2009 Sierra Vista Hamfest from Wally, KB7GAI



Martin with Leo, W7JPI

Martin with Jim, K7EWE on left and Roy, KB7JPL on right. 


Some pictures of Martin's Tucson QTH circa 2008




    

 


The AM Voice of K7BDY from Oro Valley/Tucson - the well-maintained BC-610I.

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The AM operating position - essential functionality on a desktop: Kenwood R-599 Receiver, Speech Amp for BC-610, Heath VFO for clean stability and Heath Wattmeter.  Microphone is an unamplified D-104.

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Martin, K7BDY, at the AM operating position.  Shack is spacious add-on at the rear of the house.

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The SSB position contains vintage transceivers (Swan 700cx, Kenwood TS-530s),  Heath SB-1000 and HL-2200 Linear Amplifiers, and a Heath Mohican general-coverage receiver.

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SSB operation is supplemented with a Yaesu FT901 transceiver and a Henry 2K-4 Amplifier.

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A key part of the K7BDY 160-meter system is this 70-foot, series-fed vertical monopole with capacitive tophat and top-end loading coil.

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A remotely controlled, motor-driven variable inductor at the base of the vertical allows precise matching over the entire band.  It is housed in the larger, gray weatherproof box.

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The "secret sauce" in the 160-meter stew: a surplus variable inductor of unique design for antenna matching.  It winds or unwinds a flexible silver-plated strap around a ceramic form as driven by the reversible DC motor and gear train.  

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Antenna requirements for higher bands are fulfilled by a multiband 3-element beam and wire dipole atop a 60-foot tower.

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