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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 Click Here or on above image for YouTube video |
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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. Click Here or on above image for YouTube video |
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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. Click Here or on above image for YouTube video |
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Martin with Leo, W7JPI |
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Martin with Jim, K7EWE on left and Roy, KB7JPL on right. |
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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. (Click here for larger photo ~100K) {Click here for LARGEST photo ~1Meg}
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SSB
operation
is supplemented with a Yaesu FT901 transceiver and a Henry
2K-4 Amplifier. (Click here for larger photo ~100K) {Click
here
for LARGEST photo ~1Meg}
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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. (Click here for larger photo ~100K) {Click
here
for LARGEST photo ~1Meg}
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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. (Click here for larger photo ~100K) {Click
here
for LARGEST photo ~1Meg}
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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. (Click here for larger photo ~100K) {Click
here
for LARGEST photo ~1Meg}
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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. (Click here for larger photo ~100K) {Click
here
for LARGEST photo ~1Meg}
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