(ex-K3YAZ)
TUCSON, AZ
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Arizona-AM Page
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Frank's
compact, all-mode operating position. The vintage AM transmitters
feature his well-known, twin-6146 Heathkit DX-60 (with HT-10 VFO), a
venerable Hallicrafters HT-40 and a Knight T-60. These are paired with
3 receivers, an Allied AX-190 (center), an Icom R-75 and an
Alinco DXR-8. A Kenwood TS-430 at the bottom provides SSB
capability. |
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The
almost-stock exterior of the hotrod DX-60 belies the extensive
modifications
that have turned this transmitter into a very substantial AM
rig. It now contains TWO 6146's in the final and is capable
of both controlled-carrier and conventional screen modulation.
The details of these modifications are shown below. Oh, and it
sounds great on the air with effortless, extended-range audio.
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The
inside view of the DX-60 final amplifier compartment showing the snug,
but adequate,spacing of the two 6146's. The stock plate-tank
components were able to cope with the higher power level. |
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The
"double-barrelled" 6146 modification.
Click on the diagram at right, or HERE, for a PDF file descrbing this modification and those to the power supply in increase its output to 750 volts.
Additional
modifications were done to the audio
section to enhance its operation and the allow independent
setting of the AM carrier level. (Click here
for the schematic to the Audio Modifications - PDF) |
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Frank
Cathell, W7YAZ |
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