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June 9th 10, 03:04 PM
posted to rec.radio.amateur.boatanchors
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HW-29 and HW-29A
"Northe" wrote in message ... Thermion wrote: Can anyone please explain the difference(s) if any, between the two Heathkit "Sixer" models HW-29 and HW-29A? The HW-29A used 8-MHz crystals for the transmitter, and multiplied the oscillator frequency by 6 (so that 8.333 MHz crystals transmitted on 50 MHz) -- the 8 MHz crystals were readily available surplus at that time. The earlier HW-29 which came out around 1960 used more-expensive _overtone_ crystals -- in which the crystal was actually made to operate at a multiple of it's basic frequency. Since the 8 MHz FT-243 crystals were so cheap, many, if not all, the HW-29s were modified to take them, and Heath quickly figured it out. Northe N6KO Many thanks! |
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