Heathkit Hw 32A Manual
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Heathkit Hw 32A Manual
When inspecting the bottom side of the circuit board I noticed another mod: a white-blue wire was attached to a white-yellow wire on the other side of the chasis by a piece of black wire. This could not be part of the original circuit, because Heathkits never had different-color wires connected together. I looked up these wires by color in the assembly manual and eventually discovered that the white-blue one carries signal 26 in the diagram above. It grounds C105 to allow voice-activated T/R switching. In my transceiver it grounded instead the white-yellow wire, which turned out to be connected to the amplifier T/R switching pin on the power connector. The white-yellow wire was supposed to get grounded during transmit by a pole of the relay. At this point I noticed that the relay in my transceiver was a DPDT one; the manual shows a 3PDT relay. There was no pole to switch the amplifier, so somebody hooked this wire up to be grounded in VOX and Tune modes. My transceiver used this switched signal to turn on the fan, not an amplifier. I left this mod in since there was no way to switch an amplifier anyway. Also, one of the terminals of the neon lamp in the VOX circuit is broken in my transceiver, so VOX is not working anyway. Not grounding poing 26 has no effect anyway.
I had one more difficulty with the transceiver. The successful tuning of the VFO frequency encouraged me to follow the rest of the tuning procedures in the manual. Some of them involved tuning the cores (called slugs in the manual) of coils and transformers. Some of them were almost stuck, but I was able to gently free them and tune them. As far as I remember, none was really off. One of them, however, was very much stuck. tried to turn the core, but at some point the stuck core caused the entire coil to turn, and this broke one of the the terminal connections (the coil was inside an aluminum shield, but I could feel that something turned and tore, and a multimeter check showed that one side of the transformer was an open circuit. Fortunately, these transformers are so large that it was easy to solder it out of the circuit board, open it up, solder the torn wire, and put everything back together. It was a good lesson in just how repairable these transceivers are.
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After I finished that project, my boss, Frank Kendrick, assigned meto write a manual on a new Heath 2-meter digital transceiver, the VF-7401. Frank advised me to use the HW-2021 service manual as a guide. I, with my vast experience of writing two service manuals, pointed out to him that while the HW-2021 manual was good, I found it lacking. I went on at great length describing in detail how I could write a better manual.
But the Allied Radio kits had very clear, step-by-step instruction manuals, where you ticked off your progress, one soldered resistor at a time. It was hard to mess the thing up, as long as you followed the instructions. It took me less than a week, as I recall, building the radio for an hour or two at a time and then taking a break. No rush. 041b061a72