HF DSB walkie talkie
This is a very simple HF DSB walkie
talkie. I wanted to make a bare bones simple transceiver to communicate
with a 10m SSB handheld, so I designed this one. Two identical DSB
transceivers can only communicate in AM mode, not DSB. You use DSB to
communicate with SSB transceivers only.
Switching from TX to RX mode is done by switching the power to the
appropriate sections (TX, RX) using a switch (not shown in the
schematic). The local oscillator is powered on both the RX and TX. The
transceiver requires 9v and the current consumption is 20mA at no audio
signal on RX and 90mA on TX.
The transceiver kind of worked, I could transmit and receive ok from
40m all the way up to 10m with appropriate crystals. The AM mode did
not work very well but this was an interesting experiment which has
potential for improvements.
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