After finishing the IC910 mod, here is the next mini project. This may be more than just a small one.
For a very low price I purchased two low pass filters (30MHz) and a non-tested Ten-Tec PM2B, so I do expect to have some activity before it is fully functional.
This is an old CW only QRP transceiver, officially with 1 or 2W out, and with a direct conversion receiver. The rig covers the 80, 40 and 20m bands
After cleaning the AF potentiometer and some slide switches I got it to draw about 30mA from a 14V power supply. The headphone output showed some noise, variable with the pot. It looks like the headphone output is high impedance. It does use banana plugs, not even a mini jack connector. Yes, this is very old.
With an external SSB receiver I found that the local oscillator is working and can be tuned correctly.
No external signal received yet.
No transmit output detected.
Also I have no documentation, not even a circuit diagram
It does indeed look like there is more work to do with this one
Looking into the casing I was not impressed with the build quality, with long flimsy wires running around, and it looks like it has been messed up somewhat.
This might end up being a larger project, essentially building a modernized version of a direct conversion CW transceiver with a digital VFO, and maybe with additional bands. We shall see what I do with this one.
If I do a total make-over I may add some shielding to the sides of the transceiver, as they are totally non-shielded.
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