Workshop weirdness

I have a Tait TM8110 VHF transceiver that is destined for use on packet radio. This was sold as untested but appears to work fine. However, in testing I was concerned that the bench PSU I connected it to showed a current draw of 0A. The radio was making noise and, connected to the Bird and a dummy load was generating RF. Anyway, I programmed it with the various packet frequencies, power settings and ensured the bandwidth was 12.5kHz and tried it on air. It was working fine on both tx and rx. But still 0A draw. Hmmm.

I have two identical bench supplies, Lavolta BPS-305, 30V 5A units. One has a noisy fan so I use the other. I swapped to the noisy one and it shows reasonable current draws for rx and tx. And then the noisy fan decided not be noisy any more (still working though!) so perhaps the noise from this PSU was just it sulking from being ignored.



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