Re: [Drakelist] R7 Tuning Instability

Arthur, Check the 25 volt DC input from the power supply board to the VCO. If that voltage is low the VCO doesn’t have the range it needs to tune the 10 and 15 meter bands. If your power supply board is the older type with the dc to dc converter, check the core on the transformer to make sure

[Drakelist] R7 Tuning Instability

I have a Drake R7 that sometimes displays an instability on the higher frequency bands when I first turn it on. On the 21 and 28 MHz bands the frequency reads as 16xxx kHz or 32xxx kHz, and continually increases, as if the radio is slowly counting something. The lower frequency ranges act norm