Got to one of the sites today, and it was still cold and not transmitting. I carefully applied heat from a trouble light to various sections of the transmitter while noting power output behavior.
I believe I may have narrowed it down to the oscillator section, specifically the oscillator transistor. While carefully touching my warmed-on-a-lamp finger to the transistor, the output consistently moved to normal. I have the box on my bench now, and working on a mod to keep the oscillator active while keying another stage, perhaps the following buffer. I will have to see if there is objectionable leakage, and otherwise make sure it still works normally. I will keep you informed on how this works out. I have not witnessed low audio with cold temps as you have. Laryn K8TVZ --- In [email protected], "kf0m" <[EMAIL PROTECTED]> wrote: > > We have two ExecII mobiles in the same set up 2 mtr Rx 70cm Tx. One of them > will quit working when it gets cold. I have seen both low Tx audio and low > power output until it warms up. I haven't been able to be at the site when > it isn't working to try and figure anything out. > > John Lock > kf0m at arrl.net
