Hi. A friend of mine brought me his President Lincoln for tune and some mods.
I noticed, that when I set bias currents for driver and final max power I could get on dummy load was 18W AM/FM (nothing strange) and 20W SSB measured on PEP meter I trust. All similar radios I had before could easily go up to 40W SSB.
I noticed also ALC pot is working strange. At the minimum position I have some kind of (how to name it) squealing looks like feedback of the mic with RF with 20W oputput power, after going with the pot clockwise it disapperas, power output is low and moving forward clockwise power is going up to 20W in the middle position of the ALC pot, than to the end output power is not changing.
Anyone has an idea what can be wrong with this radio? 4W/12W is not bad and enough but I want to know what could be the reason that this radio can do only 20W SSB with original driver and final.
Mike
I noticed, that when I set bias currents for driver and final max power I could get on dummy load was 18W AM/FM (nothing strange) and 20W SSB measured on PEP meter I trust. All similar radios I had before could easily go up to 40W SSB.
I noticed also ALC pot is working strange. At the minimum position I have some kind of (how to name it) squealing looks like feedback of the mic with RF with 20W oputput power, after going with the pot clockwise it disapperas, power output is low and moving forward clockwise power is going up to 20W in the middle position of the ALC pot, than to the end output power is not changing.
Anyone has an idea what can be wrong with this radio? 4W/12W is not bad and enough but I want to know what could be the reason that this radio can do only 20W SSB with original driver and final.
Mike