I'm putting this post up, but I might
not get back to a computer for a few days.
This transmitter has quite a history - it was
working great a few months ago. I love carrier
current - it is so interesting.
This is a 3 vacuum tube transmitter from 1971.
A beautiful piece of gear. All tubes are 6AL11 compactrons.
So anyhow - there is plenty of RF out. About 6.5 watts.
Just as it should be. Operating frequency is 1020 kHz -
not a good channel -but clear here during the day.After warm up and audio is fed in -the audio is very
distorted on the radio. Only a low level can be fed in
- about 10 percent modulation.
Here's the interesting part.
The signal is receivable on 1020 (the desired channel)
and also about 1070 and 970 kHz. So something is taking
off at about 50 kHz.The crystal is smaller than what is
specified. (It was all I could get.) I would like to think that
the crystal is failing and getting unstable. I like this idea because
another crystal could come along someday. (It's a fundamental,
which is why getting one is so hard.)
This transmitter has a funny histiry of problems and fixes.
It is somewhat jury rigged.
I love the silly thing.
Anyhow, I guess you guys can ponder this, and if so, I
will respond with more info when I can.
Best Wishes,
bruce (sorry about typos gotta go)