I'm going back together with the first of four Century 21's here. First
off, is it me, or are the set screws in the main tuning knobs really
tiny? Such that the threads in the knob are excruciatingly fragile? I
haven't got one out of the four that will tighten enough to stay secured
to the PTO shaft. A couple of the screws can be pushed right through.
Any thoughts on a simple fix for my simple mind?
Second, and more serious. I had one up and running yesterday on 20
meters. Seemed to have good sensitivity, maybe even above average. So
I plugged in the matching calibrator which put in a deafening
signal...for awhile. As I tuned to zero-beat the audio quit completely.
After monkeying around with it for about twenty minutes without plan, I
switched the selectivity control from narrow to the middle position and
pop, the audio came back. On all three bandwidths.
So I turned the RF and AF controls way down, turned the calibrator back
on and started increasing the gain. Like an idiot, I can't remember
which one, maybe both - arrgh! The calibrator had plenty of signal all
the way to the top of ten meters.
But as I continued to increase gain, poof. No audio again. It wasn't
near maximum gain either. And this time it hasn't come back.
What would cause this behavior? And any ideas where I should start my
trouble-shooting? Being primarily a boat-anchor man, I can use all the
help I can get.
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