I spent some more
time with the R-4A last night. I carefully sprayed
DeOxit into the AF & RF gain pots, and the wafer switches; esp the
IF bandwidth switch. The rig does work better now. Things are better
now.
Unfortunately, the
IF bandwidth issue is still there. A signal that is S9 in the 3 widest
positions drops to about S5 or lower in the .4 position, even when I
correct the pass band tuning to peak the signal. Any ideas of what the
cause may be? I'm assuming bad caps in the LC IF filter but looking at the
jumble of parts around the IF bandwidth wafer switch, I'm not thrilled about
trying to replace them.
- Keith KD1E
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