[R-390] capacitor analysis

[John Saeger]

David Wise wrote:

> By the way, there's a typo on that page that could confuse
> your understanding of C501's role.

Actually I was looking at TM 11-856A page 59, but I hadn't really understood
what it said.  I didn't understand that C501 was basically out of the
picture when using the narrow bandwidths.

> I seem to remember someone on this list finding that
> his L503 was open.  It seems to me that that would
> degrade 1KC/0.1KC performance.
>
> I can't remember when I last saw a bad ceramic cap.

I suppose it's possible that either C520 or L503 are out of adjustment.  And
when I look at C520, it looks like the place where the screwdriver goes has
broken off.  So maybe C520 doesn't work anymore.

Well I have plenty to do.  On the bright side, the intermittant fading seems
to happen less and less often the more I use the receiver.  Or so it would
seem.  Sometimes it's hard to tell with an intermittant problem.  I suppose
it could also be a flakey contact somewhere.  I haven't done any cleaning
with De-oxit yet.  But I think I'll give it some more time to see if it
works itself out before spraying things.  I've had some bad experiences with
contact cleaner.  Then I'll probably try to align the thing and I'll get
into the narrow bandwidth problem then.

Thanks,

John