[R-390] Mech Filters/Ohm Reading

[John KA1XC]

You can sleep easy Jon, it's supposed to be like that.

Two sections of bandwidth switches S502/S503 select the filter used while
the other two sections short out the 3 filters not in use to prevent
unwanted signal leakage through them. The IF bandwidth was in the 4 KC
position when you took your measurements.

73,
John


> Hello,
>
> I'm wondering if anyone can answer a question for me. I'm basically going
> over the IF Deck, which is out of the radio and at this point.  I'm taking
> some ohm readings at J512 and everything checks out. Great. Now I took the
> cover off the Mech filters and looking across the terminals expected about
> 40ohms according to the book. However I'm reading 0ohms across 3 out of
the
> 4 filters. I'm getting nervous at this point. The 4th filter (4K) does
> actually read 41 ohms. Another data point is that I lifted the cap off one
> terminal of a filter that reads 0ohms and also took the wire off it. It
> turns out that with the wire off I'm reading about 58 ohms with or without
> the cap.  I'm going to bed now and saying a little pray. I guess I'm
looking
> for some help from the group. I'm preparing myself for the worst.
> Thanks in advance,
> Jon, KB1DC