[R-390] Mech Filters/Ohm Reading

[Cecil Acuff]

Should have read on down....

I hate it when that happens...

Good news though!

Cecil...
----- Original Message ----- 
From: "John KA1XC" <tetrode at comcast.net>
To: "R-390 reflector" <r-390 at mailman.qth.net>
Sent: Saturday, April 16, 2005 12:52 AM
Subject: Re: [R-390] Mech Filters/Ohm Reading


> 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
>
>
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