[R-390] 4kc filter

[jrusgrove at comcast.net]

Jon

Been following John KC2FXE's R-390A problem 'on the air'...don't think he'll 
mind if I jump in here. The filter works but develops sufficient leakage to 
drag down the agc when the radio warms up. As it cools off the leakage 
problem goes away.

Jay W1VD


----- Original Message ----- 
From: "Jon Schlegel" <ews265 at rochester.rr.com>
To: <r-390 at mailman.qth.net>
Sent: Sunday, November 16, 2008 2:00 PM
Subject: Re: [R-390] 4kc filter


> Hi John,
>
> Welcome aboard.
>
> An easy thing to check is the filter's transducer coils.  The two isolated 
> terminals at each end of the filter connect to what amounts to the coil of 
> a small electromagnet.  The DC resistance of each coil should be around 50 
> ohms for Collins filters.  DC resistance of other manufacturers can vary 
> some.  Furthermore, there should be NO continuity from either coil to the 
> other coil or the case.  Determine this first and it will point you in the 
> right direction.
>
> Best Regards,
> Jon Schlegel  WA3MVM
>
>
>
> At 01:36 PM 11/16/2008 -0500, John L. Ahrens Sr. wrote:
>>Hello All:
>>  I'm new to this mail list.
>>  so i'm looking for replacement  4kc filter or someone that can repair 
>> them.
>>                                      Thank You All for any help
>>                                                  John kc2fxe
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