[R-390] 4kc filter

[Jon Schlegel]

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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