Re: {Collins} 75A-4 Filter Adjustment?



Some additional info.. although both filters are marked F 455J 31,  the "hotter" filter is P/N 522-9089-002 while the other less sensitive filter is marked as shown in the 75A-4 manual as 526-9089-00.  Maybe the more sensitive filter is for a different Collins radio? 73 john
 > From: jstarr001@xxxxxxxxxxx
> To: collins@xxxxxxxxxxxxx
> Date: Tue, 28 Feb 2012 14:28:55 -0500
> Subject: {Collins} 75A-4 Filter Adjustment?
> 
> 
> Hi Listmates,
>  
> I have two 3.1 kc J filters for the 75A-series.  With an external RF 50uV source (elecraft 20-40-80m calibrator), one of the 3.1Kc filters provides 10db more S meter reading than the other on each of the bands.  Without the RF source, the signal and background noise of a S-7 SSB signal also seems noticeably "brighter" on the one filter.  Is this difference intrinsic to the filters or is a re-alignment needed?  Is re-alignment likely to make them behave more similarly?
>  
> 73 
>  
> john
> 
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