[1000mp] SUB RECEIVER FILTER WANTED

[Ian White, G3SEK]

Joe Subich, K4IK wrote:
>
>
>> Should i be looking for a YF-115c filter.?
>> and if so can someone share with me if its really worth the
>> time and money.
>
>I would not use the Yaesu (or INRAD) 500 Hz Collins
>filter.  While it is better than the ceramic SSB filter,
>it is much too sloppy - nearly 600 Hz with a shape factor
>of 2.6:1.
>
>> As at present the lack of filter in the sub receiver leaves
>> it as wide as a barn door
>
>My preference would be the INRAD 721-C a 500 Hz crystal
>filter with a shape factor about 1.7:1.  Some folks are
>using the INRAD 703-C 400 Hz crystal filter but I think
>it's a bit narrow for the subreceiver.

We were here about two weeks ago!

Almost everyone who's tried both will agree that the INRAD filters are 
*much* better in the sub-RX, because all your skirt selectivity has to 
come from that one filter.

If you're using the sub-RX mainly for scanning split pileups, you may 
prefer the 500Hz INRAD filter. If you're trying to use the sub-RX as a 
real receiver for making QSOs, you may prefer the 400Hz option.


-- 
73 from Ian G3SEK