[TenTec] 3.1 KHz IF Filter for 2nd IF in Omni 6

[Mark S. Holden]

On 1/9/2016 8:32 PM, Gary J FollettDukes HiFi wrote:
> I have a 3.1 KHz bandwidth filter in one of my Omni 6+ radios. It fits perfectly into the TenTec socket and was obviously made for the en Tec. However, it looks unlike any filter I havee ever seen in ANY Ten Tec product.
>
> It is an 8 pole filter but it also had four small IF transformers on it, presumably to tailor the passband shape.
>
> Has anyone heard of this filter? Does any know who made it? It is too perfect to have been a home brew job. It is built on thicker board stock than that used for most Ten Tec filters.
>
> I would assume that its intent is to improve received audio in SSB. I am going to try it in a few minutes to see what the radio sounds like compared with the others.
>
> Gary
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>
I'd expect that to be a fun filter for rag chewing.

My Harris RF-550 rx has a 3.24khz crystal filter that's incredible for 
SWL.  I also installed some crystal filters intended for the Racal 
6790gm in my AOR 7030+