[TenTec] FR-4 Audio Filter

[Alan Sewell]

Dick,

I am also interested if you are able to find any information on the 
FR-4.  The only information I have seen is mention in a description of 
the S30 Signalizer, which contains an FR-4.  It simply states "...a 400 
Hz passband CW filter with adjustable attenuation."

73,

Alan  N5NA

http://www.tentecwiki.org



KnoxCol at aol.com wrote:
> Happy St. Patrick's Day Ten Tec Fans!
>  
>   I was at the Marshall, Michigan,  Amateur Radio Swap this  morning and 
> found a pristine piece of TenTec gear that I had not seen  before.  It is an FR-4 
> Audio Filter.   I believe this goes  with the PM series of radios.  Can anyone 
> in the group provide information  on it and what it's worth might be?   
> Thanks and 73!  de  KD4BRL    Dick O'Knox
>
>
>