[TenTec] termination Z

[Duane Calvin]

If we're talking the IF crystal passband filters, those are ladder filters
in Ten-Tec's, as I understand it.

	73, Duane 

Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com  




-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Paul
Kraemer
Sent: Friday, November 07, 2014 2:00 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] termination Z

Thanks
Very interesting but these are lattice filters
I just happened to think that INRAD would certainly know since they have 
designed replacements for them
Paul

-----Original Message----- 
From: g3ory at lineone.net
Sent: Friday, November 07, 2014 1:01 PM
To: tentec at contesting.com
Subject: Re: [TenTec] termination Z

Paul,

If you are really stuck here you might be able to work backwards to
find out the answer. This only applies to ladder filters but there is
an excellent design program by G3UUR on the Warrington Radio  Club
website.  I assume you know the frequency of the crystals used. Guess
from measurements on similar crystals of the same frequency (or close),
the crystal parameters such as series C, series L and the parallel C of
the holder. Run the design program and it comes up with the values of
the capacitors needed plus the terminating resistance required.  If the
capacitors used by Ten Tec are close then you are onto a winner.



If the filter is not a ladder filter then all the above is rubbish!!!



Good luck



73 Bob

G3ORY



>----Original Message----

>From: elespe at lisco.com

>Date: 07/11/2014 18:11

>To: <tentec at contesting.com>

>Subj: [TenTec] termination Z

>

>Does anyone know the proper terminating impedance for the crystal
filters utilized in OMNI VI?

>

>I have some assorted filters from both if frequencies  I would like to
evaluate

>Thanks

>

>Paul K0UYA

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>TenTec mailing list

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