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Re: [TenTec] TenTec vs. INRAD Filters - who's design/package is best?

To: tentec@contesting.com
Subject: Re: [TenTec] TenTec vs. INRAD Filters - who's design/package is best?
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 02 Dec 2010 16:55:08 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
More likely selected crystals because the ladder filter often needs 
slightly different frequencies to get the desired response curve. The 
crystal maker may have marked them the same, while Tentec sorted them 
and marked them with the detailed frequency, like as a color coded stripe.

I've not had an Inrad filter for Tentec. One of the great properties of 
the Tentec ladder filters is that they don't ring from lightning pulses 
or ignition noise. I know an Inrad CW filter I had in a Kenwood years 
ago would ring on CW at 35 wpm or faster. I don't know about their 
designs for Tentec. I'd put up with leakage to keep away from filter 
ringing in the real world of HF static.

73, Jerry, K0CQ

On 12/2/2010 4:23 PM, Don Jones wrote:
> OK, so I am looking at the OEM TenTec Filters in my Omni 6 and they are
> matched crystals (I assume) on a piece of G10 circuit board material.
> I look at the INRAD filters and they are inside a nice Faraday cage (metal
> can).
> My question is simple with cross-talk in mind, are the metal can filters a
> better design? And more importantly, is there a measureable difference in
> performance?
> Don Jones KO7i
> Arlington, WA
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