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Re: [TowerTalk] Topband: Filters for Detector

To: "Wolfert, William R." <>
Subject: Re: [TowerTalk] Topband: Filters for Detector
From: "Richard (Rick) Karlquist" <>
Date: Sat, 20 Jun 2009 11:46:00 -0700
List-post: <">>
Wolfert, William R. wrote:

> resistor across the scope end is eluding me. I'm sure there's a
> down-and-dirty easy way to accomplish this. But how?

A BNC tee and a termination?  There are also dedicated
50 ohm feedthru terminations for scopes.

> #2 I'm building the W1MK detector (LBDX Ch. 11, pg. 26) and am including
> the antennascope (6 dB Hybrid) on the same board. I also thought to just
> build a BCB reject filter and PB filter into the same box. Less to carry
> to the site is good, right? Since there's 2 channels, filters for each
> channel would be indicated. For simplicity, a rotary switch to select

The gotcha here is that the filters would have to be matched, or
they will decrease the accuracy.  Matching high selectivity BCB
filters is a tall order, and no one sells matched sets.

Rick N6RK

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