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Re: [TenTec] Omni VI 1st IF Narrow CW Filter Enable?

To: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Omni VI 1st IF Narrow CW Filter Enable?
From: Richards <jruing@ameritech.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 28 Jan 2011 02:09:45 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Please forgive my novice inquiry, I'm only part way through the ARRL 
Understanding Basic Electronics book....and I hate mathematics, so it is 
slow going.

Trying to understand the schematic in your article, and looking at all 
those capacitors… Am I to understand this is a variable filter, meaning 
it covers a variable range?  I make out two transformers, but I don't 
see anything that might constitute a variable control, so I'm assuming 
this is a single level filter – i.e., one that I can put in the audio 
circuit, or take out,  but that's all I can do – you cannot shape or 
very it in any way.   It is just that all those little capacitors lined 
up at the bottom of the schematic sort of suggest you are tapping at 
different levels, but I don't see any way to control that.

Is this correct?  Thank you for your consideration.

Happy Trails.
=======================  Richards / K8JHR  =========================

On 1/28/2011 12:25 AM, Dr. Gerald N. Johnson wrote:
> I use an external speaker passive low pass filter to tone down high
> frequency howling in my receiver audio

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