Good thinking.
----- Original Message -----
From: "geoffrey mendelson" <geoffreymendelson@gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Monday, July 26, 2010 6:11 PM
Subject: Re: [TenTec] vague answer to the triton audio filter question
>
> On Jul 27, 2010, at 12:47 AM, Mike Hyder -N4NT- wrote:
>
>> I believe when the 544 is switched to CW one stage of the filter is
>> active.
>> The second CW position uses all stages. The 544 AGC voltage is
>> derived from
>> audio. The Ten-Tec filter appears in the audio string before the AGC
>> sampling point. So to be properly effective, an added audio filter
>> needs to
>> be put into the audio circuitry before the AGC sampling. If this is
>> not
>> done, then signals outside the passband of the filter can still pump
>> up the
>> AGC voltage.
>
>
>
> That's why I suggested the MFJ filter. Although it's on or off, it's a
> tiny circuit board that is designed to go into a radio that is still
> sold. It plugs in but you could easily solder wires to it. The
> connections on it are DC, audio in, audio out and ground, which would
> probably do the job,
>
> That's also why I did not mention that IMHO just about any DSP filter,
> including the Radio Shack ones I bought in the mid 1990's would do
> better. Any external filter would be outside the AGC loop, which would
> cause pumping and false S readings from nearby signals.
>
> Geoff.
> --
> Geoffrey S. Mendelson, N3OWJ/4X1GM
> To help restaurants, as part of the "stimulus package", everyone must
> order dessert. As part of the socialized health plan, you are
> forbidden to eat it. :-)
>
>
>
>
>
>
>
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