Buck and Duane, Thanks for your input on the 762 filter. My 762 arrived a
couple of days ago and I am waiting until I can make up my mind about what
to with the 500HZ and 250HZ filters. Do I want to leave them in and just
disengage them or pull them both out? Any thoughts about this? Toby
W4CAK
----- Original Message -----
From: <K4IA@aol.com>
To: <tentec@contesting.com>
Sent: Saturday, August 14, 2004 10:53 AM
Subject: Re: [TenTec] Inrad 762
> Toby
>
> My 762 arrived yesterday so I haven't had a chance to play with it but
the
> theory is:
>
> 1. The 1khz filter doesn't kick in until the DSP is below 750hz anyway
> (when the XTAL Filter Menu is set to AUTO) so it useless down to 750 as
it
> doesn't "do anything" until you get there.
>
> 2. The 500hz filter has a pre-amp to make up for its insertion loss and
> that pre-amp has caused some IMD problems. The insertion loss of the
600hz
> INRAD filter is not enough to need a pre-amp. I suspect this is because
the
> INRAD is a 4 pole filter and the TenTec is 6 pole.
>
> So by inserting the 600hz into the 1khz slot, you avoid the IMD problem
and
> don't lose anything in the process.
>
> I am sure others on the list will offer far more technical reasons but
that
> is what my simple mind has distilled from the previous discussions.
>
> Radio k4ia
> "Buck"
> Fredericksburg, Virginia USA
>
>
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