[TenTec] Inrad 762

[Toby Pennington]

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 at aol.com>
To: <tentec at 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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