Bill,
My only concern with a 10-pole filter in the 9 MHz slot is that the CW
transmit BFO frequency of 9,000.400 kHz *must* fall within the flat and
linear portion of the lower filter skirt. If this frequency is anywhere
near the knee of a 10-pole filter, I guarantee that the transmitted CW
waveform and note will fall apart.
I would suggest to George that these sample five filters be thoroughly swept
and their linearity tested at the above frequency. Just a thought...
-Paul, W9AC
-----Original Message-----
From: Bill Cook <wdcook@ibm.net>
To: Greg Hodsdon <k7kj@teleport.com>; tentec@contesting.com
<tentec@contesting.com>
To: <tentec@contesting.com>
Date: Monday, December 28, 1998 9:18 AM
Subject: [TenTec] Re: 2.4khz 9mhz pri INRAD Filters
>
>
>
>George at INRAD will make a special order of 10pole, yes 10pole, 2.4khz
>wide 9.0015mhz center frequency drop-in primary filters if we have enough
>people call him and place an order. These will cost more than the 8pole at
>$110.00. How much more is unknown(maybe in the $130.00 area). With a
>minimum of 5 orders he did say they would be made! The good thing about
the
>INRAD filters is the center frequency accuracy and the much better symmetry
>than
>the stock filters. Less ripple too.
>
>INRAD telephone is: 541 459 5623
>
>Bill N4WC
>
>
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>
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