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...
From: Bill Cook <firstname.lastname@example.org>
To: Greg Hodsdon <email@example.com>; firstname.lastname@example.org
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
>INRAD filters is the center frequency accuracy and the much better symmetry
>the stock filters. Less ripple too.
>INRAD telephone is: 541 459 5623
>FAQ on WWW: http://www.contesting.com/tentecfaq.htm
>Administrative requests: tentec-REQUEST@contesting.com
FAQ on WWW: http://www.contesting.com/tentecfaq.htm
Administrative requests: tentec-REQUEST@contesting.com