[Elecraft] SV: Getting Ready For The 2nd RX

[Bob Tellefsen]

Now I'm curious.
When I installed my 400 Hz filter, it had no
offset info on it.  Is this normal?
73, Bob N6WG
K3 #811

----- Original Message ----- 
From: "Gary Hembree" <HEMBREE at asu.edu>
To: "elecraft" <elecraft at mailman.qth.net>
Sent: Wednesday, May 28, 2008 10:52 AM
Subject: Re: [Elecraft] SV: Getting Ready For The 2nd RX


On Wed, May 28, 2008 at 11:49 AM, Bill Tippett <btippett at
alum.mit.edu> wrote:

Elecraft will eventually publish some instructions regarding 5-pole
filters for
diversity, but my understanding is that the peak variation between 500
Hz filters is a maximum of 50 Hz.  My guess is that they'll simply
tell us to split the difference on the 500s and not worry about it.
If the 200 Hz has total variation of  50 Hz, then it might require
more careful matching (since 50/210 is a significant percentage of
total BW), but I've not seen any variation numbers on the 200 yet.

Bill,
The variation in filter offsets must be larger than you think.  My
KFL3A-500 has an offset of -0.75 kHz, which is 90-100 Hz higher than
the values cited by Orin.  The offset of my KFL3A-200 is -0.95 kHz,
which oddly enough matches the offset of my KFL3A-2.7K, not that it
matters.
Thanks for the heads up on filter matching for diversity receiving.
73, Gary, N7IR
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