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

[Gary Hembree]

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