On Apr 29, 2007, at 11:50 AM, Toby Deinhardt wrote:
The big questions are:
1) Why would I want a 8 pole file and not a 5 pole with almost the
same bandwidth? Rejection, ringing, etc. etc.?
The 8-pole filters will have somewhat sharper skirts. This could be
useful in certain QRM situations. Of course the DSP will provide
incredible ultimate attenuation -- the opposite sideband simply won't
exist, at any signal level.
2) What is the difference between the 2.7kHz and 2.8kHz -
advantage/disadvantage?
We wanted our 5-pole filter to be slightly narrower. As I mentioned
above, the 8-pole filter will have steeper skirts, at a higher price.
You can install additional filters at any time, by the way. We hope to
have variable-passband CW and SSB crystal roofing filters within a few
months, so you could save a slot or two.
3) How do the fixed bandwidth filters compare with the variable
bandwidth roofing filters?
We haven't nailed down the variable bandwidth selections, but chances
are we'll have a CW-range variable filter (maybe 300-800 Hz) and an
SSB-range variable filter (say, 1.8 to 2.5 kHz).
73,
Wayne
N6KR
---
http://www.elecraft.com
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