Wayne, as you know from my private correspondence, I think the variable
filters are the best way to go on this, as there are just not enough
slots to get to an adequate level of protection for anyone who uses a
lot of modes. Another example of thinking outside the box. I LOVE the
use of the term "tracking filter", BTW. You should use that term in all
future references to the new filters. Any idea when they might be available?
73,
Larry N8LP
Date: Mon, 12 May 2008 19:36:16 -0700
From: wayne burdick <[EMAIL PROTECTED]>
Subject: [Elecraft] Re: AGC Design of the K3
To: Shane White <[EMAIL PROTECTED]>
Cc: [email protected]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=US-ASCII; format=flowed
The K3 selects a filter based on the user's WIDTH setting, which
usually varies with the mode of operation. Typically you might select
50 Hz to 1000 Hz WIDTH while using CW mode. We offer several crystal
filters in this range (200, 250, 400, 500, and 1000), and if you have
more than one installed, the K3 will select the optimal one
automatically.
The idea of a variable-passband crystal filter is that it could replace
two or more fixed-bandwidth filters. For example, if we made one with a
BW of about 200-500 Hz, it could replace up to four crystal filters (in
practice, it would be replacing two or three at most). This would free
up one or two slots for other fixed- or variable-bandwidth SSB filters.
Since this variable-passband filter has 8 steps of bandwidth, we can
optimize automatically it to be equal to or just a bit higher than the
selected DSP bandwidth (i.e., the WIDTH control setting). So you could
think of them as "DSP-tracking crystal filters."
Wayne
N6KR
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