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
On May 12, 2008, at 7:23 PM, Shane White wrote:
Wayne, I don't understand the concept of variable passband filters.
Surely
the K3 will just choose a filter based on the current operating
frequency,
and that filter will be used over a range of frequencies. How are
these new
filters you describe different?
wayne burdick wrote:
3. Later this year we'll be offering variable-passband crystal filters
that each cover a significant bandwidth range, e.g. 200-400, 400-800,
etc. (These are not finalized.) Each of these filters will have 8
discrete bandwidths. As you adjust the DSP controls, the K3 will again
optimize the passband of the selected filter.
73,
Wayne
N6KR
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