[Elecraft] Re: AGC Design of the K3

[Stewart Baker]

I like the description "DSP-tracking crystal filters", it really 
says what they will do.

73
Stewart G3RXQ 
On Mon, 12 May 2008 19:36:16 -0700, wayne burdick wrote:
> 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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>> 
http://www.nabble.com/AGC-Design-of-the-K3-tp17199520p17199832.htm
l
>> Sent from the Elecraft mailing list archive at Nabble.com.
>>
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