[Elecraft] K3 CW Rx Audio

[Paul Christensen]

Bob,

This has been re-hashed before by myself and others but here goes...

The K3's CW receive bandwidth is presently limited to no greater than 2.8 
kHz, even when the optional 6 kHz filter is installed.  At the moment, the 
DSP is the limiting factor.  I would rather not re-visit the rationale for 
wanting a wider CW receive bandwidth as that is covered in detail within the 
list archives.

The procedure that I described is a means of opening up the receiver beyond 
2.8 kHz while being engaged in a CW QSO.  Simply put, it allows the use of 
SSB mode with an offset for CW reception (VFO A), while using CW mode ( on 
VFO B) for transmission.

73,

Paul, W9AC

----- Original Message ----- 
From: "Bob Cunnings" <bob.cunnings at gmail.com>
To: <elecraft at mailman.qth.net>
Sent: Monday, April 21, 2008 10:27 AM
Subject: Re: [Elecraft] K3 CW Rx Audio


> Ok, as it is now you can open up CW rx all the way to 2.8 kHz if you
> like with the 2.7 kHz filter installed - and *enabled* for CW mode.
>
> Do you have the 2.7 kHz filter enabled for CW mode? If not, then I can
> understand the need for this split setup to "open up the DSP filters"
> for CW rx. Since filters are enabled on a per-mode basis, things can
> get a bit confusing.
>
> Bob NW8L
>
> On Mon, Apr 21, 2008 at 6:44 AM, Paul Christensen <w9ac at arrl.net> wrote:
>>
>> > In the CONFIG menu, there is a SPLT SV entry which you can turn ON to 
>> > save
>> the split. I just tried it on #202 with latest firmware and it works
>> here.73, Ken K3IU
>> >
>>
>>  Ken,
>>
>>  Good job.  With that suggestion, the entire procedure I mentioned
>> (including split recall) is now automated by saving into memory. (almost
>> like a macro?) Even better, by activating SPLT SV as you mentioned, one 
>> can
>> band hop and go right back to the saved split settings without having to
>> recall the memory. For example, I had called the CW Rx split procedure as 
>> I
>> described for 40M -- then tuned around on 20M SSB for a while and came 
>> back
>> to 40M where all settings were brought back with the just the band change
>> button.  Even tried powering down the rig, and all settings came back at
>> power-up.
>>
>>  Probably the only distraction with the procedure is that the lower, 
>> smaller
>> frequency display becomes the "real" operating frequency for CW off-set
>> purposes.  Oh, and CW spot will not work this way either.  So, opening up
>> the DSP filters in a future f/w release for CW Rx mode is still the
>> preferred way of accomplishing this.  Still, the flexibility to 
>> accomplish
>> this in the K3 and still retain all the QSK attributes is damn 
>> impressive.
>>
>>  Paul, W9AC
>>
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