[Elecraft] Elecraft K3 Presets/Settings for JT65B / EME

[Edward R. Cole]

Rich,

Thanks for the explanation for setting DATA-A.  I will try that.  It 
is strange that some frequencies have AFSK-A while others have USB 
under DATA-A?  But I will not waste effort trying to understand how 
that happened.  I want the wide-band submode for every instance of 
DATA-A.  So I will take my saved editor file and delete all the 
DATA-A Channels and write that to the K3, then ensure that DATA MD is 
properly set, fill the memories back in that I want DATA-A.  That is 
about 15 channels.

Regarding the limit of audio bandwidth...sigh!  I ordered two 13-KHz 
filters for both receivers in anticipation that it would pass the 
full bw in SSB if the filter was programmed for that.  I did not 
anticipate that it would be limited in audio stages.  I did not need 
to receive FM in both receivers so that was wasted expense since bw 
can be opened to 4.2 KHz with the 2.8 KHz filter.

Of course, I have added two LP-Pan to the K3 main and sub receivers 
that passes full bw of the first IF before the roofing filters, so I 
can accomplish what I want to do which is to run MAP-65 at 96-KHz 
bw.  Running MAP-65 from the K3 audio using a soundcard would only 
allow 4-KHz to be sampled and not really worth doing.  Of course 
JT-65, WSPR, and other programs in the WSJT suite can be run on 
ordinary audio thru a soundcard.

It looks like running any external sw with the K3 will require adding 
a SDR to the 1st IF (LP-Pan, SDR-IQ, soft-rock, etc.).  The P3 is 
expected to permit exporting I-Q data at some future time so those 
acquiring the P3 will eventually be able to run external sw, as 
well.  One of the most powerful programs for working weak-signals is 
Linrad, but it requires I-Q input.
http://www.kl7uw.com/LINRAD.htm
------------------------------

Message: 13
Date: Mon, 15 Aug 2011 15:02:52 -0400
From: "Richard Ferch" <ve3iay at storm.ca>
Subject: Re: [Elecraft] Elecraft K3 Presets/Settings for JT65B / EME
To: elecraft at mailman.qth.net
Message-ID: <8ec17c7fc6dacc8dc054361b9142a9c0.squirrel at home.storm.ca>
Content-Type: text/plain;charset=iso-8859-1

Ed,

If I remember correctly, when a DATA mode frequency memory is stored in
the K3 the data sub-mode is remembered as part of the information stored
at the time the memory is created. For example, if your K3 data sub-mode
happened to be AFSK-A at the time the memory was stored, I believe the
sub-mode will be restored to AFSK-A every time you recall that memory. If
this is correct, the way to get it to remember the DATA-A sub-mode would
be to delete your existing DATA mode memories and re-create them from
scratch with the radio in DATA-A sub-mode.

As I understand it, the K3's audio output is cut off at 4.2 kHz in all
modes, including AM and FM, regardless of which IF filter is selected.
Assuming no EQ is applied (EQ is disabled in DATA modes), the output audio
response will be nominally flat between approx. 200 Hz and 4.2 kHz,
subject to IF filtering and the SHIFT and WIDTH DSP control settings. If
your widest IF filter is 2.8 kHz, then your maximum nominally flat audio
bw in SSB-based modes (including DATA-A as well as USB) will be 2.8 kHz,
although you can use the SHIFT control to shift the audio passband within
the overall 0.2 - 4.2 kHz audio window. Note also that even if you have a
wider IF filter that is enabled in DATA modes, the wider bandwidth it
provides will only apply during receive - your transmit bandwidth will
still be limited by the 2.7 or 2.8 kHz transmit IF filter.

73,
Rich VE3KI





73, Ed - KL7UW, WD2XSH/45
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