Re: Elecraft K3 Presets/Settings for JT65B / EME

Posted by Edward R Cole on Aug 14, 2011; 12:29am
URL: http://elecraft.85.s1.nabble.com/Elecraft-K3-Presets-Settings-for-JT65B-EME-tp6683735p6684064.html

OK, thanks.  I had not altered DATA-MD since the radio arrived from
Elecraft. I guess that was set-up default for AFSK A.

I also note that I found the WIDTH control was narrowed to 45bps in
LSB, so I opened it up as high as 4-KHz.  There is still roll off
below 200-Hz.  That is fine for me as I find some harmonics of 60-Hz
below this so its good to reject the bottom 200-Hz.  My FT-847
exhibits the same LF roll-off when connected thru my HB soundcard
I/F, yet strong eme signals can still be seen below that.

With FL1 selected (13-KHz) and WIDTH adjusted to 4-KHz, and DATA MD
showing DATA-A USB, I get 200-3550 Hz display in spectraJT waterfall
(JT-65B).  If I switch to FL2 (2.8-KHz rooofing filter) it narrows
down to 250-2800 Hz.

But the fun is that the K3 does not remember my settings as soon as I
select another frequency from memory (it puts DATA-A back into 45Bps
AFSK A LSB).

So now I will have to figure out how to get the K3 to remember my
settings, or forget using the K3 Freq Memory Editor for programming
the K3 memories.  I do not see anywhere in the Memory Editor for
setting up DATA MD.  I went thru my digital channels and DATA-A is
randomly either DATA-A USB or DATA-A AFSK LSB.

73, Ed

At 01:44 PM 8/13/2011, Joe Subich, W4TV wrote:

> >   From this it appears TX EQ affects the audio passband in DATA., as
> > well as, SSB.
>
>
>No, from that it appears that you have DATA configured for AFSK A and
>not DATA A.  AFSK A shifts the passband to center on the MARK/SPACE
>tones as defined by the MARK frequency - i.e., FC = (MARK+SPACE)/2
>
>At 900-3400 Hz your FC is close to 2210 Hz which is FC for MARK=2125.
>
>73,
>
>    ... Joe, W4TV
>
>
>On 8/13/2011 3:22 PM, Edward R. Cole wrote:
>>I checked with WSJT9/JT-65B running the spectraJT waterfall:
>>I have no Rx EQ set up.
>>
>>TX EQ for SSB is -16, -16, -9, 0, 0,+3,+6,+6
>>With USB I have display 500-Hz to 2800-Hz
>>With DATA I have display for 900-Hz to 3400-Hz
>>
>>with no TX EQ:
>>USB  displays 250-2800 Hz
>>DATA displays 250-3400 Hz
>>
>>   From this it appears TX EQ affects the audio passband in DATA., as
>>well as, SSB.
>>
>>Cutting off the low freq below 900-Hz is a disadvantage for JT-65.
>>
>>
>>73, Ed - KL7UW, WD2XSH/45
>>======================================
>>BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
>>EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
>>DUBUS Magazine USA Rep [hidden email]
>>======================================
>>
>>______________________________________________________________
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>
>
>73, Ed - KL7UW, WD2XSH/45
>======================================
>BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
>EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
>DUBUS Magazine USA Rep [hidden email]
>======================================

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