I'm trying to get my K2 (SN 5711) working on digital modes, initially
just WSPR. I have the fixed audio output wired to pin 5 of the Mic
header, going to a Signalink USB which is working fine. Audio in/out,
keying, all just fine. If I transmit on WSPR my signal is being heard on
80m whether I'm in RTTY or RTTY REV. That in itself seems odd. I'm not
able to decode any signals even though I can hear them. I'm having a
hard time wrapping my brain around RTTY, RTTY REV, and when to use which
mode. Also have questions about setting up the filters using
Spectrogram. I've got the manual and I've searched the web for answers
which probably just added to the confusion.
First issue: RTTY & REV as it applies to USB/LSB
On 80m, mode RTTY, am I transmitting on LSB or USB?
If RTTY is LSB, when I switch to REV am I then transmitting on USB?
Is that true on all bands? I read about sidebands switching above 17m on
the K2. What exactly does that mean, and what effect does that have on
which sideband I'm transmitting on? When would I use RTTY vs RTTY REV?
If digital modes normally use USB, shouldn't I always be set to RTTY REV?
Second issue: Setting up filters
I read Don's advice regarding setting up filters for JT65 but it wasn't
clear to me about BF2, BF3, BF4. Don said to center the filter at 1000
Hz, and that the high value should be used for RTTY REV and the low
value should be used for RTTY. Say I have a filter setting of 700 Hz. In
Spectrogram I see a 700 Hz wide noise signal, do I center the peak of
that signal on 1000 Hz? I know that if I adjust the BF value to center
on 1000 Hz at 4912.85 that I can keep adjusting the value until my noise
disappears outside the filter and then will reappear and I can center it
again on a value of 4914.74. Should this high value should be used when
I'm setting the filter for RTTY or RTTY REV?
Third issue: BF4 running out of range
As I'm trying to adjust the center of the signal at 1000 Hz the filter
seems to run out of tuning range right before I get it centered, and the
value of the BF jumps from it's low value to it's high value.
I know that a lot of this is pretty basic but I'm just trying to get my
thoughts on this straight. It seemed to be a lot easier getting my K3 up
on WSPR but I think getting this K2/10 is just the thing for weak signal
digital work.
Thanks for any and all advice.
73, Dennis NJ6G
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