Ken,
First, investigate the filter settings for RTTY with Spectrogram. Be
certain the FL1 positions are correct (use the OP1 filter and set the
BFOs similar to those used for SSB FL1). You may set the RTTY FL2, FL3,
FL4 filters any way you wish, but FL1 must be set to OP1 and the BFOs
correct for that filter. The LSB settings (RTTY) will have the BFO
positioned below the filter center frequency (typically the BFO
frequency will be 4913.xx) and the USB BFO (RTTY-r) will be positioned
above the crystal filter center (typical 4916.xx). The .xx part of the
frequency will vary depending on the exact filter center frequency.
Secondly, revisit the carrier balance adjustment on the KSB2 board - you
can do that is SSB mode, but check using both LSB and USB - you may have
to compromise a bit between the two.
After doing the above, check the K2 on RTTY again - if you have audio
frequency tones going into the mic connector, it should work just the
same as for SSB - and on both sidebands.
73,
Don W3FPR
Ken Alexander wrote:
Hi Folks,
I reported this problem back in the spring but didn't
have time to act on it. Forgive me as I re-state the
problem I'm having.
I have a K2 equipped with Don Wilhelm's constant audio
volume mod for digital operation (hope I described it
correctly, Don). I also use a Tigertronics SL-1+
interface between my K2 and my notebook.
In LSB mode I'm able to transmit RTTY and PSK-31
without any problems. When I change the K2 to RTTY
mode I get no transmitter output (receive works fine).
The PTT indicator on the SL-1+ lights and the K2
receiver mutes, but there's no RF output indicated on
the K2's meter or an external power meter.
Cables and connections are fine, and as I mentioned,
simply switching to LSB gets me back on the air.
I don't get on the air as frequently as I'd like, and
at times sitting down with the K2 and using it is like
starting over from scratch. So, there's a good
possibility that something's not set correctly.
However, so far I haven't found a setting that would
disable RTTY output like that.
Can anyone help?
Thanks and 73,
Ken Alexander
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