Keith,
DATA A mode is exactly like SSB except that it automatically turns off
compression and the TX EQ.
So I would suspect that your problems have more to do with your software
application and the commands it sends to the K3 than anything else. If
your application is switching the KX3 to SSB mode rather than staying in
DATA A submode, the compression and TX EQ settings you have for SSB
would distort the data mode signal.
Some software applications (older Ham Radio Deluxe and others) will
switch the K3 and KX3 out of Data mode and into SSB mode. I don't know
what Winmor and Pactor 3 will do.
The solution that I have used is to not let the software change modes -
in other words, do not click on spots or the data mode frequencies in
the software, but look at the frequency and use the K3/KX3 VFO to move
to those frequencies.
BTW, if you are using the microphone input from your interface, mic bias
should be set to OFF. If there are transformers in your interface box,
the addition of mic bias can cause current to flow through those
transformers and create distortion to the data stream. If you want to
leave Mic Bias turned on, add a series capacitor (1 uF to 2.2 uF) in
series with the AF line to eliminate the DC current through the transformer.
73,
Don W3FPR
On 4/22/2014 8:08 PM, Keith D Jones wrote:
I got my KX3 and KPA100 this past February and have a lot of fun so far with
it. I've been pretty frustrated the past few days trying to get
satisfactory RMS Express performance using both Pactor 3 and Winmor.
I built a cable for my Navigator and quickly had it working with the KX3
choosing the USB Data mode in the Radio Setup (K3 radio choice). I quickly
made a connection and sent a small message.
The past few days I have been trying to get my SCS PTCIIex Pactor 3 modem
hooked up. I built a cable and rebuilt it 2 more times! The problem that I
kept getting was a connection and either very slow and error (ARQ Repeat in
RMSE and error light on TNC) or a disconnect after unsuccessful handshaking.
Since I could connect I thought that maybe there was a problem with the
cable.
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