[Elecraft] K3 Firmware 2.10,1.81 problems Update

[Rich (KE0X)]

As Julian suggested the problem is in MixW.  It has been 40 years since I had
the RTTY training course in the NAVY, but, it has to do with the convoluted
history of RTTY.  Although SSB is on the LSB on the HF bands below 30 Meters
and USB on those bands above 30 meters (Many reasons given for this most of
which are not correct) RTTY was based upon the frequency of Mark (2125) and
Space (2295) and the surplus military equipment available, unless you could
afford some of the high dollar HAL equipment (which was also used by the
military).  Military protocol was to have the Mark the lowest tone in
frequency. This was ok with most equipment made BPC (Before Personnel
Computers).  The PC brought out the conversion of telephone modems, use of
the modem IC’s and finally the PC sound card for generating these tones. If
you built a TNC out of a modem chip and did not include a reverse switch you
were stuck to either the low or high bands.  This was fixed on the PC with a
button to reverse the signal that you could click on and copying.  Some of
the Rigs treat RTTY as SSB, others put RTTY so that the Mark is always the
lowest frequency transmitted regardless of the band selected, and RTTYR
reverses this.  I have no idea what the protocol is for DATA (perhaps
Elecraft can tell us.)  As an experiment, try switching rigs in MixW and
observe what is happening to the signal frequency.  You wil not be able to
chang frequency with MixW but you can see what happens to the signal as you
turn the dial on the RIG.

Rich,
KE0X


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