[Elecraft] K3: Mode change while running DATA-A

[Edward R Cole]

I'm not asking for help fixing anything but just offering this as 
interesting phenomena that I encountered.

A couple weeks ago I was running digital sw using the mode JT-65c 
(part of WSJT9.3) on 1296 eme and had two Australian stations reply 
on a chat room we use for coordinating that my signal seemed to be in 
LSB.  They had trouble getting my fairly good eme signal to decode 
until the they noted the signal seemed to be LSB and they switched to LSB.

I checked my K3 settings in DATA MD and DATA-A was selected for USB, 
plus I was receiving signals in USB.  So how could this happen.  I 
wondered if it had anything to do with the fact I was running split 
VFO's for Tx and Rx?  Running split is needed at this high frequency 
because Doppler shift of frequencies can be as high as +/- 2-KHz.

Unfortunately, the Aust stations had to QRT before I could try 
running without split.  A day later I worked both with the same set 
up with all receiving USB with no problems.

This quite puzzling as I have run JT-65 on 2m eme for years with the 
K3.  I had not made any change in settings only moved operation to a 
different transverter (the same 28-MHz IF was used in the K3).  I do 
not run any other digital modes so DATA-A is always selected when 
running digital.  I commented to some other eme operators and they 
asked if my transverter used a inverting conversion (LO higher in 
freq than RF or IF), but I was receiving normally in USB with the 
same transverter??  The LO is fixed at 1268-MHz which I even checked 
with my counter.

I had been noted on the MoonNet e-mail reflector of strange effects 
from Aurora on eme signals just hours earlier so I am now wondering 
if we were similarly affected.  No way to verify it, so it will 
remain a mystery.

73, Ed - KL7UW
http://www.kl7uw.com
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