[Elecraft] CQ WPX RTTY Contest

Bill Frantz frantz at pwpconsult.com
Sun Feb 14 19:51:59 EST 2016


I just finished casual operation in the contest. I spent 
considerable time trying to find the best way to do RTTY with RUMlogNG.

RUMlogNG can use the RTTY support built in to the K3 via the 
RS-232 link. It works well for transmit, although given the 
number of times I had to repeat my call, I wonder if there was a 
slight frequency difference between the audio coming in to the 
computer thru the sound card from the radio and the transmit 
frequency. It seemed like there was enough of a difference that 
the running OP had to fine tune my signal to decode it.

I did center the CWT tuning indicator on the K3, and when I 
turned on Dual PB, the computer was getting the signal on the 
right frequency.

My big problem was on receive. I never got the radio to cleanly 
decode. It missed almost all the call signs, regardless of 
strength of the signal. I tried using fldigi, which did work, 
and cocoaModem which seemed to decode better than fldigi. I 
ended up using cocoaModem and logging manually. (Next time I'll 
probably steal the VGA screen from the P3 and use it as a second 
screen on the computer so I can see all of both programs windows.)

The question is, what am I doing wrong with getting decoding to 
work on the K3?

73 Bill AE6JV

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