On 5/31/2018 1:16 PM, George Molnar wrote:
Would a unique CQ message for contest mode work, or is that asking for
confusion?
Normal mode: CQ KF2T FM18
Contest mode: CX KF2T FM18
The contest community is smaller than the general population, so it
might be an easier “sell."
*George J Molnar*
Arlington, Virginia, USA
KF2T - FM18lv
Confusion, to be sure. But that's not the real problem. To understand
the real problem you need to understand the way JT-style structured
messages fit all the necessary information into 72 bits. If you care,
a good place to start would be Reference #4 here:
http://physics.princeton.edu/pulsar/k1jt/refs.html
"CQ KF2T FM18" is a standard JT-style structured message.
"CX KF2T FM18" is a free-text message. Double clicking on it will not
start a QSO.
The problem is not the contest community. Serious contesters know what
to do. Casual operators who get on during the contests are the
important target audience here.
One final point. Structured messages are essential to the extreme
sensitivity of WSJT-X modes, nd to packing all that user information
into 72 bits. Consider the following message, an example of messages
frequently exchanges in EME QSOs:
KA1ABC WB9XYZ EN37 OOO
Like all other standard messages in WSJT-X, this 22-character message is
conveyed in 72 bits -- effectively 3.273 bits per character. Conveying
the same message on a character-by-character bases would need ~120 bits,
and the loss in sensitivity would be 10*log10(120/72) = 2.2 dB.
We don't give away even tenths of a dB without serious thought and the
promise of major advantages.
-- 73, Joe, K1JT
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