Jim,
>I was thinking that it had to do with the number of transmitted shift commands
You've asked what may seem like a reasonable, simple question, but the answer
is far from simple.
The background: In an effort to make RTTY reception more efficient, and to
improve the probability of proper RTTY decoding, the convention for most hams
is to enable a feature called Unshift On Space (UOS). UOS will force-unshift
the decoding software to letters mode (LTRS) whenever a <space> is encountered
in the inbound character stream, the assumption being that in the majority of
instances a letter will be the character following the space.
Assuming UOS is universally enabled, a station transmitting an exchange of
599<space>04<space>MI versus 599<space>MI<space>04 would send the same
shift-to-numbers (NBRS) commands in either instance – because the transmitting
station cannot assume the [NBRS] setting in the decoder survived the space
between 599 and 04. This is one instance in which the assumption of “letters
usually follow spaces” works against us.
599<space>[NBRS]04<space>[LTRS]MI
599<space>[LTRS]MI<space>[NBRS]04
-larry (K8UT)
-----Original Message-----
From: Jim Hooper
Sent: Friday, September 30, 2016 1:32 AM
To: rtty@contesting.com
Subject: [RTTY] CQ WW RTTY Questions
Relatively new to RTTY … a little less than a year.
A CW WW RTTY question: Why were some NA Stations sending 599 state zone,
while I sent 599 zone state? I would have thought that keeping the numbers
together would be better for efficiency.
73,
Hoop
K9QJS
San Juan Island, WA
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|