If the checksum character is in error? Use another character to checksum the
checksum? Or would it be easier to just send the serial number twice? Then
if the 2 are different do a AGN request (shorter than sending NR?).
73 David G3YYD
-----Original Message-----
From: RTTY [mailto:rtty-bounces@contesting.com] On Behalf Of Kok Chen
Sent: 10 January 2016 03:05
To: RTTY Reflector
Subject: Re: [RTTY] RTTY Cut Numbers
One approach to an RTTY contest is to send a checksum with the exchange.
Even a single character checksum will be reassuring to a recipient of the
exchange, especially if the checksum is computed over the entire exchange,
thus includes the callsign of the recipient, if the callsign was also sent
as part of the exchange.
Add a checksum, and gone are the days when you have to send "AA5AU 599 123
123 " or "AA5AU 599 OR OR " and instead just send something like "(AA5AU
123)X" or "(AA5AU OR)X", where X is the checksum character, which is just
another Baudot character. (You can even remove the newline character at the
end of an exchange, HI HI.)
Or, "HNY 2016 DON (123)X", so the checksum only applies to the important
part of the exchange.
Someone who is not using a compliant program, or who is using a real
teletypewriter, can send a non-checksummed exchange. Recipients who don't
care can ignore that checksum character.
RTTY is a machine encoded/decoded data mode, why not take advantage of it?
We are basically today still using antiquated CW technology to send RTTY
exchanges.
73
Chen, W7AY
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