On Apr 27, 2015, at 12:56 PM, David G3YYD wrote:
> This [LTRS] is unnecessary whether USOS is
> on or off.
A USOS transmitter needs to send an explicit LTRS shift when sending certain
sequences, if the receiver is not using USOS. Otherwise, a "599 OR" from the
USOS transmitter will be received as "599 94" by a non-USOS receiver for
example.
It is faster, and more error free (more redundant characters == more percentage
errors) to not use USOS when exchanges are all (or mostly) numerical. The way
out with USOS is to use no delimiter (599001) or use the "-" delimiter between
numbers (599-001).
73
Chen, W7AY
_______________________________________________
RTTY mailing list
RTTY@contesting.com
http://lists.contesting.com/mailman/listinfo/rtty
|