Chen,
Your explanation, as usual, is concise and far better than
I could have ever expressed it.
Thank you,
73, de N8PS
PS. I was sure that I was correct with the - sign.
----------
Quoting Kok Chen <chen@mac.com>:
> > Someone must have turned it off at the original poster's station.
>
> That is an incorrect analysis of the original poster's (AD1C) problem.
>
> The "599 PR AL" is due the fact that the receiver was using USOS while
> the transmitter was not. I.e., Jim *was* using USOS on his MMTTY
> setup. He never turned it off. It is the transmitter that was not
> using USOS.
>
> Moreover, using spaces in between numbers, when USOS is turned on, is
> a very bad idea. When USOS is engaged, the space forces the
> transmitter to send an extra character (FIGS shift) in between the
> numbers. For short contest exchanges, this extra character increases
> the probability of errors at the receiving end by a significant
> amount, not to mention slowing down the exchange. (Both are the same
> reasons that you do not use upper case characters in a PSK31 contest.)
>
> Since the "-" character in the Baudot code is in FIGS part of the
> table, the encoder will breeze right through the "599-3" part of the
> exchange without sending any unneeded shift characters, whether or not
> USOS is turned on at the transmitter.
>
> Indeed, 599-3 is encoded into exactly the same Baudot sequence whether
> the transmitter is using USOS or not, and it is received as 599-3
> whether the receiver is using USOS or not. It is the most perfectly
> cross compatible way to send RST and a zone number.
>
> I repeat, "599-3" sent with or without USOS is received as "599-3"
> whether or not the receiver is using USOS.
>
> If dashes are harder to read than spaces on the screen, just map a
> dash into a space in the software.
>
> 73
> Chen, W7AY
>
> _______________________________________________
> 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
|