I tried dashes for awhile during WPX and then tried with spaces. Probably
not too conclusive but I had much less request for repeats with spaces.
73, John N1JM
On Sun, Feb 10, 2013 at 9:45 AM, Bill Turner <dezrat1242@yahoo.com> wrote:
> ORIGINAL MESSAGE:
> On Sun, 10 Feb 2013 04:47:06 -0800 (PST), you wrote:
>
> >I find Chen's lessons on the sound science behind RTTY very refreshing
> and very often there is something new I learn from them. The latest one is
> his analysis of using a dash between to separate 599 and the exchange(s):
> >
> >http://lists.contesting.com/pipermail/rtty/2013-February/038940.html
>
> REPLY:
> One can analyze this to death, but the fact remains that when the exchange
> is sent twice with spaces in between, USOS (Un Shift On Space) has two
> chances to get the FIGS/LTRS shift right, vs only once when dashes are
> used.
>
> Chen's analysis only sends the exchange once, and that makes all the
> difference. Most stations send it twice or even three times.
>
> Let me explain it one more time:
>
> If you send 599-001-001 and the one and only FIGS character is garbled,
> you print TOOAPPQAPPQ. There is no second chance for a correction.
>
> But if you send 599 001 001 now that EXACT SAME FIGS character is garbled,
> you print TOO 001 001. Even if TWO FIGS characters are garbled, you still
> print TOO PPQ 001. The only way you can get TOO PPQ PPQ is if ALL THREE
> FIGS characters are garbled.
>
> Which would you rather see?
>
> USOS was invented for good reason. Please let it do its job.
>
> Bill, W6WRT
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--
sent on my MacbookPro
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