[RTTY] Minus sign to space serial numbers

[David G3YYD]

The other advantage of using space is it forces another figs shift so if
FIGS1234-1234 had corrupted FIGS by 1 bit to J then received is JQWERAQWER
but using space would get JQWER 1234. Saves doing the mouse pointer hover.

The one bit corruptions of FIGS are J, B, W, G. So when my callsign prints
as GWEYYD W is 1 bit corruption of figures quick look at keyboard says E is
3 so you have my call without asking for a repeat. I often use this. Just as
we all know TOO means 599.

It is worth remembering 1 bit corruption of FIGS as they happen so often. 

An aside LTRS 1 bit corruptions are ( ; 1 /  Future release of 2Tone in
contest mode will map ( and ; to LTRS reducing this source of errors
unfortunately contesters use 1 and / Still fixing 50% of the LTRS 1 bit
corruptions is better than none. Can't map FIGS shift as all the LTRS case
characters are used.

73 David G3YYD

-----Original Message-----
From: RTTY [mailto:rtty-bounces at contesting.com] On Behalf Of Bostjan Voncina
- S55O
Sent: 15 February 2018 20:27
To: David G3YYD
Cc: RTTY Reflector
Subject: Re: [RTTY] Minus sign to space serial numbers

what about length?
599 1243 1243
or
599 1243-1243

what is the difference?

space does need a ltr/fig ? or it does not need that?

thx and keep on the good info david.

gl
bostjan s55o

15. feb. 2018 5:40 PM je oseba "David G3YYD via RTTY" <rtty at contesting.com>
napisala:

> I wonder how many of you who use this technique realise why it is not 
> a good idea?
>
> The - (minus sign) is 1 corrupted bit away from 3, 2, \ and Line Feed. 
> So a
> 1 bit corruption will often result in a repeat request.
>
> Space character a 1 bit error goes to  , (comma), ' (quote), #, NULL 
> (5 bits of space tone). Much better to use space as human can see it 
> and work out what the serial number is.
>
> 2Tone avoids the NULL error as that is mapped to space character. Been 
> like that for years. NULL is also known as BLANK.
>
> So better to send 599 1234 1234 than 599-1234-1234
>
> 73 David G3YYD
>
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