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Date: Mon, 09 May 2011 22:43:52 +0100
From: qrss <qrss@talktalk.net>
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Subject: Re: LF: test message
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 >A Breakfast or Tea time message is Start - followed by 3 tones with 12 
possible tones per unit =1728 posibilities - >followed by a Repeat - 
followed by the same 3 tones again - followed by Idle.

Make that 10 possible x 10 x 10 = 1000 of course, 2 tones are excluded.

On 09/05/2011 22:34, qrss wrote:
> Just a little more information on the way I am reading ZEVS  G3WCD and 
> me are 'singing from the same hymn sheet'
>
> There appear to be 12 tones.
> 7 is Idle or Start tone
> 1 is Repeat or Space tone
>
> A Breakfast or Tea time message is Start - followed by 3 tones with 12 
> possible tones per unit =1728 posibilities - followed by a Repeat - 
> followed by the same 3 tones again - followed by Idle.
>
> The repeat gives error  detection / correction in the one way 
> messaging system. I used it this morning when the complete message 
> unit 5 was corrupted and looked like a tone 3, closer examination 
> confirmed there was a tone 1 in the correct. expected, place.
>
> Note I could be completely wrong.
>
> 73 Eddie G3ZJO
> .
> On 09/05/2011 21:26, wolf_dl4yhf wrote:
>> Hi Eddie,
>>
>> You wrote:
>>> Did you ever put numbers to the data units?
>>>
>>> 080905.jpg is familiar to us as a breakfast or tea time 3 unit code, 
>>> reading 6,11,12
>>>
>>> 0080906jpg is more complex 3,8,6 - 6,8 ---- 9,11,10 - 12,4
>>>
>>> This has confirmed some as yet unused (unseen by me) data units 
>>> which I had surmised were there and useable.
>>
>> I didn't try to 'see' anything there, I am not even sure how many 
>> different 'tones' they actually send. But it doesn't seem that much, 
>> only a few bits per symbol.
>>
>> The filenames use the date in ISO 8601 format, which I often use for 
>> temporary filenames.. YYMMDD . With a full year number, the dates 
>> were 2008-09-05 and 2008-09-06. Not sure if the timescale was in UTC 
>> or local time back then (but compare this with Markus' post, the 
>> schedule seems to be the same still). I don't remember what happened 
>> on September 6, 2008, why they sent so many 'data bits' around and 
>> after noon. It's a pity my recording ends before the transmitter 
>> switched back to the 82 Hz idle tone on that day.
>>
>> 73,
>>   Wolf .
>>
>>
>>
>
>
>