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Date: Mon, 09 May 2011 22:34:56 +0100
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Subject: Re: LF: test message
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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 .
>
>
>