[GreenKeys] SITOR / AMTOR / NAVTEXT protocols

[Bob Camp]

Hi

The problem with the "modern" protocols is that they are error  
correcting / retransmit protocols. If the receiving end sends a "nak"  
you transmit the same packet again. They all have provisions for  
multiple packets in transit, so keeping things lined up is a pain.  
The character coding is normally straight ASCII plus a CRC or check  
sum for most of them.

Bob
KB8TQ

On Sep 20, 2007, at 3:02 PM, tony j. podrasky wrote:

> GE OMs;
>
> I'm always impressed with the vast knowledge within this
> group. I hope one of you can point me in the right direction.
>
> I dabble a bit programming in C. I wrote a little routine
> to convert Baudot into ASCII so I can use my laptop at night
> to copy RTTY.
>
> Converting Baudot to ASCII is easy - it's just a simple
> character to character conversion.
>
> SITOR / AMTOR / NAVTEXT is different: there are different
> modes: you've got FEC, ALIST, etc.
>
> Does anyone know where I can find out what the protocols are?
> I need to know things like control codes (telling the receiving
> and transmitting station what to do), how many bits are in a
> character, etc.
>
> I've gone to the CCITT website and navigated for hours, only
> to find they want big bux for something that I'm not even sure
> is what I am looking for.
>
> 73,
> W6ESE - tony
> NNNNZCZC
>
> -- 
> Tony J. Podrasky | We owe most of what we know to about 100 men.
>                  | We owe most of what we have suffered to another
>                  | hundred or so.
>                  |                                   -R.W. Dickson
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