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Re: New soundcard modes via satellite



Sil,

I tried Domino with FO-29. As you mentioned, it works as long as you keep 
the signal somewhat centered by hand tunning. It's about the same as using 
Hellschreiber (Feld Hell mode) with no AFC control.

MixW software already has an AFC that tracks doppler and it's aggressive 
enough to use on FO-29 running Olivia, Contestia, RTTYM and plain old RTTY.

I've found that the AFC works best when keeping the number of tones low 
(4,8, or 16 tones) with a 500Hz bandwithdwidth.

I understand Domino will be added to MixW in the future so it should be 
interesting to try.

73 Tony KT2Q






----- Original Message ----- 
From: "Sil - ZL2CIA" <zl2cia@amsat.org>
To: <amsat-bb@amsat.org>
Sent: Sunday, February 26, 2006 4:28 PM
Subject: Re: [amsat-bb] New soundcard modes via satellite


> Hi Group,
>
> Con, ZL2ALP tells me that his version on DominoEX can cope with only 100HZ 
> of drift (or Doppler) before the radio will have to be retuned. This is 
> too little at 70 cm on an LEO.
>
> We discussed the possibility of adding a means to cope with Doppler and 
> Con has suggested a couple of possibilities.
>
> He has also suggested a way of manipulating his software to improve the 
> copy of Doppler shifted signals. I shall try that approach this evening.
>
> Sil - ZL2CIA
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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----
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