[amsat-bb] Re: AO-27 Telem

Tue Jan 29 12:59:44 PST 2008

Hi Chris,

yes, we should contact the AO-27 team and ask for the missing channel
equations.

Regarding your question for the MixW settings. I described this on my
website - but it's in german.
You can take a look at http://www.dk3wn.info/mixw_kiss.shtml

But (it's easier for you) read here:
http://www.mixw.co.uk/tune/tuneaprs/tuneaprs.html

It's quite simple. I will write a decoding software for AO-27 (with KISS
input) - the telemetry is similar to IO-26. You can see my decoding software
here: http://www.dk3wn.info/software.shtml

73, Mike
DK3WN

-----Ursprüngliche Nachricht-----
Von: Chris Bloy [mailto:chris at photofuture.co.uk] 
Gesendet: Dienstag, 29. Januar 2008 21:42
An: 'Mike Rupprecht'; 'SV1BSX'
Betreff: RE: [amsat-bb] Re: AO-27 Telem

Hi Mike, Mak,

Any idea on the setting for MixW as I cannot get anything to decode even
close to your example?

I think that we should have access to telemetry on this one, and would be
willing to collect and build up a picture of what AO-27 is doing?

Perhaps we should contact Amrad and ask?

Thanks,

Chris

-----Original Message-----
From: Mike Rupprecht [mailto:mail at mike-rupprecht.de] 
Sent: 29 January 2008 18:00
To: 'SV1BSX'
Cc: 'Chris Bloy'
Subject: AW: [amsat-bb] Re: AO-27 Telem

Hi Mak,

yes - and no. AO-27 send it's telemetry in non-AX.25 frames. There is no
standard UI Frame and the most packet radio programs cannot decode this
frames.

BUT, you can use any TNC in KISS mode to generate a data file. The structure
of AO-27 telemetry is similar to IO-26 or the other microsats. 1 Byte
Channel number + 1 Byte channel value -> see my posting on AMSAT-BB.

AND there are some soundcard solutions (e.g. MixW) to generate an KISS file.

73, Mike
Dk3WN

-----Ursprüngliche Nachricht-----
Von: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] Im
Auftrag von SV1BSX
Gesendet: Dienstag, 29. Januar 2008 15:55
An: Chris Bloy
Cc: amsat-bb at amsat.org
Betreff: [amsat-bb] Re: AO-27 Telem

 Hi Chris,

 I think it's impossible the receiving of TLM without a TNC (hardware).

I tried also with "standalone" 1200Bps AFSK softwares for  packet radio
(like MIXW etc) without success.

 And yes, the TLM is "ON"  just for a few seconds at the beginning
(and at the end) of each "active" pass.

73, Mak SV1BSX

----- Original Message ----- 
From: "Chris Bloy" <chris at photofuture.co.uk>
To: <amsat-bb at amsat.org>
Sent: Tuesday, January 29, 2008 15:12
Subject: [amsat-bb] AO-27 Telem

> Hi All,
>
> Can anyone tell me how to decode the telemetry from AO27?
>
> I have tried to use MIXW in Packet mode and RTTY mode, but all I seem to 
> get
> is the date and nothing else? I even tried to feed it through AGWE to see 
> if
> that would work.. I use AO27 all the time and use a minidisc recorder to
> record my passes, and always capture the telem data at the end.. it would 
> be
> good if someone could help me out on this one?
>
> Thanks,
>
> Chris
>
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