Re: [amsat-bb] AO-51 PBP modulation scheme

["John B. Stephensen" <kd6ozh@xxxxxxxxxxx>]

The 9600 BPS and 38,400 bps PACSATs use G3RUH type modems. The design was
published by the ARRL 10 years ago and is probably in their high-speed
packet radio book. I haven't seen any kits available, but you might search
the web.

73,

John
KD6OZH

----- Original Message -----
From: "Andrew Harris" <andrew.unit@gmail.com>
To: <amsat-bb@amsat.org>
Sent: Tuesday, March 08, 2005 19:10 UTC
Subject: [amsat-bb] AO-51 PBP modulation scheme


> Hello,
>
>    I am interested in interacting with the AO-51 PACSAT, but I can't
> really afford the PACComm Spirit-2 and was looking at the various
> types of homebuilt modems, like the Alef Null DSP modem, and the YAM
> FPGA based modem.
>
>    However, I have read that while these are "packet radio modems",
> they are not satisfactory for satellite work.  I was assuming the
> reason for this is they don't support the type of modulation used by
> AO-51 PACSAT.
>
>    I don't really understand why they wouldn't be useable, and am
> wondering if anyone has some suggestions for homebuilt modem/TNCs that
> would be useable for AO-51 PACSAT.
>
> thanks,
> -andrew
> ----
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