Re: [amsat-bb] Is anyone working on equipment for C-C Rider?

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

Hi Bob,

I think that you're taking the right approach. I've seen a lot of email on the
AMSAT-BB that assumes digital and analog modes are mutually exclusive. For good
technical reasons space-based and earth-based digital communications have also
taken different paths in the past. High-speed DSP (whoever provides it) has the
flexibility to provide unification with a truely all-mode radio. For example, if
I have a radio for the 23 cm band it should be able to support not only CW, SSB
and NBFM but also ATV and wideband digital modes for satellite and terrestrial
use. Likewise, an ATV repeater occupying 6 MHz should support analog ATV,
high-speed data and any other modes that the users choose.

73,

John
KD6OZH

----- Original Message -----
From: "Robert McGwier" <rwmcgwier@comcast.net>
To: "John B. Stephensen" <kd6ozh@amsat.org>; <Dquagliana@aol.com>;
<amsat-bb@amsat.org>; "Edward R. Cole" <al7eb@acsalaska.net>
Sent: Friday, 05 November, 2004 23:15 UTC
Subject: RE: [amsat-bb] Is anyone working on equipment for C-C Rider?


> What current CC Rider communications protocol?  We are still attempting to
> decide what the block diagram of the package will look like.  We are buying
> pieces of technology to do an evaluation of the suitability to do the jobs
> that need doing if our grandest wishes can be realized.
>
> We are buying A/D's to do Rad testing to see if the SDR approach with these
> devices is even feasible. Until recently, we did not know if we could fly
> 34 A/D's and not use 200% of the power budget for the package.
>
> We are going to use your recent SDR offerings (I recommend everyone read
> John's articles from QEX in the last couple of years) as well as the
> USRP in order to build simulations of the transponder operations to see
> what it is we think we can do.
>
> Bob
> N4HY
>
> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> Behalf Of John B. Stephensen
> Sent: Thursday, November 04, 2004 8:44 PM
> To: Dquagliana@aol.com; amsat-bb@AMSAT.Org; Edward R. Cole
> Subject: Re: [amsat-bb] Is anyone working on equipment for C-C Rider?
>
>
> I don't know the details of the current C-C Rider communications protocol,
> but
> terrestrial and space digital radio communication methods are generally are
> very
> different as there are so many objects on earth to reflect, diffract and
> absorb
> the signal. However, the proposed use of DSP on Eagle removes this conflict
> and
> it could also revolutionize earth-based repeaters.
>
> If the amateur community starts using high-speed DSP in home stations and
> earth-based repeaters, the same hardware can be programmed with the optimal
> modems and protocols for terrestrial and satellite links. DSP could also
> allow
> mixing of analog and digital modes -- allowing everyone to use the mode they
> want. With the right software, analog and digital modes could even
> interoperate.
>
> 73,
>
> John
> KD6OZH
----
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