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

[k0vty@xxxxxxxx]

I have a question John
I understand that Eagle is being designed to use a SDR with 20 kHz
bansdpass .
The question is "Why is the SDR limited to 20 kHz "?

I have a concern that 20 kHz pass band will be over loaded if used on
Mode U/V
Please address my concern.

Joe  K0VTY
=================================
On Sat, 6 Nov 2004 04:11:03 -0000 "John B. Stephensen"
<kd6ozh@verizon.net> writes:
> 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
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the 
> author.
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> 
> 

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----
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