[amsat-bb] Re: Increasing range from LEO/SpaceX/APRS

Luc Leblanc lucleblanc6 at videotron.ca
Fri Sep 4 00:41:06 PDT 2009

On 3 Sep 2009 at 20:12, Rocky Jones wrote:

> > > the APRS satellites on 145.825.  We just need several of them in
> > > orbit at the same time.
> SpaceX has just scored a large contract with ORBCOMM to put their next gen birds in orbit (using the Falcon1E)...a small APRS generic satellite might just substitute for ballast
> Robert WB5MZO
The digipeat APRS/text signal on multiple LEO'S is could be an alternative solution to a HEO but i will go a bit further and is it possible 
to have DSTAR FM transponder on multiple LEO'S? With the new small size transponder made by William PE1RAH it will be something to 
investigate. DSTAR can even send  APRS data D-PRS and digital audio in the same transmission.

Do not forget that any analog FM repeater which does not filter CTCSS tone (audio taken at the discriminator directly) can transmit D-Star 

Since my first experience with DSTAR i firmly believe a small cube sat will be soon be possible and with the fabulous linking capabilities 
of DSTAR communication protocole it will also be possible to have of some sort of intersatellite linking system.

Remain to see how to have a wide FM transponder.

As DSTAR is quite in advance in Japan i will not be surprised to see something coming out there. With the new JAXA H-II transfer vehicule 
did we overlooked a launch opportunity? again our Japanese friends seems to be quite impress with William pico transponder! did they have 
something in mind?

Here is some link of interest.


P.S. I am looking for someone with DSTAR capabilities to try some DSTAR satellite transmission as the AO-27 first DSTAR test in 2007. I 
already have Robin AA4RC in my urcall list and i can see his amsat.org text message passing in my screen!!! Just put my call sign in your 
urcall list the next step is to find a common footprint. Just go on http://www.ao27.org/AO27/index.shtml at the bottom of the page you will 
have all you need to program your DSTAR radio parameters.

SSTV text chat and file transfer is also possible on DSTAR too.


Luc Leblanc VE2DWE
Skype VE2DWE


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