Review ARSENE, AO-24.

https://space.skyrocket.de/doc_sdat/arsene.htm

Jan

WB6VRN

From: David G0MRF via AMSAT-BB <[email protected]>
Reply-To: David G0MRF <[email protected]>
Date: Saturday, 13 August 2022 at 3:13 AM
To: "[email protected]" <[email protected]>, "[email protected]" <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: [EXTERNAL] [AMSAT-BB] Re: Phase IV satellite

Hi Ashhar / group

Geostationary Transfer Orbit is a good starting point for a ride share, but adjusting the orbit with a single burn at apogee to give you a Geostationary orbit may not be the best choice, or even possible / desirable, with a limited budget.

An alternative would be to launch a cubesat style satellite to GTO and raise the perigee just enough to make the lifetime comply with the debris mitigation rules. After 15 years or so it burns up at perigee.

With an orbit from 35,000km down to 800km, a linear transponder could be used with current phone technology (SSB) during the lower part of the orbit. At higher altitudes where the limited link budget, say 4W, is  insufficient for the typical SSB + LEO pack, operators could use digital comms (think of another mode being added to WSJT-X) to overcome the path loss.

It would inspire some to improve their standard antennas and preamps so they can extend the range of CW/SSB QSOs up a sat altitude of around 10,000km. While at the highest altitudes, another group, more interested in weak signal digital comms, could communicate / develop software and techniques for the future.

73

David  G0MRF

-----Original Message-----
From: Ashhar Farhan <[email protected]>
To: Brian Wilkins <[email protected]>
CC: AMSAT BB <[email protected]>
Sent: Sat, 13 Aug 2022 6:37
Subject: [AMSAT-BB] Re: Phase IV satellite

What does it take to push a craft in GTO to GEO ? I guess that there is a single thruster involved. Do you think any lab will donate one?

The GTOs should be relatively inexpensive to get to. 

I can't see why Icoms and Yaseuas ant loosen their purse strings for a project like this. I have heard that they sold in excess of 20,000 IC-7300 last year alone. That is just one of their radios, and that is just one company. Then there is everyone from the tiny HF signals all the way to Kenwoods and Yaesu. Hams have patronized their products for long, at times, well past their sell-by-date. The FT817 was kept alive mostly by the sat operators.

If each picks up a million dollar ticket, with matching grants, 10 M USD isnt a big deal. It is also big business for them. An 8 MHz slice of space spectrum could otherwise cost them a few times over.

- f