Re: [amsat-bb] AMSAT's next LEO satellite

[Bob Bruninga <bruninga@xxxxxxxx>]

On Wed, 24 Apr 2002, Estes Wayne-W10191 wrote:

> I would prefer a new AMSAT LEO satellite to be something similar to
> RS-10 (mode V/10m linear transponder). The main disadvantage is:
>
> 1. SSB ground station radios are generally more expensive than FM radios.

But the easy solution here is to operate 10m SSB uplink and 2m downlink.
I called this MODE-V for upside-down mode-A in my AMSAT-2000 paper.  The
advantages are many, and significant:

1) Uses $150 Radio Shack (or other) cheap all-mode radios for uplink
2) Can use $50 downconverter to same radio for all-mode downlink
3) Omni uplink antenna, and consistent 25 W makes everyone about equal
4) Path length and Vertical ant gain pattern almost cancel each other so
   that signal at satellite for everyone is about the same (no overlaod)
5) 25W user uplink is more than enough for solid uplink on 10m
6) 2m downlink is 9 dB stronger to an omni receiver than UHF downlink
7) Launch will be near solar minimum so good use for 10m all-mode radios

Of course, my calling it mode-V was cute, but is confusing with the
current terminology on AO-40, so it might be best to just call this
mode-A inverted or mode 10/V?

We are looking for every opportunity to fly a 10/V payload like this...

de WB4APR, Bob


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