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Re: Re: AMSAT's next LEO satellite
On Thu, 25 Apr 2002 K5OE@aol.com wrote:
> A 10 m uplink would fix problem #1 if it were in the 28.3 - 28.5
> spectrum, but I'm not sure how that fits with the IARU band plan (maybe
> OK for region 2, but region 1 specifies "satellite downlink").
ITU makes no distinction. ARRL lists it as downlinks, but only because
that is what has been there in the past. The ITU does not care whether it
is uplinks or downlinks and lists the whole band (if I remember
correctly).
Bob, WB4APR
> >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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> >
>
de WB4APR@amsat.org, Bob
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