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

[Bob Bruninga <bruninga@xxxxxxxx>]

On Thu, 25 Apr 2002, someone reflected a common comment about mode 10/V:

> Why do you want to eliminate those of us with tech licenses?

There is no intent to eliminate anyone.
>From an engineering standpoint, the order-of-magnitude improvement in mode
10/V in simplicity, ease of use, relatively constant user power, strong
signal, minimal doppler, easy reception, and low cost transceivers is a
combination that just cannot be beat.

No one is being excluded, since anyone is welcome with open arms to
upgrade to general class amateur radio license.  With the relaxation of
the CW code requirement to 5 WPM, most people can probably pass the
general test with just a weekend of study.

> 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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