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Re: Minimalist equipment



Thank you Ed.

Hopefully more stations will check in with reports from periods when the
u-rx receivers are not having the AGCs driven so that we can get a sense of
the REAL uplink requirements and put an end to the high power requirement
comments floating around.

73s,
Lee-KU4OS
----- Original Message -----
From: <G0MRF@aol.com>
To: <71611.76@compuserve.com>; <amsat-bb@AMSAT.Org>
Sent: Sunday, May 06, 2001 23:48 PM
Subject: [amsat-bb] Minimalist equipment


> Hi  Ed / All.
>
> After reading about the 18dB of AGC I decided to get up at 02.00 local and
> see how sensitive the transponder is when there's only a few users. (mid
> atlantic to Japan in the footprint)
>
> TX:  9 element Yagi (Tonna) on 435 with a Bird 43 Wattmeter at the
antenna.
> RX:  26 turn helix and Drake 2.5dB noise figure + FT290
>
> With the antennas in the shack pointing out of the correct window and
aligned
> with the satellite I reduced power.  With only two other stations on AO-40
at
> the time the minimum power for 100% copy was 6 Watts RF out.
> The Yagi was quoted as 13dBi by Tonna so I guess that's about 73 W  ERP
> referenced to a dipole.  Pretty good...
>
> AO-40 was 39,000km range with an excellent squint angle at the time.
> This is exceptional. Under normal conditions I really need a small dish
for
> anything beyond 40,000km.
>
> As a bonus I managed to work JA6BX and 4X1AS later in the orbit. Great
fun!
>
> 73
>
> David  G0MRF
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