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Re: Survey: L and S minimums

Ed and Group for the Record.

Uplink. - Yaesu FT-847 (50 watts max) feeding 40 feet of LMR-400 Ultraflex
into a 8x8 element Yagi RHCP Only.
Downlink - 3 Foot BBQ Dish with integrated TranSystem down converter (A3373,
I did cut the stub) feeding 40 feet of RG-6 to a Conifer Power inserter
followed by a 10 dB attenuator in front of the FT-847 at 123 MHz.

I heard some good signals and the beacon was very loud (S7 my radio reads S0
with no signal).  My downlink never moved the meter.  Interesting to note
taking out the 10 dB pad bumps my S-meter up 4 S units (so much for 6 dB per
S unit!!)

I worked kb8vao, ve3frh, w7id, n6ors, ve3bcg, ac9r, and swled many more (yes
I heard you Maggie).

As we learn to fly the bird it will be neat to see things improve.  I know
the original final orbit is pretty much out of reach now,  I think I will
wait and see what developes before changing much of anything..  I know the
plan next is to complete attitude adjustments and then raise the perigee.
Afterwards maybe they will lower the apogee a bit.  If we have full control
there is no reason to leave the bird out so far, is there?


----- Original Message -----
From: "Ed Krome" <71611.76@compuserve.com>
To: "Amsat BBS" <amsat-bb@AMSAT.Org>
Sent: Saturday, May 05, 2001 10:38 AM
Subject: [amsat-bb] Survey: L and S minimums

> Hi, All:
>         Wow, AO40 was terrific on this first morning of transponder
> operation! After almost 10 years, what a thrill! Heartfelt thanks to all
> those who have busted their backends for so many years. You are
> appreciated!
>         I would like some information. I have updated "Mode S: The Book"
> and it will be available at Dayton and I still have one shot to add
> information before it's printed (really!). So, of all you hi-freaks (pun?)
> who were operating modes U/S and L/S today, please write back to me:
> 1) S-band downlink antenna size: WD4FAB was using a homebrew 16 turn helix
> and SSB UEK2000 converter and was hearing just fine. Anybody else using
> tiny antennas with good results? Most people I talked to were using small
> dishes (the truncated-parabola, "barbeque grill" style). Hearing was
> generally quite good (especially toward the end of the period). What were
> you all using?
> How were the downlinks in Europe at earlier MA's?
> 2) L-band uplink: those who experimented with 1269 MHz uplink, how much
> power and what antennas were you using? How were your signals? I had quite
> good reports with my 6-foot loop yagi (cut for 1296, not 1269) and maybe
> watts (don't know exactly). (Which, incidently, I found surprising because
> I was desensing myself almost completely. It was so bad, I had a lot of
> trouble finding my own downlink with L-up. The fun of homebrew.).
> Let me know!
> Thanks!
> Ed Krome K9EK
> editor/author "Mode S: The Book;   2001 Update for AO-40"
> ----
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