[amsat-bb] Re: Power output for using AO-73 transponder

[Paul Stoetzer]

Wow! 2 watts or so EIRP from inside. That's incredible. What was the
elevation of the satellite at the time?

73,

Paul, N8HM



On Sun, Dec 8, 2013 at 11:39 PM, Wyatt Dirks <wyattdirks at msn.com> wrote:

> Well tonight I was trying a few things on ao-73. But mid pass I got bored
> if you will and I turned around and grabbed my ft817. I had the mic hooked
> up and had the stock rubber duck installed already. I dialed in the correct
> uplink frequency and did I quick test call and sure enough I saw a trace on
> the water fall. I thought I had it set to five watts but after pass looked
> and I had it set to 2.5w out. So I heard myself through the transponder
> using 2.5w into the stock rubber duck on ft817. The link below is a short
> recording of the audio I got.
>
>
> https://www.dropbox.com/sh/1ggmarxnx2otjxz/Gjh6imD01t/ft817%20rubber%20duck%20on%20ao73.wav
>
> Anyway it doesn't take much power to work ao73.
>
> 73 Wyatt
> AC0RA
>
> > Date: Sun, 8 Dec 2013 15:13:24 -0500
> > From: n8hm at arrl.net
> > To: amsat-bb at amsat.org
> > Subject: [amsat-bb] Power output for using AO-73 transponder
>
> >
> > FYI - In a sidebar on their website, AMSAT-UK requests that stations
> limit
> > power output to 25W EIRP for using the AO-73's transponder.
> >
> > "FUNcube-1 / AO-73
> > Radio Communications Subsystem
> > • 145.935 MHz BPSK Telemetry 30 or 300 mW
> > • Inverting SSB/CW transponder 300 mW PEP
> > - 435.150 – 435.130 MHz Uplink LSB
> > - 145.950 – 145.970 MHz Downlink USB
> > Educational Telemetry beacon is 300 mW during day and 30 mW at night.
> > Transponder is only active during night passes.
> > Please use a maximium uplink power of 5 watts to a 7 dBi gain antenna
> (25 w
> > EIRP). Lower power will also work well.
> > If adjusting for Doppler shift manually try tuning the uplink frequency
> > while transmitting to keep the downlink constant."
> >
> > http://amsat-uk.org/
> >
> > 73,
> >
> > Paul Stoetzer, N8HM
> > Washington, DC
> > _______________________________________________
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