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."
73,
Paul Stoetzer, N8HM Washington, DC
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%...
Anyway it doesn't take much power to work ao73.
73 Wyatt AC0RA
Date: Sun, 8 Dec 2013 15:13:24 -0500 From: n8hm@arrl.net To: amsat-bb@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."
73,
Paul Stoetzer, N8HM Washington, DC _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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@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%...
Anyway it doesn't take much power to work ao73.
73 Wyatt AC0RA
Date: Sun, 8 Dec 2013 15:13:24 -0500 From: n8hm@arrl.net To: amsat-bb@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."
73,
Paul Stoetzer, N8HM Washington, DC _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (2)
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Paul Stoetzer -
Wyatt Dirks