60dBi is abt 57dB It means 10exp5,7 ERP was 400x10exp5,7 W ----- Original Message ----- From: "Fabio A" <[email protected]> To: <[email protected]> Sent: Tuesday, April 20, 2010 8:26 PM Subject: [amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
> Hello all, > just a curiosity, how did you found that the ERP is "... 243,902,443 > Million > Watts". > > Thanks > > 73s > Fabio > iw8qku > > ----- Original Message ----- > From: "MM" <[email protected]> > To: <[email protected]> > Sent: Wednesday, April 07, 2010 3:06 PM > Subject: [amsat-bb] Arecibo on 432 MHz Moon Bounce > > >> Hi all: >> Here is a EME event you cant miss. >> Dust off your CW key, its time for Satellite, QRP EME. >> >> The 1,000 foot dish has 60 dBi on 432 mc and 400 watts. >> That comes out to be approximately 243,902,443 Million Watts ERP. >> >> enjoy >> >> wf1f >> www.marexgm.org >> >> (thanks to KB1MGI for passing on this data) >> >> >> Arecibo on 432 MHz Moon Bounce >> >> The Arecibo Observatory Amateur Radio Club will be putting the >> 1000-foot radio telescope on the air for 432 MHz EME from April 16-18. >> >> It can be heard with a small hand-held yagi pointed at the moon >> >> The scheduled times of operation are: >> >> April 16: 1645 - 1930 UTC >> >> April 17: 1740 - 2020 UTC >> >> April 18: 1840 - 2125 UTC >> >> Callsign: KP4AO >> >> Tx Frequency: 432.045 MHz >> >> Rx Frequency: 432.050 to 432.060+ >> >> Tx power: 400 W >> >> Antenna gain: 60 dBi >> >> System noise temp: 120 K (cold sky) >> >> System noise temp: 330 K (when pointed at moon) >> >> KP4AO can be heard with a small hand-held yagi pointed at the moon and a >> good receiver. A 15 dBi antenna and 100 W will be enough to work us on >> CW. >> >> Operators at KP4AO will do their best to work as many stations as >> possible. Each session will start with a brief announcement and CQ in >> SSB. SSB QSOs may continue for 30 minutes to an hour, if the QSO rate >> remains high. >> >> The mode will be shifted to CW as soon as it is judged that higher QSO >> rates would result. >> >> We will listen for calls at frequencies 5-15 kHz higher than our own, >> and even higher if QRM warrants. Callers who s-p-r-e-a-d o-u-t are more >> likely to be copied. >> >> If you've already worked us in any mode, please do not call again -- >> give others a chance. >> >> If we call "CQ QRP", we will listen for stations running 100 W or less >> to a single yagi. Please do not answer such a CQ if you are running more >> power or have a larger antenna. >> >> On April 18, if we reach a condition where most calling stations have >> been worked, and we judge that operating in the digital mode JT65B would >> produce a higher QSO rate, we will switch to JT65B. >> >> Note that any of these planned operating strategies may be changed as >> circumstances dictate. >> >> We are extremely fortunate to have been granted access to the world's >> largest radio telescope for this amateur radio good-will event. We look >> forward to working as many stations as possible in the alloted time! >> >> >From QRZ.COM >> >> KB1MGI > > ...snip... > _______________________________________________ > Sent via [email protected]. 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 _______________________________________________ Sent via [email protected]. 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
