[amsat-bb] Re: Arecibo on 432 MHz Moon Bounce (some calculations)
sq7dqx at poczta.onet.pl
Tue Apr 20 23:45:08 PDT 2010
60dBi is abt 57dB
It means 10exp5,7
ERP was 400x10exp5,7 W
----- Original Message -----
From: "Fabio A" <iw8qku at amsat.org>
To: <AMSAT-BB at amsat.org>
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
> ----- Original Message -----
> From: "MM" <ka1rrw at yahoo.com>
> To: <amsat-bb at amsat.org>
> 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.
>> (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
>> 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
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