Arecibo on 432 MHz Moon Bounce

Discussion in 'Amateur Radio News' started by G4TUT, Apr 6, 2010.

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  1. G4TUT

    G4TUT Ham Member QRZ Page

    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!

    73 from Joe, K1JT
    on behalf of all the gang at KP4AO

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  2. KV6O

    KV6O Ham Member QRZ Page

    400,000,000 Watts ERP?!? Almost half a Billion? Gee, I hope the Moon's still there when they are done! :p

    Might have to give this a try!

  3. KC8VWM

    KC8VWM Ham Member QRZ Page

    Ok, I'm ready... :)

  4. AD7N

    AD7N Ham Member QRZ Page

    What that I smell? Must be burning moon dust :rolleyes:
  5. K8ERV

    K8ERV QRZ Member QRZ Page

    Where is the repeater located?

    TOM K8ERV Montrose Colo
  6. ND0Y

    ND0Y Ham Member QRZ Page

    Where can I find the Keps for the moon? :D
  7. K3GAU

    K3GAU Ham Member QRZ Page


    GA ALL,

    For all you fairly new to amateur radio or young folks, they use to do this type of operation from Arecibo once in awhile back in the 60's and 70's. Back then they would operate on various bands anywhere from 6 meters up though 1296 MHz (23 cm).

    The key to success is the ANTENNA. The 60 dB of gain the antenna has (on 70 cm) works for both TX and RX. It makes their signal stronger to us and our pip sqeak reflected signal stronger to them! As any good QRP operator can tell you, the key to success is a good antenna!

    I've always wanted to try moonbounce. May dust off the 70 cm yagi and see if I can find a volunteer to point the thing!

    BTW, if you want to know what the Arecibo antenna looks like, go find a copy of James Bond's Golden Eye. Part of it was shot down there.

    GL to all.

    Dave K3GAU
  8. W7CI

    W7CI Ham Member QRZ Page


    TNX FOR PUTTING ARECIBO ON 432. I will be on for the prescribed schedule times.

    CU Steve
  9. KE4FSL

    KE4FSL Ham Member QRZ Page

    Satellite: Moon
    Catalog number: 000000
    Epoch time: 10074.43066632769
    Element set: 357
    Inclination: 24.8955 deg
    RA of node: 348.8584 deg
    Eccentricity: 0.0500
    Arg of perigee: 149.0499 deg
    Mean anomaly: 214.2222 deg
    Mean motion: 0.036600996000 rev/day
    Decay rate: 0
    Epoch rev: 0
    Checksum: 000

    Satellite: Moon
    Catalog number: 000000
    Epoch time: 10101.70977732396
    Element set: 357
    Inclination: 24.7577 deg
    RA of node: 348.6640 deg
    Eccentricity: 0.0454
    Arg of perigee: 151.9510 deg
    Mean anomaly: 210.6235 deg
    Mean motion: 0.036600996000 rev/day
    Decay rate: 0
    Epoch rev: 0
    Checksum: 000
  10. N9PSE

    N9PSE Ham Member QRZ Page

    Nice to know that after more than 64 years, the first earth-orbiting satellite used for communications is still working... ;)

    Thanks to the Arecibo folks for this opportunity -- will be making a "cheap yagi" for 432 and acquiring a 100w amp for my TS-811a to give this a try!
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