[amsat-bb] Arecibo recordings

Luc Leblanc lucleblanc6 at videotron.ca
Sun Apr 18 04:43:08 PDT 2010

Here is 2 recordings of april 17 Arecibo EME transmission received on a linear 24 elements yagi with an Icom preamp on an FT-847 60' of LMR-


My first observation is while some seems to report great reception with moderate set up? i cannot say my first EME reception is Q5... When 
you listen the audio file put your volume up as KP4AO is way down in the noise but after a couple of try you will be able to detect some 
words from them.   The CW recording is much better with the maximum of filtering.

Conclusion:1- An LEO class satellite station does not make an EME station at all.
                 2- Accurately reporting a reception by ears is not an exact science... recording tells the truth without any doubts
                 3- My third file is giving some explanation about why my JT65B program give's me 4 EME call sign: F5BUU KU7Z  K3AX  IQ2CJ 

I will try this mode if they used it but as i does not want to be controversial i think the 4 stations that i got on my JT65B screen where 
probably never transmitting at the time of reception!!!

Just read the third file above and you will be able to understand more my point 2!

Anyway it was my first EME SWL reception "i hope" as some just tells me it is possible that tropo scater reflection in the caribbean and 
ducting made some getting the Arecibo signal this way as their EIRP made it quite possible explaining the rapid QSB reported by some 
station. Here as soon as i move the antenna off by 10 deg Arecibo disappear.

Just to pointed out i was listening the HAARP EME test 2 years ago and i was able to copy their HF ionospheric signal and their moon 
reflected signal much much weaker but some on the world where only able to get the moon reflected signal as they where out of range form 
the standard HF propagation path. Just to warned those in the tropo scatter/RF ducting path from Arecibo to checked if moving their antenna 
off the moon make the signal disappear.

P.S. If someone is aware of an audio software able to filtered out the noise from a recording just pointed me toward the source.

Luc Leblanc VE2DWE
Skype VE2DWE


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