Hi Mateusz, It sounds like Spanish to me. I heard it during the pass also. In Spain some people use the 2 meter band for privat talk. They are not necessarily radio amateurs. It is an old story :-(
I tried to contact the Spanish authorities - but they do not do anything.
It is often worse on the AO-27 uplink at 145.850 MHz. Sometimes they block SO-50 - but you can not hear it - however they make it drop out.
73 OZ1MY Ib ----- Original Message ----- From: "Mateusz" sq7dqx@poczta.onet.pl To: amsat-bb@amsat.org Sent: Monday, November 30, 2009 9:32 AM Subject: [amsat-bb] morning pass AO-51
Hallo
Today morning I recorded signals from AO51 downlink with my call and a station in background: www.enduro.idl.pl/audio_sat/AO51_30_11_09_0754UTC.mp3 Elevation was 3 deg and lower. Station heard in background probably doesn't know that transmits within satellite part of 2m band, maybe it is not amateur?
Matt SQ7DQX