Hello , Tnx for all of you who responded to my query. A cure was found by just moving the downconverter a little bit away of the feed of the dish ( behind the reflector) along the boom. 73 renauld on4kvi ---- Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA. To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org