[amsat-bb] Flex 5000a FM tone issues

Jeff kb2m at comcast.net
Thu Apr 14 22:52:19 UTC 2016

I’m working my way through setting up my Flex 5000 for satellites. I’m very happy with the performance on the linear bird’s , but having some issues with AO-85, and SO-50. After getting some bad audio reports on SO-50 yesterday I tried to work the problem out with someone on a local repeater who was familiar with my voice. After a few minutes it became very clear that it was a CTCSS tone issue as simplex performance was excellent. I thought about this a minute and came to the realization that there might be a TX filter in play, and discovered, yes it was set to a default of 150 to 2700. Obliviously not FM values. So just before the last pass of AO-85 I quickly built an FM RPTR filter of 50 to 4k and saved it. It worked a bit better on the pass but I still had obvious issues.  Anyone have any ideas what the issue might be? I’m thinking a tone level issue, but after goggling I found  issues with CTCSS was too HIGH of a level. Any suggestions welcome...

73 Jeff kb2m

More information about the AMSAT-BB mailing list