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Old 3-Jan-2019, 8:31 PM   #11
Tower Guy
Senior Member
 
Join Date: Dec 2009
Location: Delmar, NY
Posts: 1,236
I believe that your existing preamp is overloaded. The clue is that you are having problems with real channel 31. An overloaded preamp causes third order intermod, which in this case is likely caused by real channels 33 and 35 mixing together to create interference on channel 31.

Can you remove the preamp from your system and try it without amplification? (Unplugging the preamp is not a valid test)
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