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sounds like oscillation.


i am wondering if someone cranked the bias pots on the driver and final.


try setting the bias on the driver and finals using these instructions: http://www.cbtricks.com/radios/galaxy/dx99v/dx99v_trans_adj.htm


when they say to remove the "metering jumper" they are referring to the little PC board sitting vertically in front of the driver and finals.


just a guess.

LC