[CQ-Contest] abt DVP problem

[Igor Mikheev]

I use  the DVP . During the transmission there is a strong 50 Hz ( AC )
phone in the signal . It becomes much lower when I touch the metal box of
my tranceiver .
The cable is soldered in exact accordance to the enclosed circitry (
electric diagram ) .
Did somebody meet the same problem ?
Is it possible to solve it anyhow ?

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