Hi Ludwig,
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Yes I red document before, but I could not trace the problem as sometimes it was working sometimes did not. Anyway resoldered all connections for 30/20 LPF and issue seems to go away. I made since about 10 QSOs on different bands and various times with switch ON/OFF between sessions. All seems good.
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Thanks for your help.
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73 de Marek SP9TKW
Marek SP9TKW