After alignment per manual of the RF and mixer stages, my T4XB has got a squealing transmit audio which in my R4B sounds like RF feedback. The problem is on all bands and on both sidebands.
I did nothing but adjusting the four trimmers for each band to maximum. Afterwards I have checked cables, the mike plug, the mike (Turner +3B) and V9 in the mike amplifier. The problem is still there. Thanks Peter OZ8CTH
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