UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Midland 77-805 Portapak transmit issue

SiriusHardware · 31st Oct 2019, 1:41 am

It sounds like your cable was, ironically, 'Microphonic'.

Thanks for doing that measurement.

Damo, I don't normally suggest things like this but since it appears that there is a DC short between circuit GND and the chassis on both of your variants of the radio anyway, try unsoldering the GND wire from 'MicGnd' where it lands on the PCB and take it instead to one or more different points on the metal chassis, and see if that makes a difference to your problem.

31st Oct 2019, 1:41 am	#29
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,548	Re: Midland 77-805 Portapak transmit issue It sounds like your cable was, ironically, 'Microphonic'. Thanks for doing that measurement. Damo, I don't normally suggest things like this but since it appears that there is a DC short between circuit GND and the chassis on both of your variants of the radio anyway, try unsoldering the GND wire from 'MicGnd' where it lands on the PCB and take it instead to one or more different points on the metal chassis, and see if that makes a difference to your problem.