Thunderpole T2000 revisited - screwdrivered mike syndrome
Автор: UK FM CB radio servicing
Загружено: 2022-11-07
Просмотров: 1208
Описание:
Following our 'On The Air' test on this radio after it's service work, Mr Chippie reported the radio sounded quiet; a fault reported by the customer that I thought would be cleared by resetting the deviation from the ridiculous 8Khz back to 2.2Khz with a peak at 2.5Khz.
It seemend the snag was mike gain. taking apart the microphone revealed a 2nd microphone insert. I've never seen anything as bizarre. The microphone supplied is an electet type which is powered. Adding a 200ohm dynamic element nearly shorts out the power to the electet and created intermodulation between the two. Removal of the second insert effected a complete cure & the deviation was once again reset inside the radio to a lower level.
Recorded 7th November 2022
Richard, G0OJF
Lincolnshire, UK
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