Chinese VHF 6m backpack 884 radio – bad finals (updated)
2014-05-04 Leave a comment
Had some time today to test the radio. The receiver works – it’s quite loud. It was surprising to find 2-3 very loud music broadcasters on 45-50MHz band. Apparently, there is no volume (AF gain) control on the radio – I even checked the schematics but no, there is no one.
I guess that’s considered normal for army radios?
Everything seems to work fine except there is no RF output! After closer inspection, I noticed that the RF finals transistors are missing:
According to the schematic, the RF amplifier uses 2 bipolar germanium PNP transistors: 3AA9 and 3AA7 in TO-3 package: