Thread: Hacker Democrat
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Old 19th May 2017, 7:23 pm   #7
GeoffK
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Join Date: Mar 2016
Location: Essex, UK.
Posts: 602
Default Re: Hacker Democrat

The audio stage would appear to be working, bridge the contacts across the volume control in case this is open circuit. The next step working backwards from the volume control would be to check the detector diode. This can be tested with a multimeter either on the diode check range or the resistance range (with the radio turned off). Bridging the detector diode with a similar germanium diode such as an OA90 will show if this is where the fault is.
The IF is the Intermediate frequency stage and LO the Local Oscillator in the RF Radio frequency stage. Usually referred to as the Mixer/Oscillator as it mixes the incoming radio frequency with the Local Oscillator frequency by heterodyning to produce the fixed intermediate frequency.
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