neazoi
Advanced Member level 6
Hi, I am trying to figure out if a micro-tel 1200 wide range receiver needs service or not https://bama.edebris.com/download/micro-tel/1200/Microtel-1200_receiver.pdf
The receiver seems to work ok but:
If I connect a ham radio receiver at it's 30MHz IF output, I can notice the demodulated AM signals but there is lots of hum also there, so much that only the very strong AM stations can be heard along with much noise.
I also notice that exactly the same demodulated signal (and hum) is produced not only on the IF port but also on the video detector and the bolometer port of the receiver. These three ports connect to the same PCB inside, that of the IF amplifier.
So I wonder, should I open the receiver and try to see if there is something wrong with the IF PCB or the PSU (a faulty capacitor?) or does this behaviour seem normal in that receiver (maybe the RX is not intended for AM demodulation)?
The receiver seems to work ok but:
If I connect a ham radio receiver at it's 30MHz IF output, I can notice the demodulated AM signals but there is lots of hum also there, so much that only the very strong AM stations can be heard along with much noise.
I also notice that exactly the same demodulated signal (and hum) is produced not only on the IF port but also on the video detector and the bolometer port of the receiver. These three ports connect to the same PCB inside, that of the IF amplifier.
So I wonder, should I open the receiver and try to see if there is something wrong with the IF PCB or the PSU (a faulty capacitor?) or does this behaviour seem normal in that receiver (maybe the RX is not intended for AM demodulation)?
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