Hey Guys,
I have a DR-140 Alinco transceiver for 2-meters, and it doesn't seem to be working properly. When I was talking to this other ham, he said I had like a AC hum on my signal. I checked the power supply and it seemed to be working fine, the voltage drop wasn't significant when I transmitted and there was a negligible amount of ripple. I tried another power supply and I still had the hum, so it's definitely the radio. The other ham said it might be my VCO in the radio, but I'm not sure. I opened it up and looked inside and I could see that D11 looked suspicious, the solder tabs looked burnt. I attached some photos so you can tell me what you think! I checked the diode with the "diode test" on my multimeter and it seemed fine. I also checked the resistance both ways and it has a high resistance one way and a low resistance the other way; like it should be. I'm not sure what's wrong.
I have a DR-140 Alinco transceiver for 2-meters, and it doesn't seem to be working properly. When I was talking to this other ham, he said I had like a AC hum on my signal. I checked the power supply and it seemed to be working fine, the voltage drop wasn't significant when I transmitted and there was a negligible amount of ripple. I tried another power supply and I still had the hum, so it's definitely the radio. The other ham said it might be my VCO in the radio, but I'm not sure. I opened it up and looked inside and I could see that D11 looked suspicious, the solder tabs looked burnt. I attached some photos so you can tell me what you think! I checked the diode with the "diode test" on my multimeter and it seemed fine. I also checked the resistance both ways and it has a high resistance one way and a low resistance the other way; like it should be. I'm not sure what's wrong.
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