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The transmit audio problem is usually a challenge if the microphone is picking up RF.? There are hundreds of these radios that are working with the 12v bias, so it is less a design issue and more an issue with your specific radio.? Specifically, I would first look to see if the grond connection of the microphone is proper and the swr of the antenna. Can you tell us: 1. What antenna are you using? 2. What is the power and swr reported in CW mode? 3. What is the mic setting? - f On Fri, Jun 16, 2023, 4:42 PM <1aegisfc@...> wrote: Why is the microphone voltage so high? My friend measured and saw almost 12 volts. He the placed variable resistor across tge circuit reduced to 3.5v and had a lot better transmit audio. Please advise and fix this issue? |
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I agree with farhan,
The 12V bias is fine.? However the source of that bias is unfiltered 12V and it can have power supply and RF noise on it.? It makes the radio extremely sensitive to self induced RFI. For the DE version I have the supplied mic did not have a shielded cable it was terrible for RF pickup.? Replacing the cord only with a suitable shielded? (for the mic audio) one solved many issues. -- Allison ------------------ Please use the forum, offline and private will go to bit bucket. |
Joel Caulkins/N6ALT