Microphone Wiring Diagram
Replacing or repairing the cable on either of the Wilson microphones is not a difficult task. The amount of time should be 10-20 minutes, depending on the model and what is being done. As with any other bench work, careful attention to the soldering job will produce excellent results. Always double check each soldering step for a good flow of solder, a clean connection with no "cold" solder joints, and no loose strands of cable to short out.
1. Connector End Wiring
As viewed from cable side.
2. Inside Noise Canceling Mic
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Internal Wiring 1. Remove three screws from back of mic. 2. Carefully remove back cover from mic. 3. Remove three screws holding circuit board on mic. 4. Carefully move circuit board up and slowly fold left. 5. Wiring of mic cord is now visible and accessible. 6. Where cable is attached to circuit board - reading from top to bottom: Shield, White, Red, Black, Blue. NOTE: Yellow wire in cable not used. 7. Unsolder wiring from board. 8. Solder new cable to board. 9. Check for good solder flow with no cold solder joints. 10. Replace circuit board, aligning holes for screws, and replace screws. 11. Replace back of mic, and reattach screws.
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3. Power Amplified Microphone
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Internal Wiring 1. Remove three screws from back of mic. 2. Carefully remove back cover from mic. 3. Remove three screws holding circuit board on mic. 4. Carefully move circuit board up and slowly fold left. 5. Wiring of mic cord is now visible and accessible. 6. Where cable is attached to circuit board - reading from 7. Unsolder wiring from board. 8. Solder new cable to board. 9. Check for good solder flow with no cold solder joints. 10. Replace circuit board, aligning holes for screws, and replace screws. 11. Replace back of mic, and reattach screws.
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4. RF Feedback Squeal
Although not normally a problem with the Wilson microphones, feedback squeal may occur. Do not confuse this with the talkback feature of CB radios that are intended to let you hear yourself in the speaker if you want to adjust an echo, some other audio feature in the radio, or just like hearing yourself talk. If the mic is correctly wired and there are no broken wires in the plug or cord, the squeal is usually being caused by RF feedback.
The problem is not with the microphone. The RF feedback is an indication that some of your transmit power is getting into the audio or modulation circuit of the CB radio. It starts a continuous cycle of oscillation (or feedback). It is like a public address system where somebody gets too close to the microphone when they are talking. The most common causes of feedback are poor RF filtering in the CB, or high antenna SWR. In this section, we are going to assume that you have taken the SWR issue out of the running by having a tuned antenna. The cure will require only two parts - a 4700 Watt (4.7Kw, Yellow-Violet-Red), 1/4-watt or 1/2-watt resistor, and a .01µF or .001µF 50-Volt ceramic disc capacitor. These parts together should cost less than $3.00 (you can get them at Radio Shack), and will prevent RF energy in the transmit circuits from getting back into the mic.
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1. Open the back of the mic and using the mic wiring photos above, find the colored wire that is the actual audio or mic line.
2. After finding the audio line, cut it at a convenient spot and solder the resistor in series with the audio line. (See below). 3. While you have the back open, you can add some additional filtering protection. Solder one side of the ceramic disc capacitor to either side of your resistor connection, and the other side to the shield (ground) braid of the mike cable, as shown above. NOTE: On the Wilson mics, the shield is inside a protective covering. 4. Re-check the solder joints of all your connections and use black electrical tape over the connections to prevent any chance of a short. 5. Re-assemble your microphone, and you should have no more problems. |
