· connect the audio line, ideally only when keyed. Be able to neatly solder and insulate those wires on the corresponding pins of the new plug. Ideally the mike line should make a complete circuit only when you key it. The remaining color is obviously the Mike or audio line. A meter on the mike line will jump when you key it. The word common as were using it means the same thing as Ground or shield wire. Only 4 wires are needed but bigger sockets often mean that more than one pin may be grounded.
In other words, this is the Ground. Microphone wiring can be a real pain if you arent sure how to work out which wire goes where. Touch the other Ohmmeter test probe to all the mike socket pins. Or probe from the inside of the socket if you can reach the connections on it. Note: As previously mentioned, many regular and power mikes come with a normally closed or shorted mike line. If one of the colored wires is obviously covered by the shielded braid, it's the Mike or audio line. The mike should then work normally, and you probably wont even notice the volume decrease.
Ham Radio operators review new sites every day since 1998, for potential inclusion in the Directory, and to evaluate the best place to list them. Youre looking for the wire that shows a kick power mike or a fixed resistance reading standard mike between it and the shield when keyed. If filtering the mike doesn't fix the problem, also check your antenna by substituting a Dummy Load. You may also see this in the unkeyed position. This problem shows up as a loud buzz, squeal, or the receiver going dead when you plug the mike in. Continue jumpering around until you hear a normal receive signal in the speaker.
This works 99% of the time. Step 2: Its very unlikely youll find any continuity between shield and the remaining non-audio colored wires. I accept no responsibility for information that is copied from this website and reproduced in any format on other websites. Contact us by email: click. Best way is to use a different mic and see if the problem goes away.
And is also more expensive. This leaves only pin 1 remaining, which must be the Mike line. In this case you need a separate set of mike switch contacts to wire it right, but most power mikes can be arranged this way. Note: Many power mikes will show a mike line reading of a few ohms all the time until you key it. Youll probably notice a slight decrease in receiver volume if it becomes necessary to resort to this method. Those models are specifically designed to let you hear yourself in the speaker so you can adjust an Echo or some other audio feature in the radio.
On a power mike, the battery must be installed before trying any Ohmmeter tests. Mark it on your sketch. Another color should show a short 0 W , or continuity with the mike keyed, and open with the mike button released. The obvious way is to look at the main chassis for a relay. Following are some typical examples.
Theres nothing wrong with the mike. Many times when keying it youll see the Ohmmeter kick up, then slowly settle down to a set value as the capacitors in the mike amplifier charge up. Mark the common Ground lead you just found. Feedback squeal is a very common problem. Start by jumpering any two mike socket pins together and see what happens. . Open the mike and figure out which colored wire is the actual audio or Mike line.
The mike or audio line can be found as follows: 1. This will have the shield wrapped around it. The cure is obvious: tune or fix that antenna! To begin, figure out which pin on the mike socket does what. In any case, only four wires are actually needed. If the mike brand you want to wire isnt shown youll have to figure out the color code yourself, which is very easy to do using an Ohmmeter. Or while listening to a signal, unplug the mike.
Also if your radio keys up when you plug mic in reverse the black and red. Some older relay switched rigs used a small shielded cable between the mike socket and main chassis, a dead giveaway that those are the Mike line and Ground. Now attach a clip-lead or a piece of bare wire to the common pin you found in Step 2. One color should show a short; i. Lets say the mike has the following wires in the cord: 1. By the way when looking inside the radio, you can just as easily find the common or Ground by noting which pin the shield of that audio cable is attached to. In these rare cases, there will be voltage to ground on two pins instead of just one; touching either of those pins to common will make the lights go out or blow the fuse.