If the radio has been modded, then it probably has a lot of audio. As well if you are using a power mic, it may be too much.
You also are probably getting some common mode current. This causes RF feed back.
Last but not least, your talk back, if you have it is probably too loud. Now I do believe you can not lower the TB in this radio. It is either on or off. If this is the case, it needs to be on a switch.
Adjust the gain on the radio and mic to even it out.
Have some one local listen to your audio to tell you if it is loud, too loud and over modulated, or not loud at all and make adjustments based off that, you may not need to go any more then 1/4.
Make sure the radio is properly grounded.
Make a 10" coil with about 6-8 wraps as close to the antenna as possible. this wills top common mode.
Lower or turn off talk back.
If it is still getting feed back, Hold the mic cord in the center, and close your hand around it. If the RF feed back stops, then you need to put ferrite chokes on the mic cord to stop the RF.
Answers & Comments
If the radio has been modded, then it probably has a lot of audio. As well if you are using a power mic, it may be too much.
- Adjust the gain on the radio and mic to even it out.
- Have some one local listen to your audio to tell you if it is loud, too loud and over modulated, or not loud at all and make adjustments based off that, you may not need to go any more then 1/4.
- Make sure the radio is properly grounded.
- Make a 10" coil with about 6-8 wraps as close to the antenna as possible. this wills top common mode.
- Lower or turn off talk back.
- If it is still getting feed back, Hold the mic cord in the center, and close your hand around it. If the RF feed back stops, then you need to put ferrite chokes on the mic cord to stop the RF.
You also are probably getting some common mode current. This causes RF feed back.
Last but not least, your talk back, if you have it is probably too loud. Now I do believe you can not lower the TB in this radio. It is either on or off. If this is the case, it needs to be on a switch.