In older connex 3300's you cannot disable the talk back. Its part of the audio chain. If you disable the talk back you will loose your audio. There are 2 things you can do.
Hook a relay to the speaker so that when the radio key's id disconnects the speaker. (Big pain, not worth the trouble.)
The other will not disable the talk back but it will stop any squealing.
Use a noise canceling mic. An RK-56 will work great. You will get no squealing with that mic.
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