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Maybe someone here has sams cb-155.

Without a schematic, all I can do is guess, but it sounds like the mic switch is not disconnecting the speaker during TX. Try with headphones. You will still hear yourself due to the switch not working (if thats what it is) but it shouldn't squeal. Wrong mic???

[QUOTE="brandon7861, post: 829830, member: 53724"] Maybe someone here has sams cb-155. Without a schematic, all I can do is guess, but it sounds like the mic switch is not disconnecting the speaker during TX. Try with headphones. You will still hear yourself due to the switch not working (if thats what it is) but it shouldn't squeal. Wrong mic??? [/QUOTE]

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