Tighten all connections, electrical and from the radio antenna connector all the way to the whip on the antenna.
Move antenna to different location and/or try different antenna.
Check standing wave ratio.
Have someone close listen to a transmission without any voice and while holding mic button, shake or wiggle mic cord. You might disregard this test if you exchanged mics when you exchanged radios.
Does this always happen when talking with the same person or everyone? Does it vary with the distance from the other radios.
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