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Such a feature is not practical in an HT.


Even in the case of HT you mention, the cross-band repeat function is undocumented.


The reason is that a repeating function is a high-duty-cycle operation.

A handi-talkie, being a small form-factor with battery is not capable as such.


Generally a repeater (cross-band or otherwise) needs to be realatively located high in elevation, have a good antenna system, and have heatsink for long duration transmitting.