It has to do with how the radio transmits power - ( google vco for more info)
simply put, that part of the radio that produces output power has tight tolerances. Transmitting on an out-of-band frequency can damage that and other parts of the radio. The receive section of the radio is more forgiving, so you can listen to more stuff either side of the designed band. More modern equipment (Read $$) can handle the variations easier. You may be able to modify your codan (either the sw or hardware) but that's somewhat more complicated.



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