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GM 300 UHF programming

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cordgrass

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I been searching the web trying figure out how to program the UHF frequency of the this radio (M44GMC29C1_). I need the UHF in a range from to 450-470. I got it connected to radio doctor but no luck on figuring out how to switch to UHF. I brought the radio to a local shop and channel one had a frequency of 412.25 and channel 2 was 417... i forgot what it was behind the decimal.
 

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sfd119

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You cannot change a VHF radio to a UHF radio with just software.
 

mmckenna

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That model radio is 403MHz to 433MHz. You cannot make it do 450MHz - 470MHz with software.

You need the correct model radio to do this.

You can sometimes trick the radio to working out of it's intended band using the MOTOROLA RSS SOFTWARE(!) by typing in the numbers while holding down the shift key.
I do not know if you can do that with a third party software, and it's _very_ unlikely you'd get the VCO to lock that far out of band.

Either way, that radio will have type acceptance for it's intended area of operation. Forcing it to go out of band will void it's type certification and it will not be useable anywhere other than the amateur radio bands.
 

mmckenna

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You cannot change a VHF radio to a UHF radio with just software.
An M44 GM300 is a 25-40 watt UHF radio. The software seems to be set up for VHF. Either way, it's not going to do 450-470. Wrong bandsplit radio. The M44GMC9C2A or M44GMC9C3A model radio is needed.
 
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