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how to lower output power on Motorola GR1225 repeater



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There were 2 versions of the R1225 made. The "High Power" version did 25 (low) or 40+ watts (high). Don't run an R1225 on high if you want it to live. They're famous for burning up. The high power versions are pretty easy to distinguish because they've got a pretty large set of cooling fins as compared to a typical MaxTrac or GM300 mobile.  Model number M44GRC90C2AA.

The lower power versions would run from 1-10 watts. They had a smaller set of cooling fins - similar to a typical Radius mobile. Model # M04GRC90J2AA

If you have the 1225 CPS Software, and the proper equipment, you can tweak the radio's output power for the high/low settings, but I wouldn't recommend going below 23 watts or so on the High power version. Trying to put it down to 15 watts is asking for trouble.

Repeater-builder is a great resource for Motorola repeaters.


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