Chad,
The 851's were originally designed for the overseas market where 25 watts was the max allowed in some countries. Kenwood later on started selling them here in the US. They are roughly? based on the 850 Version 2 firmware and use the same software.
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They are rated for 1-25 watts continuous duty, where as the TKR-850 are 45 watt radios that are rated for continuous duty at 25 watts.
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If you have a TKR-851, that is the ideal radio to use with your amp.
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Joe - WA7JAW
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