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UHF Portables: Why Only 4 Watts Instead Of 5?

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ASAD

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How come some UHF portables only give you 4 watts of transmit power instead of the full 5 watts? Sometimes you'll have a radio model that comes in VHF and UHF versions. The VHF version will do 5 watts, but then they'll often make the UHF one only 4 watts.

Why?

That's not always the case. Kenwood NX-300, NX-5300 and Icom F4161, F4261 put out 5 watts. And yes, those are the UHF handhelds. Somebody said he tested his Kenwood NX-300 and that it does 5.x watts.
 

ElroyJetson

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DO NOT ASK ME FOR HELP PROGRAMMING YOUR RADIO. NO.
It's mostly because at higher frequencies, output devices need more input power for a given amount of output power. They're less efficient at higher frequencies.

So, to keep the same battery life spec, a UHF radio typically has less power output than a VHF one,
and an 800 or 900 MHz radio has still less power output for the same battery life.
 
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