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Henry Electronics UHF Amplifier

amplifier booster repeater

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#1 RCM


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Posted 29 January 2019 - 09:00 PM

I have a Henry UHF Amp model C25D02, 1-5 watts in, 25 watts out. I've had if for over 20 years; it was given to me by a retired police chief from California. I had never used it because I didn't have a use for it. The tuned center frequency is 464 MHz with a 10 MHz bandwidth. Perfect for GMRS but unusable for 70cm ham radio.


So now I have a use for it in my GMRS repeater. I mentioned it in another thread earlier today. It's perfect for my repeater because 5 watts is the minimum specified power setting of the Kenwood TK-805D I'm using as the transmitter. That will raise its duty cycle, although it's not bad at its current setting of 12 watts.

The amplifier is rated 50% duty cycle mobile and 100% duty cycle in a repeater, at 25 watts output.


I had no documentation on the amp. It is still a current model, so I was able to find some data on it from the Henry website.


I decided earlier this evening to email the company and ask about Part 95A type classification, and also asked if I could get a manual. I received an email reply within the hour from Ted S. Henry. He assured me that it is indeed type accepted, and attached a pdf of the manual.


Two thumbs up for Henry Radio! 

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#2 WPXM352


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Posted 07 February 2019 - 08:14 PM

That is certainly good to hear. I am building a new repeater and trying to comply with Part 95 . Finding a PA has been a worry. Aftermarket PA's are commonly used with Part 90 equipment and as such, I have not seen any concern as to specific certifications. It is the exciter that does the heavy lifting as to modulation emissions. The PA if well designed and terminated into a proper load should do fine.

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#3 WRAK968


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Posted 13 February 2019 - 02:06 PM

Typically from my understanding, Part 90 is allowed on GMRS mostly because the specifications are generally the same. If I recall, the main difference is that part 90 has a narrow band requirement while part 95 is wide band. The other difference is maximum power output, part 90 is 100+W while part 95 is 50W. As long as your part 90 equipment is set up with part 95 specs, you can usually get away with it.

Also tagged with one or more of these keywords: amplifier, booster, repeater

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