Hey Dano
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I am not sure what you mean by the five frequency coverage- it is a bit unusual to have one system cover that many frequencies simultaneously- like others have said. A radius as small as you want to cover doesn't seem to be too difficult; even for the simplest of repeaters--- It is unusual you'd want a repeater for so small a area when simplex might do very well.
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All that aside, how do you plan to use this system? Is the repeater to be located on an elevated site, as in line of sight to the mobiles? Will it have to talk thru buildings, thru foliage? And of course, what is your budget...?... quite a few variables to consider, and it is hard to give a definitive answer on what you have provided.
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All that being said, I have a suggestion for something to consider. This is about the simplest, most inexpensive repeater- and I have had real life experience with it.** I hesitate to suggest this for I know the hoots and hollers it will produce... but I have had remarkable success with it- all things considered. It is a:
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"SainSonic RPT-12D Two-way Radio Repeater Box for Two Motorola Transceivers, Station"
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This is a simple audio controlled interface for two transceivers...... twenty-some dollars from Amazon. It is anything but a full fledged repeater- and limitations on such a system are beyond the scope of my missive. However:
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I will tell my experiences and let the readers draw their own conclusions.
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Awhile ago I purchased a box full of BaoFeng UV5 transceivers for work. After handing them out, sometimes multiply, there was still quite a few left in that box. Ever-the- curious, I had seen that SainSonic interface on Amazon and, bought one on a lark (no taxpayer's money, this one, guys.) About 2 miles from my lab is an unused hilltop antenna ranging site with an equipment shed and AC power. I took two of the BaoFeng transceivers up there, connected them with the interface, placed them in the shed- using battery pack eliminators and an AC power supply-- and I connected each transceiver to separate external antennas. These antennas were simple quarter wave verticals; the receive, on the top of a 20 foot tower- the transmit, just outside the shed door. Every thing from there is line of sight for at least 5 miles. The frequencies I chose were 408.xxx In, 418.xxx Out - mirroring the amateur 440 band. About as simple a setup you could ask for.
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The Results?
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It was hardly a Motorola repeater- But, and that is a "but' with an exclamation mark (!)- it did work surprisingly well. Of course there were things to adjust, as there always are- and your mileage may vary (YMMV- I like that abbreviation
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Okay, (laughing)... let the criticism begin... I can hear the rumblings already. But Dano, you asked for suggestions- and I work in the concrete-practical.... and here is one.....Good luck Cowboy!
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................................................CF
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** this was but an experiment- it was on the air long enuff to prove its worth-- now its all back in that box,
I also realize this is not the standard in/out, off set frequencies- etc... standards to gov. channels...