There are numerous ones out there. The TA-312 is most popular and quite reliable, however they are going up in price and are becoming scarce. There are some foreign military stuff out there as well, German, Russian, Yugo. They usually run off of 2 "D" cell batteries. To hook them up you'll need a 2-1 wire type. Polarities do not matter, range on these are 14 to 22 miles! That's allot of wire.........you can use just two field phones together or you can get a switchboard (SB-22/PT) if you can find one they aren't cheap, maybe $300. They run on "D" cells also if I'm not mistaken. With an SB-22 switchboard you can wire in up to 12 phones.
So if you are thinking of setting up a BOL on a large piece of property or securing a neighborhood, this could be a solution. Your switchboard at your Command center. Field phones at you LP/OPs. set your watches and secure you perimeter.
Here's an example of what you can do:
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This has a Yugoslavian TLCi-10 switchboard. But it didn't cost me $300, I found it for $86. Since it came without a handset, I wired a H-60/PT handset and it works just fine. I'm going to replace the surplus 6 pin plug with a commercial one and solder in the whole thing and I'll be down town.
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This is a typical USA set up. Hope all this helps anyone who is interested, and answers some questions.
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