gm300 radio interfacerepeater1.jpg
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This is a GM 300 used together as a repeater system, this technology was the first step towards the discovery of microwave links, using the UHF frequency and by a means of directional antenna to a point to point repeater link, the means of this way of communication is a duplex communication system. without this radios, yet cellphones might not be in the market place right now. or might never been introduced to the public.
