08-23-2006, 09:10 AM
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Join Date: Dec 1969
Location: South Otago
A good way to find out, is put a watt meter after any splitters and amplifiers and before the antenna. Take this real power reading and then calculate the antenna's gain on top. You're in Invercargill aren't you? I know a few people with watt meters down there who work for the big boy broadcast installations.
Dave, you've struck it lucky. Radio Specturm Management field testing officers always keep tabs on transmissions and their strengths. Even in rural towns they make 2-3 monthly visits and keep tabs on things.
I've had them knock on my door for 300mW once and they didn't know me or where I lived from a bar of soap. They don't need a black helicopter, just the MED company car, laptop and a few connected receivers. Triangulating a signal is to hard a work, it's just as easy to disconnect and antenna as you get closer to the source until you see the antenna on the roof then go knock on the door and deliver general user radio licenses to those who don't have one, or fine those not following the rules.
I've seen the odd second hand bird watt meter go on trademe, some have the 2.4ghz inserts with them, keep an eye out, they are very valuable for rf work.