non licenced radio transmissions

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jospjn
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non licenced radio transmissions

Post by jospjn »

Hello,

In the case that a person is transmitting illegally or as a pirate radio can the authorities dedect where the transmission point is coming from?

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Jos.
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djhubbalubba
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Post by djhubbalubba »

Yes they can..
jospjn
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Post by jospjn »

Hi how can they? is it by detecting the antenna or there can be something indicating
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djhubbalubba
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Post by djhubbalubba »

They use an instrument and detect where the signal is coming from.
stormfm
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Post by stormfm »

a pretty simple method would be an RF meter and a yagi. see which direction gives the best signal, then draw a line on a map corresponding with that. then go to another location and do the same. the intersection of the two lines is where the transmission is coming from. BTW does anyone know if AM is hard to track?
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Low Power Radio Guy
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BTW does anyone know if AM is hard to track?

Post by Low Power Radio Guy »

AM is quite easy to track, as well. In fact, the old marine direction finders sold years ago (before loran C and GPS) used land based AM stations for reference points. Any signal that can be received can be tracked, it's just logical, really. Spread spectrum is a bit harder because the tracker won't know which freq to track, but that's not used for broadcast, so...

This is why lots of folks use STLs - the main transmitter is located remotely from the studio or audio source and the STL, frequently using a non-broadcast band freq with a very narrow pattern antenna, is often pointed up in the air to the main transmitter. This makes it much more difficult to track the source of the audio - the transmitter can be found but not the people operating the transmitter.
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Post by pcs »

True, but they usually don't even bother with AM since you usually need a complaint
and that pretty much never happens with AM.
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