Trace Radio Object For Free

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Two-way radios, also known as walkie-talkies, remain popular even after the advent of cell phones. Police and security forces, the armed forces, event managers, hunters and many others use them. Two-way radios are extremely difficult to trace. 2 way radios are difficult to trace.
A tracking transmitter broadcasts a radio signal which can be detected by a directional antenna (typically a Radio Direction Finder.) By rotating the antenna one can determine the direction the signal lies in and of course whatever it may be attached to. The EPIRB is an example of a similar device.
An object can be located by measuring the characteristics of received radio waves. The radio waves may be transmitted by the object to be located, or they may be backscattered waves (as in radar or passive RFID). The use of multiple receivers to locate a transmitter is known as multilateration.
It's technically possible to detect radio receivers if they are Superheterodyne receivers that use RF mixing to downmix the received signal to a well known intermediate frequency. You can scan for this frequency using a directional antenna and count the receivers around you.
Yes, humans, under special circumstances, can hear radio-frequency pulses in the range of 2.4MHz to 10GHz (corresponding to radio frequencies and microwave) as buzzes, clocks, hiss or knocking at apparent auditory frequencies of 5kHz and higher (very high-pitched).
You are right that radio signals do degrade over distance in space. However, unlike our atmosphere, there are very little to block radio signals in space, which lets it travel much futher in space without degration.
Your signal can be tracked. It's known as DF (Direction Finding) in the amateur radio world. Hams have made a sport of it which is called Fox Hunting. When it comes to an Amateur Radio license in the US, yes you can be tracked by that since it's public record.
Two-way radios, also known as walkie-talkies, remain popular even after the advent of cell phones. Two-way radios are extremely difficult to trace. 2 way radios are difficult to trace.
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