Already familiar to readers of foreign author Sparks31 writes about conducting radio intelligence by several people directly at the scene. Clearly, specialized equipment, starting with rtl-sdr TV tuners and further to professional devices.
It should be noted that it is necessary to determine the frequency of the radio frequency spectrum. In the typical range from 25 MHz to 1.3 GHz.
In the United States of America, it makes it possible to find out about 99% of cases. The main source is FCC internet resource, Federal Communications Commission. This is a list of the coordinates of the coordinates. It doesn’t apply. This method also will not actively be used in this place. To find out the field surveys in order to operational monitoring.
The most common tool used for operational frequency determination for nearby sources of radiation. They are known by trade names. “Close Call” (manufacturer Uniden / Bearcat), Signal sweeper (Whistler) and “Signal Stalker” (Radio Shack). They are “CC / SS”. If you’re a radio operator, use the CC / SS function. More frequencies will be detected first. Less active will require more time to search. In the case of the CC / SS It can be secretly left in place and retrieved later.
The following are the disadvantages of using CC / SS:
- overlap of the scanner itself;
- certain digital signals.
Digital frequency frequency counter, such as Optoelectronics Digital Scout. It has an overlap in frequency from 10 MHz to 2.6 GHz. TDMA, GSM, frequency hopping, APCO 25 (P25) signals, amplitude shift keying, TETRA, RF signal signals. It can track an RF burst of 300 microseconds in length and understands almost any modulation. DMR and NXDN (IDAS / NEXEDGE) signals are not included in the specification.
The author has experimented with the definition of near-field signals since Radio shack # 22-305 in the mid-1990s. Over the past 20 years, his hands have passed Radio Shack frequency meters, products Optoelectronics, scanners with CC / SS. It is a scoring frequency meter.