(Continued from Part 1.)
‘Sweeping’ a Band
If one can afford to buy several scanners, then that would be optimal. We should have at least three, given the old adage: “3 is 2, and 2 is 1, and 1 is none.” We can keep one spare scanner in a Faraday cage, and store it elsewhere. Then use the other two scanners: One to scan from a list, and the other to sweep the band, or particular parts of a band. Each scanner will have an operator’s manual to help. If I could only sweep one band, then it would be the 2 Meter Ham band, or sweep all the way from 144 Mhz to 162 Mhz as that is where most of the analog radio traffic will occur.
Advanced Methods of Scanning
Because my Area of Operations (AO) is remote, and where digital is seldom encountered, I put my meager resources into a bank of seven used analog scanners that each are utilized, together and separately, to intercept the most likely frequencies that might have traffic.
Scanners can perform in two different ways. They can be set up to ‘scan’, scrolling through hundreds of specific frequencies that have been programmed in, and to ‘sweep’ a band. Using a scanner to sweep a band, the scanner scrolls through all of the usable frequencies by bandwidth steps within a user-determined preference, that can be limited or expanded by the operator. If we are sweeping the entire VHF band, the time need to complete the sweep is extended to 3 to 4 seconds. If we limit the sweep, the time to complete a sweep is greatly shortened to one or two seconds.
Using several scanners to sweep different portions of the VHF band ensures coverage of that portion of the spectrum, and greatly increases the odds of interception. The technique pretty much eliminates the need for a frequency counter that is marketed as Uniden’s Close Call feature, and the range at which interception can occur is much greater than the Close Call feature allows. And we have the advantage of capturing the frequency even if the dispatcher attendant is distracted, or not present. If we used a digital recorder’s VOX function, we can also capture the traffic, and the frequency as it can remain displayed until the user resets the scanner.Continue reading“A Scanner for TEOTWAWKI – Part 2, by Tunnel Rabbit”
