History of Police Scanners

by GuestPoster on December 29, 2010

Police scanners can be traced all the way to the 1930’s. Back then, the police were using AM radio stations to broadcast all their emergencies. This broadcasting mode was pretty open to anyone who had a simple radio. As a result of these, the communications were not really safe. The radio system works on a variety of frequencies which form the communication channels. The scanner was an invention that was made purely to counter this problem. In order for you to listen in on scanner transmissions, you have to program some specific channels into your scanner. The very first scanner had only four channels and it was Chrystal controlled. In order for you to get the transmissions, you’d have to tune in to a particular frequency through the use of a quartz Chrystal. This would then have to be plugged into some kind of an internal slot. Each of these crystals would go for around $7. This eventually made them very expensive to maintain.

Then came the programmable scanners in the 1970’s which were equipped with a keypad for keying in the frequency of choice. This was followed by the trunked radio system which enabled the user to have access to up to thirty frequency channels. These systems were managed by site controllers. Different groups of interest were assigned different frequencies. This system allowed for the use of multiple channels switching in between a single conversation. Currently there are police scanner codes that are used by the police. They make use of the digital trunk scanner technology where a computer is used to encode voice transmission into data streams which are then decoded by a receiver so that the end result is a Chrystal clear voice.

The modern communications equipment needs an excellent filtration system that will keep them free of dust particles that are prevalent in the air. This ensures that the delicate interior components are kept in a good working order. These filters are needed even in places where cleanliness is strictly observed. The filters for this kind of equipment are widely available in various sizes, shapes and materials. There is a perfect fit for any type of machine that you may be using including the police scanners the age of the equipment notwithstanding.

Some of the most common filters are the windowpane air filter and the honeycomb air filter. They are mostly manufactured using the quadrafoam material which also acts as a form of machine soundproofing mechanism.

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