Radio Wireless

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Wireless Switch 6CH Momentary Remote Relay Receiver    US $19.90

1000m 4CH Wireless Radio Transmitting Module TM1000 4S    US $4.00

Wireless Switch 1CH Latch Remote Keyfob Relay Receiver    US $9.00

Wireless Switch 2CH Toggle Remote KeyfobRelay Receiver    US $14.00

4CH RF Wireless Receiver Module RM4SHS FCC Compliant    US $9.90

Wireless Security Door Window Alarm Alert Protection    US $6.50

Craftsman Fingerprint Keyless Keypad 53555 379LM 53753    US $24.99

4000m 4CH Wireless Radio Transmitting Module TM4000 4    US $18.00

Liftmaster 371LM garage remote control    US $10.51

1 to 12 System RF Wireless Radio Switch RemoteReceiver    US $95.00

Brand New GE Simon XT Wireless Alarm System    US $99.00

Wireless Radio Receiver Module SuperPower Saving RM1SGS    US $2.00

Estate Swing Wireless Cellular GSM Telephone Intercom    US $405.00

Wireless Radio Switch 2CH Latch Remote Relay Receiver    US $9.90

Wireless Switch 1CH Toggle Remote KeyfobRelay Receiver    US $9.00

Powerhouse X10 Home Security System    US $29.99

Craftsman Sears Wireless garage dr Keypad 13953754 01    US $5.95

Liftmaster 377LM Wireless Keyless Entry 315 MHz NIB    US $15.00

Wireless Security Door Window Alarm Alert Protection    US $7.50

X 10 Powerhouse Siren SH10A    US $5.95

Auto PIR Door Keyhole Pyroelectric IR Sensor LED Light    US $8.81

X10 Home Security System with Voice Dialer DS7000 NEW    US $59.99

Honeywell Ademco LYNX L3000 Wireless Alarm W 10 5816    US $299.95

WS4904P DSC Wireless Pet Immune PIR Motion Sensor    US $50.00

Lutron Aurora Wireless Lighting Control Fassada Plate    US $279.99

Lot of 10 Honeywell Ademco LYNX Plus Wireless Alarm    US $999.95

NEW Multi Code 1090 Garage Door Receiver    US $19.99

Wireless Driveway Alarm Motion Sensor WMA 3000    US $112.50

NEW Linear MegaCode Garage Door Remote MCT 1 MCT 2 MDR    US $12.99

DC12V GSM Anti theft Alarm Security System XY GSM 2    US $85.20

Honeywell Ademco 7845GSM Digital Cellular Communicator    US $51.01

Dakota Alert MURS BS HT KIT Long Range Driveway Alarm    US $343.95

Honeywell LYNXR 2 Wireless Alarm 5816 5804 5890PI LK    US $259.95

Ecobee EB STAT 02 Smart Thermostat System    US $349.00

CHAMBERLAIN 940D KEYLESSENTRY 377LM SUB 956D 370LM 953D    US $17.00

WMA 3000 Dakota Wireless Sensor Drive Alert 3000    US $112.50

LiftMaster 371LM Gate or Garage Door Opener Remote    US $16.25

Safety Siren LPG LNG Natrual Gas Leakage Detector Alarm    US $17.06

Liftmaster Chamberlain 371LM single Button Remote    US $12.90

Professional Wireless Home Security Alarm System    US $299.95

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there is a reserved band for radio, commercial use, pubilc use and for governament use.
in which our fm radio is tuned and reserved is for pubilc use. in which a frequency band is reserved and set to a perticular band to receive only radio channels( songs, new etc)
if you want to here police radio band then you need to assemble a radio in which you have to design the circuit.
or
there is one more way but i am not sure it will work or not,

inside your common radio on circuit board there are some small components called IFT (intermidiate frequency tuner) in which you can swap your band width to extent just tune those IFT's too slightly to change band width. use very small screw driver and they are minute grafite stones they may break if you use it roughly.

if you are a student of electronics and telecomunication you can do those things easily, if you are not then please don't try this you may spoil the radio and this may be offence and you can go to jail also.

Outlet Wireless Remote Wall Outlets (3 pack) List Price: $69.99 Sale Price: $23.56 Average Rating:

Features Use this remote control switch to control any lamps or small appliance plugged into an AC outlet Operates on radio frequency - will perform through walls, doors and floors up to 60 feet away; no line of sight needed. Plugs into any standard wall outlet Remote & manual operation. Power status indicator LEDs Includes one 12V battery for the remote Package contains: 3 Single outlet remote base units (Receiver unit), 1 Three-button hand held remote control (Sender unit), 1 12V battery (size 23AP), Operating Manual

	PetSafe PIF-300-11 Wireless Pet Containment System List Price: $299.99 Sale Price: $279.95 Average Rating:
	Features Wireless radio-fence containment system for pets weighing 8 pounds or more Covers an adjustable circular area of up to a 1/2 acre (180-foot diameter) Receiver delivers safe static correction when pet strays into warning zone Waterproof receiver collar uses 6-volt battery; setup and training manual included Transmitter measures 8-1/2 by 9 by 9 inches; receiver measures 1 by 2 by 1 inches

	PetSafe PIF-275-19 Extra Wireless Fence Receiver List Price: $179.99 Sale Price: $119.95 Average Rating:
	Features Compatible with PetSafe Wireless Fence system; best for dogs over 15 pounds Adjustable collar for optimal comfort; weighs 2-1/2 ounces 5 levels of electric correction and a beep-only warning mode Includes collar, receiver and PetSafe RFA-67 battery module

	Linksys by Cisco WEC600N Dual Band Wireless-N Ultra RangePlus Expresscard List Price: $87.99 Sale Price: $76.71 Average Rating:
	Features Features - High-speed Wireless-N (draft 802.11n) networking for your ExpressCard PCs - MIMO technology uses multiple radios per band to create robust signals for maximum range and speed, with reduced dead spots - Operates in the 2.4 and 5GHz radio bands -- choose the one with least congestion in your area - Also connects to Wireless-G, -B, and -A networks

	Radio Wireless Symbol Tshirt Sale Price: $17.95 - $18.95
	Features Radio Wireless Symbol Tshirt

	1971-74 Premodernist Wireless on Radio: Peel Sale Price: $39.97 Average Rating:

Yuasa 4-Pack of AA Ni-MH Rechargeable Batteries (2500mAh) List Price: $14.50

Features 4-pack of high capacity Yuasa AA 2500mAh Ni-MH rechargeable batteries Nickel-Metal Hydride (Ni-Mh) chemistry ensures up to 1000 recharges with no memory effect Batteries last up to 4 times longer than standard alkaline AA batteries on a single charge Works in any device that uses AA batteries and is ideal for high-drain devices Recommended for DECT cordless phones, wireless microphones, kids electronic learning systems

	8 truCELL AA NiMH Rechargeable Batteries from Accessory Power for Microsoft XBOX 360 Wireless Controllers List Price: $29.99
	Features Professional Quality - truCELL 2700mAh batteries last twice as long as Standard Alkaline Batteries, and 45% longer than 2000 mAh Batteries. A SafeGuard 3-Year Warranty means you're protected, no matter what. Excellent for power-intensive XBOX 360 Controllers Rechargeable up to 1,000 times Also, compatible with any other device that takes AA-type batteries, alkaline or Ni-MH

	Hitech - 2 C Size Rechargeable Batteries (4500mAh)
	Features 2 Hitech C Ni-MH rechargeable batteries. Chemistry: Ni-MH (no memory effect) ; Capacity: 4500mAh ; Voltage: 1.2V Provides longer run time for toy trains and other toys using C size batteries Cost saving than alkaline batteries Charges up to 300 times

	Honeywell RCWL300A1006 Premium Portable Wireless Door Chime and Push Button List Price: $49.99 Sale Price: $28.88 Average Rating:
	Features Wireless, battery operated Works with up to 3 push buttons, motion detectors or door contacts for added security and convenience Three chime tunes, fully adjustable volume and 3 visual alert icons Self learning code system automatically adjusts to eliminate interference 250-foot operating range

The Benefits Of Radio / Wireless Fire Alarm Systems

In these days the early radio or wireless fire alarm systems began to gain a poor reputation for reliability, mainly related to the radio transmissions and battery life of the devices.  However over time the technology involved in these systems has steadily advanced to where we are today.  Today's Radio or Wireless Fire Alarm Systems are light years ahead of their early 80's ancestors.  Interestingly the advance in technology with the radio fire alarm systems has occurred as a bi-product of major advances in technology in the computer, battery and mobile phone industries.  Radio Fire Alarm System designers and engineers have embraced and harnessed this technology to create a new generation of radio fire alarm systems that are much more sophisticated in terms of performance, fault monitoring and reliability.  These new systems are fully compliant to BS5839 and EN54 and are fully monitored.

One of the main benefits of Radio Fire Alarm Systems is that they reduce the needs to run cables to each individual device on the fire alarm system.  Modern radio fire alarm systems will only need cables to be installed to the control and signal booster panel positions to provide a mains supply.  This benefit of radio fire alarm systems means that have been ideally suited to listed type buildings.  It allows the installation of a fully functioning fire alarm system within the building while not ‘running' cables where it is impractical to do so.  Examples of installations of this type are in Windsor Castle and The Ritz Hotel, both of which have radio fire alarm systems installed.  In some instances conservation bodies would also prohibit the installation of cables within protected buildings and radio fire alarm systems may be the only solution to allow the building to comply with current regulations and standards.

Another huge benefit to a radio fire alarm systems is the vastly reduced installation times.  As each device is battery powered and does not require a cable to connect it to the fire alarm system, a single device could be installed in a room in around 30 minutes.  A hard wired alternative system would in comparison take weeks or months to install, greatly increasing the installation time and the amount of disruption within the building.  In a hotel for example installing a ‘hard wired' type system would take months to install.  It may be more cost effective to install a radio fire alarm system when the amount of ‘down-time' is taken into account i.e. the hotel may lose much more revenue in shutting areas of the building while the installation of a fire alarm system is taking place.

Due to the flexibility and ease of installation, radio fire alarm systems are also being used as temporary systems.  Some building companies for example use radio fire alarm systems on sites where fire detection is required whilst building work is on going.  These systems can be installed as the building work commences and be used on the project until the project is finished.  The system can then be simply taken down ready to be used on their next project.  The benefit of flexibility can also seen when using radio fire alarm systems on projects with phased construction works.  The devices can be simply added and removed as work is on going without having to add and remove cables and therefore speeding up the construction process.

The increase in reliability of Radio Fire Alarm Systems is now a huge benefit.  Radio Fire Alarm Systems have now been allocated a dedicated communication frequency to use.  In the past one problem with radio fire alarm systems was that they were using similar communication frequencies to other services, such as the radio communication with taxi companies for example.  This lead to interference with the two systems and false alarms occurring.  However now with the new dedicated frequencies this can no longer happen and as a result the systems are much more reliable.  The reliability of radio fire alarm systems is also dependent on a successful radio survey being carried out by a person trained to carry out a radio fire alarm survey.  This is to ensure that the building is suitable for a radio fire alarm system and also to ascertain where the fire alarm panels and signal booster panels should be installed.

Advances in battery technology have enabled radio fire alarm systems to become easier to manage in terms of maintenance.  As the devices on a radio fire alarm system are all battery powered, there is no escaping the fact that these batteries will need to be changed.  However radio fire alarm manufacturers are embracing new battery technology to increase the battery life of their devices.  Many radio fire alarm system manufacturers are now using lithium batteries.  These batteries have a much greater life span than the batteries that were traditionally used and many radio fire alarm manufacturers are quoting life spans of up to 5 – 7 years for the batteries used within their system devices.

In conclusion radio fire alarm systems if correctly surveyed and installed offer huge advantages over traditional ‘hard-wired' fire alarm systems.  Offering greater flexibility, reduced installation times and huge leaps forward in the reliability in the systems over the last 20 years.

About the Author

Fire alarm system equipment from The Safety Centre fire alarm system equipment collection.