The Family Radio Service (462 – 467 MHz) uses the Ultra High Frequency (UHF) band, a progress from the walkie talkies of way back then. You can buy these handheld radios anywhere but when using them, it competes with other intercom systems with similar range and conversations can be heard by others. There have been no wireless products that utilize FRS.
Nowadays, some cordless phones are using the 5.8 GHz range but they don’t have any murs radios wireless intercom systems so far. No need to worry if you want to mix 5.8GHz and 2.4GHz units for there are no compatibility issues between them.
“FM wireless intercoms” are said to be wireless but in fact just used the power wiring of the building in order to send or receive transmissions. Despite the name, transmissions are done in AM band over the house wiring. In order to use these intercoms, simply plug an AC adapter to the wall. A humming or buzzing sound will be heard when the murs radios intercom is in working status so many avoided buying this intercom. There are also signal problems when crossing the phases for the house wiring is in 240 volts and is divided in two phase of 120. This is the reason that one part of the building may work and other does not. This intercom is the cheapest intercom there is.
Long Range Wireless Intercoms
The newest wireless intercoms on the market use the MURS frequency which is in a Very High Frequency (VHF) 160 MHz radio spectrum. Compared to the FRS, MURS has four times the power and adding an antenna (larger or external) is possible to have more range. Manufacturers of antenna said that with an external antenna, the transmitter’s power is increased by a factor of 4. However with murs radios intercoms, you can do transmissions up to 4 miles, and greater if you use an external antenna.
No comments:
Post a Comment