Narrowband Data Radio Modems | Narrow Band Dataradios

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	Narrow Band Data Radio UHF and VHF data radios using 12.5kHz (narrow band) or 25kHz (wide band) channels have been used for voice and data radio communications since the middle of the last century. They are called narrow band because the regulatory bodies such as the FCC limit the signal bandwidth to a very narrow spectrum. This allows a lot of radios to utilize the band. For example, 450-470MHz frequency band has 1600 narrow band radio channels. Even though narrow band radio has been around for over a half of century, it is still one of the most efficient ways to transmit data over miles of terrain. Wide band radios are available that hav much higher data rates and operate on much higher frequencies, but they cannot come close to meeting the communication range and reliability of a narrow-band radio link. Read AN119 for technical details about the various common frequency bands. In the USA, and in many other countries, the 150-174MHz and the 450-512 MHz range are used for commercial wireless communications. Raveon has data radios in these bands: VHF: 136-155MHz, 150-174MHz UHF: 403-433MHz, 419-440MHz, 450-480MHz, 480-512MHz

Narrow Band Data Radio

UHF and VHF data radios using 12.5kHz (narrow band) or 25kHz (wide band) channels have been used for voice and data radio communications since the middle of the last century. They are called narrow band because the regulatory bodies such as the FCC limit the signal bandwidth to a very narrow spectrum. This allows a lot of radios to utilize the band. For example, 450-470MHz frequency band has 1600 narrow band radio channels.

Even though narrow band radio has been around for over a half of century, it is still one of the most efficient ways to transmit data over miles of terrain. Wide band radios are available that hav much higher data rates and operate on much higher frequencies, but they cannot come close to meeting the communication range and reliability of a narrow-band radio link. Read AN119 for technical details about the various common frequency bands.

In the USA, and in many other countries, the 150-174MHz and the 450-512 MHz range are used for commercial wireless communications. Raveon has data radios in these bands:

VHF: 136-155MHz, 150-174MHz

UHF: 403-433MHz, 419-440MHz, 450-480MHz, 480-512MHz

VHF and UHF Radio Frequencies

The most common narrow band radio modem bands used worldwide are the Very High Frequency (VHF) band and the Ultra High Frequency (UHF) band. Raveon provideds data radio modems in both bands.

VHF and UHF each have unique advantages and disadvantages to them. UHF has a much shorter wave length, so the antennas are more compact and less obtrusive. The antenna my be as short as 16cm and work very well. VHF antenna are typically 3-times larger than UHF, but in many instances, the communication range will be greater with a VHF system. The price one pays for the lower frequency with larger antennas may be worth it because the communication range is greater or the system can use less RF power to achieve the desired results.

In open areas, users will often find that a VHF data radio communicates furthur then UHF data radios. But in heavily wooded areas, indoors, or rough terrain, UHF data radios may work better. UHF signals penetrate foliage better, and will reflect off of rock and other obstructions quite well. UHF may also work indoors a little better than VHF and it penetrates buildings better.

For more details about Raveon's UHF data radio products, click on the Products link above or visit
http://www.raveontech.com/Products.html