Very High Frequencies (VHF) have been used for voice and data radio communications since the middle of the last century. Bands withing the frequency range of136-174MHz are used throughout the world for reliable wireless data communications.In the United States and in many other countries, the 136-174 MHz range is used for commercial wireless communications. Raveon has data radios in these bands:A)136-155MHzB) 150-174MHz
VHF Radio Frequencies
The two major data radio modem bands used worldwide are the Ultra High Frequency (UHF) band and the Very High Frequency (VHF) band. Raveon provides data radio modems in both the VHF and UHF bands.
VHF and UHF each have advantages and disadvantages to them. There is no one best band. VHF antenna are typically larger that UHF, but in many instances, the communication range will be greater with a VHF system. UHF has a shorter wave length, so the antennas are more compact and less obtrusive.
UHF signals may penetrate foliage better, and will reflect off of rock and other obstructions very well. UHF will also work indoors somewhat better than VHF and it penetrates buildings better. In open areas, most users will find that VHF data radios communicate farther than UHF data radios. But in heavily wooded areas, or rough terrain, UHF data radios may work better.
Raveon has many types of VHF radio modems.
The RV-M21 Tech Series of radio modems has a myriad of IO options and many features.
The RV-M8 OEM Radio Module is a low cost high performance HF Radio modem module designed to be incorporated into your products that need reliable and secure data communications over VHF radio channels.
For more details about Raveon’s VHF data radio products, click on the Products link above or visit