July 26, 2008
Why do two way radios have VHF and UHF options on purhcase?
What is the difference between them?
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Product Description
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Product Features
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22 channels, each with 121 privacy codes for 2,662 combinations
32 hr. alkaline (3AA) or 11 hr. NiMH estimated talk time
IVOX hands-free communication without the need of an audio accessory
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Technical Details
Brand Name: Motorola
Model: T8550RCamo
Item Package Quantity: 1
device_type: FRS/GMRS Unknown modifier
radio_channels: 22-channel Unknown modifier
Talking Range Maximum: 95040 feet
call_alerts: 10 Unknown modifier
voice_operated_transmission: With optional accessory Unknown modifier
Display: LCD display
Battery Average Life: 11 HoursUSD 55.99
Filed under Other - Electronics by admin
Comments on Why do two way radios have VHF and UHF options on purhcase? »
Totally different bands.
as i believe one is very high frequency the other is ultra high frequency
VHF is around 100-150 mHz while UHF is around 400 mHz. Used to be that receivers and transmitters built for those different frequencies varied so much that you could only get one band or the other. That’s still true for the most part.
There is also LB (low-band) which is down around 25-50 mHz. That’s where CB (children’s band) radios operate.
These frequencies carry long distances and sometimes bounce off the ionosphere (skip) to be heard around the world. The higher the frequency, the shorter the wavelength and the more line-of-sight characteristics come into play.
VHF is 30 MHz to 300 MHz.
UHF is 300 MHz to 3000MHZ.
Microwave is generally considered to start at 1000 MHz but the 1000 MHz to 3000 MHz part is still technically UHF.
For some reason the frequency bands were divided at 3. See the link below for a complete listing.
Most radios don’t do both bands. You buy either a VHF radio or a UHF radio. There are some radios, mostly ham radios, with both bands, but you have to make sure the radio has this ability before you purchase it.
Among other things, there are differences in coverage and building penetration between the bands. VHF will cover a greater distance than UHF with the same power. UHF will penetrate a building better than VHF because it has a shorter wavelength and will get through better because of this. Sometimes one band is used because there aren’t any open frequency in the other band.