How is VHF range calculated?

A typical VHF station operates at about 100,000 watts and has a coverage radius range of about 60 miles.Aug 13, 2020
VHF communication systems are the most widely used systems for maintaining contact between ground and aircraft. This uses the “Line Of Sight” transmission, which translates to a range of approximately thirty miles for aircraft operating at 1,000 feet above ground level, or approximately 135 miles for aircraft operating at 10,000 feet.

How far can VHF transmit?

Your VHF radio is intended mainly for short range communications, generally 5-10 miles, and at least 20 miles to a USCG station. To communicate at longer ranges, you will normally need a satellite telephone or an MF/HF marine radiotelephone.

How far will a 25w VHF radio range?

Boaters often mount radios with the legal limit of 25 watts and, depending on the height of the antenna, can reach communication distances as far as 60 miles or more. Everyone on the water should have a marine radio, however not everyone needs that much power while enjoying water activities.

How far will a 5 watt VHF radio transmit?

So according to our rule-of-thumb, 2 people around 6 feet tall using a 5 watt handheld two-way radio, used on flat ground with no obstacles, will have a maximum range of approximately 6 miles.

What is the range of VHF frequency?

This band is commonly referred to as the "Victor or VHF" band. The frequency range is from 118 MHz to 136 MHz.

image-How is VHF range calculated?
image-How is VHF range calculated?

How far will a 50 Watt VHF radio transmit?

Double this to give 11.2 miles. This assumes that both stations are at the same height above sea level. If one station is higher than the other, the answer will be greater than 11.2 miles. Providing that there are no obstacles between the two stations (buildings, hills, mountains, etc.)


How far can 400 MHz reach?

Thus the typical ranges with around 400 MHz frequency range with 1 W transmitter power are up to ~30 kilometers and up to ~80 kilometers with 10 W transmitter power.Aug 23, 2019


Which is better VHF or UHF?

VHF has smaller frequencies which means interference with other radios is common. UHF, on the other hand, is an all-around better signal for long distance communication. UHF is better when using radios for indoor use like buildings or around cities.Mar 12, 2019


HOW FAR CAN 2 way radios transmit?

Many consumer radios advertise a 30-mile range, but the truth is that most basic consumer radios will not provide anything near this distance. On average, a standard two-way radio is capable of communicating around half of a mile to 2 miles.Apr 21, 2015


How far can a 10 meter radio transmit?

"SHORT SKIP" on ten meters is usually around 500 miles or less and normal skip propagation "Sky Wave" can vary from a thousand to several thousand miles and around the earth. During the height of a sun spot cycle, signals can be heard both near and far for a large part of the 24 hour day.Feb 23, 2007


What is the frequency range of VHF and UHF?

In the United States, the frequencies used for these systems may be grouped into four general bands or ranges: low-band VHF (49-108 MHz), high-band VHF (169-216 MHz), low-band UHF (450-806 MHz), and high-band UHF (900-952 MHz). VHF represents “Very High Frequency” while UHF represents “Ultra High Frequency.”Dec 11, 2020


How far can UHF transmit?

Add obstructions or interference, and most UHF two-way radios have a realistic range of between 1 to 4 miles.Feb 11, 2014


What is the major limitation of VHF radio?

What are the Limitations of VHF and UHF portable radio communications? The most common limitation of VHF/UHF technology is that it requires Line of Site (LoS) between transmission points. Whilst there are many tracks where this is not an issue, Kyalami is a challenge.Oct 30, 2016


What is the difference between UHF and VHF frequencies?

  • The difference between UHF, ultra-high frequency, and VHF, very high frequency, is that the frequencies used in UHF are much higher than those in VHF. Both, however, are relatively high frequencies for radio waves as the names imply.


What is the frequency range of radio waves?

  • Radio waves range from 300 gigahertz (GHz), or a wavelength of 1 millimeter, to 3 kilohertz (kHz), which corresponds to a wavelength of 100 kilometers. Radio waves are the lowest frequency within the electromagnetic spectrum. The wavelength is the distance from the peak of one wave to the next.


What is the wavelength of radio waves?

  • Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies as high as 300 gigahertz (GHz) to as low as 30 hertz (Hz). At 300 GHz, the corresponding wavelength is 1 mm, and at 30 Hz is 10,000 km.


Which handheld marine VHF radio?

  • ICOM IC-M93D Marine VHF Handheld Radio. Maximum Coverage – This VHF marine radio allows operation of channels in the US,Canada,and internationally at 1,3,or 6 watts with ...
  • Standard Horizon HX890 Handheld Radio
  • Uniden MHS335BT VHF Marine Radio. ...
  • Uniden Atlantis 155 Handheld. ...
  • ICOM M25 21 Handheld VHF Radio
  • Cobra MRHH350FLT Floating VHF Radio. ...


What is the range of a marine VHF radio?What is the range of a marine VHF radio?

Marine VHF radios operate between 156 and 172 MHz, a sliver of the very high frequency band of radio waves between 30 and 300 MHz.


What is the formula for VHF range?What is the formula for VHF range?

The formula for VHF range taught in flight schools 1 is. $$ d = 1.25 * sqrt{h} $$. where d is the range in nautical miles and h is the height in feet of the receiver above the transmitter.


What is a very high frequency (VHF)?What is a very high frequency (VHF)?

VHF (Very high frequency) is the ITU term for the range of radiofrequency electromagnetic waves (radio waves) that are from 30 to 300 megahertz (MHz). Today’s VHF’s are not the same as those of 20 years ago. Today the VHF is competent in sending digital messages or calling specific stations into your radio (Digital Selective Calling – DSC).


What is the range of a visual VHF radio wave?What is the range of a visual VHF radio wave?

VHF radio waves propagate mainly by line-of-sight, so they are blocked by hills and mountains, although due to refraction they can travel somewhat beyond the visual horizon out to about 160 km (100 miles).

Share this Post: