Beam Angle of RADAR Type Level Transmitters

If it isn't in the manufacturer's instructions, the answer can be found by making a telephone call to them.

Lower frequencies tend to bend around the Earth and bounce off the atmosphere, i.e., AM & Ham Radio. Higher frequencies go in a straight line, and are relayed forward by repeaters and satellites to cover the planet, i.e., towers with all types of dishes and antennas hanging off of it. Lower frequencies are used in oceans, and all frequencies can be used above ground level. Basic electronics.

@Guest-

I appreciate your attempt towards my question, but this looks to be more related with communications & electronics. Frankly, no instrumentation engineer uses satellites for local level measurement. they have gauges/controlnet/ethernet for this purpose.

anyways, by reading your answer i have some doubts.

1) why lower frequencies tend to bend around the earth & how higher frequencies travel in a straight line? what is the exact reason?.

thank you,

Amey D

The ionosphere is a level in the atmosphere where the suns rays ionize the assorted molecules of air. The radio waves are not bent around the earth, but the ionosphere acts as a mirror for low frequency communication. The radio waves bounce off the ionosphere and come back to earth at a different location.

As a simple example, I might be talking to someone in New York. I happen to be on the West Coast. A person in Colorado would not hear my transmission because my signal would be high in the atmosphere as it went over Colorado. This is known as "skip", and Colorado would be in the skip zone.

Such communications is very dependent on the time of day, solar activity, frequency, and other factors.

With VHF and higher frequencies, the signal just punches through the ionosphere and off into space it goes.

I would suggest you look up "HF Radio wave propogation" on wiki for more information on the subject (as a guess).

Bill