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Microwave radio require free line of sight between point A and B. Any obstruction in the first Fresnel zone (imaginary ellipsoid zone between point A and B) will degrade the availability. Furthermore, rain attenuation is affect the transmission in frequency above 10GHz.

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What are the disadvantages of using a clockwork radio?

Not many disadvantages!You don't need electricity.You don't need batteries.You release no dangerous carbon dioxide emissions.You get a little exercise winding it up!


What is the origin of the word 'radio'?

RA radio D detecting A and R ranging == ==


What does phone mean in amateur radio?

Radiotelephone- that is voice talking ( called Phone for short) . The term , with the advent of cellular phones, which are in a very real sense radiophones- has engendered some confusion. Before their advent (Phone) in Amateur Radio use meant voice conversation- called Radiotelephone. The other major transmission mode was of course CW- Continuous Wave- that is, Code transmission- or radiotelegraphy. As of now, there are, of course , different types of licenses for Phone, and Code transmission. Prior to l992 there was an arbitrary Code test for ALL prospective amateurs. This ( Model T) requirement has been modified if one is using only Phone. Still there are the CW zealots.


What are the advantages and disadvantages of a DAB radio?

Advantages of DAB Radio over FM/AM radio's: 1) they automatically tune into all of the available radio stations and so do not need retuning 2) they can display extra information using PAD, such as the song title, artist name and general information about the radio station 3) there is a greater choise of satations 4) There is less interference, and does not have the crackle that you sometimes getwith an FM/AM radio 5) With the newer and better made DAB radio's, you can pause and rewind the radio station Disadvantages of DAB Rdio's 1) there is not world wide coverage, so many areas have poor or no DAB radio signal 2) They are much more expensive - you can get a normal radio for less than £10, but it is very dificult to buy a DAB radio for less than £25 3) Most cars still use FM/AM radio's, so if FM/AM radio was shut down and only DAB radio was used then about 2/3 of people would not be able to liusten to music in there cars.


Why when the radio is on it makes a screeching noise?

Possibilities include: tuner chip degrading; audio amplifier failing; other discrete component failure; AM is more sensitive to local radio interference than FM; microwave oven nearby; another radio, tv or computer nearby; surveillance bugs in area; wireless alarm systems; feedback from piggy-back radio using household power lines (which serve as the antenna system); proximity to high voltage power lines or radio/tv towers; or a local amateur radio transmitter in area.

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