The parameter that often calls electric length with in transmission line (unit: MHZ) the electric function that will measure cable. When the factory produces cable, because of the relation of workmanship, make the electric index of each batches cable

With the misshapen memory of the method that magazine of old to electron describes, the periphery that I think to the method that introduces by this uses closet door makes a kind super casing antenna . I do not know what the wire of this antenna is,

The technical development of mobile antenna is very rapid, original China basically is used common directional and complete to model mobile antenna, use mechanical antenna generally later, the mobile net of city of a few provinces has begun to use re

As family expenses car popularize the addition with radio lover, the person that adds outfit radio equipment in oneself car is increasing, how does a problem that produces subsequently install these equipment ably namely. Popular in radio group a suc

Shortwave communication is to point to wavelengh 100 - 10 meters (frequency is 3 - 30 MH ｚ ) the radio that electromagnetic wave undertakes corresponds. Shortwave communication transmission channel is had change ginseng is characteristic, ionosphere

The parameter that adjusts satellitic antenna focal length basically has part of azimuthal, angle of elevation, polarization these 3 parameter, among them azimuthal can be calculated with angle of elevation through receiving the longitude and latitud

1, dB dB relative value is a characterization of the value of the ratio of pure, only that the relative size of the relationship between two quantities, no units, when considering the power compared to a B or a small number of large power dB, accordi

As a result of the swift and violent development of mobile, at present a lot of countrywide areas are put in the situation that much net coexists, namely net of A, B, G3 coexists, the G net that has some of area among them still includes GSM9000 and