Wednesday, April 30, 2014
Friday, April 11, 2014
Car antenna for the 144-146 MHz
In one of the amateur radio magazines Russia was published scheme homemade car radio for range 144-146 MHz antenna also for this station . Well, since my blog about the antenna I decided to show you this antenna . And so I had not considered a thief to start write in what magazine was published this scheme automotive radios and antennas respectively for her magazine is " radio ham " 1992 , № 5 . (In Russian) . As can be seen quite unpretentious dish , but its size makes it clear that it is much more effective than in the smaller antenna . This car antenna for the 144-146 MHz range includes : vibrator coil , a magnet , a pair of insulators , it all (except the vibrator ) is placed in the body. The antenna is connected to the transmitter via a coaxial cable with an impedance of 50 ohms. The coil is wound silver-plated wire , wire diameter 3 mm, 4 coils has a diameter of 30 mm and stretched to a length of 40 mm. In the upper part of the housing is an insulator that is inserted into the vibrator antenna coil connected thereto , it is also inserted into the lower outlet in the insulator and connected to the center conductor of the coaxial cable. Below is an insulator under the magnet , whereby car antenna mounted on the roof of your car . Braid is soldered to the body of the antenna. Tuned antenna with a coil , compressed or decompressed its coils antenna configured directly on the roof of the car in the place where it will be located permanently in this place need to change the antenna tuning in section 144-146 MHz . In the presence of the auto antenna tuning devices easier and more tochnoy.Vot and all descriptions . Successful if you travel far and qso.73! yet !
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