Antenna of vertical polarization of IV-V TV ranges “Collinear”
PURPOSE AND STRUCTURE
Antenna is used for TV broadcasting in one channel of IV-V TV ranges under vertical polarization of radiating field. Structurally antenna is a
collinear aerial array from coaxial vibrators protected from thunderstorms. From external actions the aerial array is protected by radio transparent covering. Antenna is installed on the top of a tower or a roof of a high building. If necessary, antenna can be installed on the band of the bearing (tower) by means of brackets.
In order to give directivity to the antenna at horizontal surface reflector is used.
Amplification constant of the antenna increases approximately at 2 dB.
Lightning protection is provided by direct bonding at direct current of the antenna with the earthing loop of the bearing.
|CHARACTERISTIC||Modification of the antenna|
|Working frequencies band||470 – 790|
|The bond of the working frequencies, MHz.||28 within the range|
|VSWR at the strap of working frequencies||? 1,2|
|DD at horizontal surface||Circular or directed|
|Feed impedance, ohm||50 (75)|
|Input connector||Upon customer’s choice|
|Quantity of active vibrators||4||8|
|Amplification constant relative to isotropic radiator under circular DD, dB||8||11|
|Total input capacity, kW||2||5,0|
|Height of the antenna, mm||2300-3400||3200-5300|
DD in horizontal surface
DD at vertical surface