Product technical data
Product name::VHF dual dipole TV transmission antenna
Equipment model:ZRVHF-2O
Equipment origin:Jiangsu
Manufacturer:Confucianism Nanjing Radio and Television Equipment Co., Ltd
One.Product function introduction
1.Antenna material
the outer tube of antenna vibrator is made of "304" high-quality stainless steel tube with a wall thickness of 2.4mm; The conductor and feed system in the antenna are made of high-quality H62 brass silver plated; The reflective plate is made of 304 high-quality stainless steel pipe with wall thickness ≥ 2mm; All connecting bolts of antenna are high-quality stainless steel; The reflecting plate can withstand the trampling of the installation workers, and the pipe diameter and mechanical strength can ensure that no permanent deformation or damage will be caused when the wind speed is ≥ 200 km/h;
2.
Power distributor material
the outer conductor is made of high-quality H62 fine-drawn brass tube with nickel plating, and the flange is also made of copper with nickel plating for corrosion protection; The inner conductor is high-quality H62 fine-drawn brass tube with silver plating treatment;
3.
The power distributor adopts 90 ° phase shifter technology; Input impedance is 50 Ω;
4.
Insulation material: polytetrafluoroethylene;
5.
Installation components: high-quality A3 steel hot-dip galvanized;
6.
Antenna installation connecting bolts: high-quality 304 stainless steel bolts;
7.
The antenna feeder system will charge dry air into the whole feed system until the antenna dipole input port.
8.
The whole set of antenna has undergone pressure test, waterproof and anti-rust treatment. Joint sealing: Our professional and technical personnel operate sealing treatment on the tower. Waterproof treatment is equal to the following requirements: place vulcanized sealing ring in the antenna joint; The installation of antenna connector shall be filled with waterproof thread sealant; Wrapped with waterproof self-adhesive tape for outdoor use; Finally, the rubber heat-shrinkable sleeve is used externally for heat shrinkage.
9.
Waterproof structure treatment of antenna unit: our company adopts effective sealing and waterproof treatment. The middle of the vibrator of the antenna unit is crimped and sealed with high and low temperature resistant polytetrafluoroethylene thread encryption sealing ring, which is anti-smashing and anti-cracking, to ensure the waterproof performance of the antenna unit.
10.
Airtightness of the antenna feeder system: our company fills the input end of the main feeder cable of the antenna feeder system in the transmitter room with dry air at the pressure of 30 kpa, and the drop is less than 5 kpa in 24 hours.
11.
DC resistance and insulation resistance of antenna feeder system:
(1) DC resistance of antenna feeder system: 100 m, not more than 0.1 Ω;
(2)Insulation resistance of antenna feeder system: main feeder, power distributor, sub-feeder, etc. (in case of no short circuit point) shall not be less than 500M Ω, and antenna unit (in case of no short circuit point) shall not be less than 50M Ω.
The feed structure of antenna unit is simple, without short circuit clamp to adjust the standing wave ratio, with good consistency and high efficiency. The antenna radiator is integrally welded, with high mechanical strength and strong wind and water resistance. The interface of antenna unit is IF45 flange, which has large power capacity. The middle of the vibrator is crimped and sealed with polytetrafluoroethylene (plastic king) thread, which is resistant to high and low temperatures, smashing and cracking, and aging. Even in severe weather conditions such as strong wind and ice coating, the antenna will not be damaged, resulting in a broadcast outage. This antenna is particularly suitable for high-power mountain stations in harsh weather conditions.
All indicators of the antenna system comply with the standards of GY/T 5088-2013 Technical Indicators and Measurement Methods for Television and FM Broadcasting Transmission Sky Feeder System.
Two.
Technical parameters of antenna system:
1.Antenna form: VHF dual dipole TV transmission antenna;
2.
Frequency range: 167~223MHz (available in full frequency band);
3.
Polarization mode: vertical polarization (or horizontal polarization);
4.
Antenna feeder impedance: 50 Ω.
5.
Standing wave ratio: within the range of 167~223MHz, at the input end of the main rheostat of the antenna system (excluding the main feeder) ≤ 1.05; At the input end of the antenna feeder system (including the main feeder) ≤ 1.08.
6.
Antenna gain: G4 layer 4 ≥ 7.6dBd, unit board gain: 7.3db.
7.
Antenna power capacity and interface: antenna system power capacity ≥ 1-30KW;Antenna unit interface: 7/8 ″ flange (IF45-50K)/L27-50KF/L29-50JF;Branch feeder model: 7/8 ″;Antenna system input interface: 3 1/8 ″ flange (IF110-50K);
8.
Antenna field type
(1)
Antenna horizontal plane field shape: out-of-roundness <± 3dB;
(2)
Vertical plane field shape: according to the altitude of the antenna and the service area, the electrical dip, the first zero point filling > 10%;
(3)
Provide horizontal and vertical field diagrams, and meet the coverage requirements according to user requirements and tower position antenna parameters.
9.
Mechanical property requirements
(1)
Maximum wind speed>200km/h;
(2)
Operating ambient temperature: - 50 C ° -+80 C °
(3)
Applicable relative humidity: < 95%, dewy, ice wrapped;
(4)
Maximum sea level:>2000m;
(5)
Ensure normal operation under severe weather conditions such as storm, snow and dense fog.
Three.
Antenna vertical and horizontal field pattern
Unit board simulation diagram
VHF dual-dipole TV transmission antenna electromagnetic field simulation diagram
Waterproof structure treatment of antenna unit
Effective sealing and waterproof treatment shall be adopted, including the waterproof treatment of the antenna unit's vibrator equal to or better than the following requirements: the center of the antenna unit's vibrator shall be crimped and sealed with a thread sealing ring made of polytetrafluoroethylene, to ensure that the antenna unit has the waterproof performance of high and low temperature resistance, impact resistance and crack resistance.
Airtightness of the antenna feeder system: fill the input end of the main feeder cable of the antenna feeder system in the transmitter room with dry air at the pressure of 30 kpa, and the drop is less than 5 kpa in 24 hours.
DC resistance of feeder system: 100 m, not more than 0.1 Ω;
Insulation resistance of antenna feeder system: main feeder, power distributor, sub-feeder, etc. (in case of no short circuit point) shall not be less than 500M Ω, and antenna unit (in case of no short circuit point) shall not be less than 50M Ω
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