Antennas for long distance paths

Antennas for long distance paths

Antennas for long distance paths
Antennas are designed to be used as part of radio centers for omni-directional and sector radio communication both with mobile objects and with radio route communication for long and medium distance paths
The set includes: vibrator antenna of various electrical modifications: VGD, UGD, VGD-2U and others.

Area

Purpose of the equipment

Additional equipment:

- signaling lights (low intensity obstacle light);
- antenna is equipped with lightning protection system.

There can be made any construction additions and changes at a customer’s request. All antenna masts are made using the advanced antenna technologies with various mast systems (refined steel, duralumin), guy-ropes and radiator cables (special rope in a protective anti-icing cover etc.). Mechanized fast mast lifting and lowering. A maximum antenna mast load – antenna weight ration is provided.

Radiation pattern of VNPU (2VNPU) antennas

- in the lower area of operating frequency range
- in the upper area of operating frequency range (only for 2VNPU antennas

Main technical characteristics:

Operating frequency range multiple of 2 (2,5)* within band 2–30 MHz
Allowable power 1 kW(5 kW)
* The figures given in brackets are possible values that depend on antenna modification
Antenna gain in zenith from minus 0,95 to +9,0 dBi
Travelling wave ratio at down-lead input no less than 0,3
Input resistance:
– input
– with feeder transformer
– with detachable balun

450 Ohm (symmetrical)
600 (300) Ohm (symmetrical)
50 Ohm
Polarization mostly horizontal
Connection to radio transmitting device aerial two-wire feeder W=600 Ohm or cable with W=50 Ohm
Carrier suppression in USB mode in J3E emission class no less than 40 dB
Frequency response flatness for SSB path no more that 3 dB
Non-linear distortions of the transmitting path no more that minus 36 dB PEP
Frequency tuning time to a programmed frequency no more than 50 ms
Frequency tuning time to a programmed frequency no more than 2 sec
Antenna operation with any given TWR provided
Antenna coupling with antenna feeder device TWR no less than 0.2
Reception mode
Operating frequency range 0.4–30 МHz
Service area
– circular
– sectoral

up to 300 km
up to 500 km (FWD-BWD up to 45° wide)
Wind load for the basic model I – III (up to VII)* wind region Russia, I – II (up to IV)* icing region Russia
Operating temperature range from minus 40°C (50°C)* to +55°С
* The figures given in brackets are possible values that depend on antenna modification
Construction dimensions
– height (H)
– height (h)
– width (W)

10–24 m
16–50 m
1.25 m
Service lifetime 20 years