HF antennas of quasi-zenith radiation for near communication

HF antennas of quasi-zenith radiation for near communication

HF antennas of quasi-zenith radiation for near communication
VNPU HF antennas is a band zenith nondirectional antenna providing HF radio communication via ionospheric wave for long distance paths up to 300 km.
Its modification - 2VNPU antenna allows for HF radio communication both in circular zone up to 300 km and in sector zone (60° wide) for distances up to 750 km.

Area

Purpose of the equipment

Completion

VNPU (2 VNPU) HF antenna set includes: mast, additional racks, antenna cables, wire suspension rigging, resistive load, lightning protection system, SPTA.
Balun and a set of mast warning lights can be ordered separately.

Main technical characteristics:

Service area:
- for antenna VNPU
- for antenna 2VNPU


circular for distances up to 300 km
circular for distances up to 300 km and sectoral – up to 60 wide for medium distances up to 750 km in upper area of operating frequency range
Operating frequency range main multiple of 2, allowable multiple of 6 within the range 2,0-24 MHz
Operation modes Receiving or transmission а
Allowable power of radio transmitting set up to 1000 W
Input resistance of antenna feeder device
– without balun
– with balun

600 600 Ohm (symmetrical)
50/600 - 50 Ohm (asymmetrical)
SWR for antenna feeder input no more than 3 regarding the W=50 Ohm
Connection to radio device HF cable via detachable balun-50/600
Radiation characteristics:
- antenna gain Ga
- radiation polarization

1,0 … 4,0 dBi
horizontal
Operation conditions:
- maximum wind load
- operating temperature range


дup to 40 m/s without icing
up to 20 m/s with icing with ice thickness up to 10 mm from – 50 to + 55°С