Low noise antenna could be used at environment with
interferences from car and home appliances. Figure 1 show the design of the Low Noise HF- Antenna for HF- Band 16- 50- meters.
of two cross- dipoles that are connected with receiver through
twisted two- wire cord. It is possible to use usual main wire
with twisted (artificially) wires.
However, it is better to use special RF- Twisted cable.
Such cable was produced at the USSR at trademark RD- 16
The antenna has almost omnidirection
diagram of directivity. However, stations that are in orthogonal
direction (compare to the antenna wires) should be received better
then stations that are in parallel (compare to the antenna wires)
Good result at strong interferences could be provided
antenna shown in the Figure 2.
Antenna wire is hanged up at height 10- 12- meters
between two masts. Feeder of the antenna has cross-wires. At strong
interferences part of the feeder, that it is placed in the zone
of the strong interferences, may be made like feeder for antenna
Antenna coupled with the receiver with help of a special
symmetrical coil that is placed at the beginning and at the end
of the input inductor of the receiver. Each part of the coil consists
of 2…4 turns of the wire in diameter 0.5- 0.8- mm (24- 20- AWG).
Figure 2 One Wire Low Noise HF- Antenna
Considerable lowering of the noise the antenna (Figure
2) provides at 80 and 160- meters.