Igor VE3KAO
When
I served in the Soviet Army I had contact with a military radio
station that was used such Underground Antennas. The station was
from Sverdlovsk (now Ekaterinburg). My station
was near Moscow.
(I.G.: Distance Moscow- Sverdlovsk is 1800 km.) We used band 3.0- 6.0- MHz at the winter and 4.0- 8.0- MHz at the
summer. The station with Underground Antennas was heard by S5-
S6. When the station was used the usual stationary antennas it
came to us by S9+.
I
asked the chief of the radio- center about the Underground antennas.
He told me that he saw how the antennas were installed. It was thick
coaxial cable that was buried in trenches in 2.5- 3.0- meter depth... |
yl2gl
The
Underground Antennas were at the receiving radio- center where
I was served (in the Soviet Army). There were symmetrical antennas.
The antennas were reserved ones that supposed to be used at emergency
situation (at nuclear war)...
UA9FBQ
I
took part at installation of the Underground Antenna.. It was coaxial
cable (looks like) near 10-cm in diameter. The coaxial cable was
buried on 50-cm into the ground. I used the antenna with a transmitter
"OKUN".
The antenna matched well but the efficiency was low. The antenna
was tested up to 6- MHz.
|