4. Unpretentiousness to close located subjects.
5. Simplicity in manufacturing and adjustments.
6. Possibility to create phased àíòåííûå
systems on the basis of the antennas.
7. 50 - Ohm coaxial cable feeding.
8. Stability to heavy icing and to winds in 10-20 meters per second..
4 Ovals Antenna
responded all of the conditions.
Why an oval? At first, from the antenna theory we know
that an oval radiates energy a little bit more effectively than
a square. At the second, in practical, it is more easy to do an
oval then a
square.. So choose the OVAL! Figure
1 shows a design of the
antenna. Boom is made of iron L-plate 25x25-mm.
All the four ovals are fastened to the boom by struts made of
insulation stuff such as tree, hetinax, etc. Antenna is fastened
by the tail, that is behind the struts.
of elements (ovals):
Reflector- 727-mm. (-20-mm for soldering).
Driven Element- 653-mm (+10-mm distance for a RF socket).
Director-I- 649-mm. (-20ìì).
II - 639-mm.
2 shows the design of the Driven Element.
RF socket is soldered directly by the ends of the oval.
Three holes is drilled at each strut.
One holes is in the center for fastened the strut to the boom,
two holes are at the ends for bimetal oval. Antenna reflectors
and directors have the same design as the Driven Element only difference is its
ends soldered together.