ANTENTOP-
01- 2011, # 015
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Asymmetrical Trap Dipole
Antenna
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The MMANA models
of the antennas may be loaded: http:
// www.antentop.org/015/ra9qce_015.htm
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The models should be
checked in the utility NEC2 for MMANA. The utility may be loaded
from the link at Reference
5.
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Figure 2
Pattern of the Asymmetrical Trap Dipole Antenna installed at height
30 meter above the ground
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Adjusting of the antenna is usual for such kind of the antennas.
At the 40 meters antenna is tuned to the resonance by proportional
changing of the length of two wires before trap for the 7- MHz.
At the 80- meter the antenna is tuned in to resonance by wire
between trap for 7- MHz and 3.5- MHz. At the 160- meter the antenna
is tuned to resonance by the length of the wire after trap to
the 3.5- MHz. (See Figure 1)
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Similar to the antenna from the Figure 1 it is possible to make
two band antennas. Figure 3 shows Asymmetrical Trap Dipole Antenna
for the 80 and 160- meter Bands. Dimensions are for the height
of 15- meter above the ground. The antenna may be fed directly
by coaxial cable 50 or 75 Ohm. RF choke installed near the feeding
terminal of the antenna would be very useful. The choke may be
made as several turns of the coax above any ferrite ring.
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Figure 3 Asymmetrical Trap
Dipole Antenna for the 80 and 160- meter Bands for 80 and 160-meter
Bands.
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References:
1. http://forum.qrz.ru/showthread.php?t=12762
2.
http://forum.cqham.ru/viewtopic.php?t=17233
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3. http://dl2kq.de/soft/6-6.htm
- Trap-rus
4. http://cqham.ru/trx84_11.htm
5. http://dl2kq.de/mmana/4-8.htm
- NEC2 for MMANA
73! Roman Sergeev (RA9QCE).
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www.antentop.org
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