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ANTENTOP- 01- 2011, # 015

Asymmetrical Trap Dipole Antenna

 

The MMANA models of the antennas may be loaded: http: // www.antentop.org/015/ra9qce_015.htm

 

The models should be checked in the utility NEC2 for MMANA. The utility may be loaded from the link at Reference 5.

 


Figure 2 Pattern of the Asymmetrical Trap Dipole Antenna installed at height 30 meter above the ground

 

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)

 

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.

 


Figure 3 Asymmetrical Trap Dipole Antenna for the 80 and 160- meter Bands for 80 and 160-meter Bands.

 

References:

 

1. http://forum.qrz.ru/showthread.php?t=12762

2. http://forum.cqham.ru/viewtopic.php?t=17233

 

 

  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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Last Updated:

August 2, 2016 8:58

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