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ANTENTOP- 01-2011

 

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Antenna Theory

 

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Cylindrical Antennas - Classical Theoretical Models: by: Prof. Natalia K. Nikolova


 

5-24

Dear friends, I would like to give to you an interesting and reliable antenna theory. Hours searching in the web gave me lots theoretical information about antennas. Really, at first I did not know what information to chose for ANTENTOP.

Now I want to present to you one more very interesting Lecture - it is LECTURE 9: Cylindrical Antennas - Classical Theoretical Models.

Reciprocity theorem. Self-impedance of a dipole using the induced emf
method. Pocklington's equation. Hallen's equation...

 

 

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HF- Antenna Practice

 
 

2

 

Super Broad Band HF- VHF Antenna: Igor Lavrushov, UA6HJQ

 


 

25- 27

 

 

I desperately need in RX/TX antenna that could be work at HF- VHF bands without any tuning. The antenna should be work at any conditional and should be simple in design. Below you find description of my design of such antenna...

 

 
 

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Vertical for the 20- meter Band: by: Boris Krivosheev (R9WI ex RA9WFD)

 

 

 

28- 29

 

  The antenna design is based on the known “Bazooka” antenna...  
 

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Helical Antenna for 20 meters Band: by: Vladimir Semenov (RU4SJ)

 


 

 

30

 

  Antenna bandwidth 13.941- 14.504 MHz. SWR 1.0:1.0 at 14.207 MHz. The Helix Antenna was fed by 75- Ohm coaxial cable in 15.82- meter length...  
 

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Urban Antenna:by: Vladimir Semenov (RU4SJ)

 

 

31- 32

 

 

I have to use the antenna with a transceiver with RF- power 87- Wtts. Antenna was installed at a balcony in the second store of a multi- store building. Direction of the balcony is to the South. Antenna was tested at 80, 40 and 20- meter Band...

 
 

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6

 

 

 

Cylindrical EH- antenna
for the 20- meter Band: by: Vladimir Semenov (RU4SJ)

 


 

33- 34

 

  Design of a simple EH- Antenna for the 20- meter Band ...  
 

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7

 

Multiband Vertical Stub Antennas: by: Roman Sergeev (RN9RQ)

 

35- 37

 

  Before describing of the antennas I would like to talk why those ones were designed. At fall 2009 the Youth Collective Radio Station RK9QWN had to change room inside the building. Old antennas were removed because the roof was repaired. So it needed to install new antennas.
The question was- what should be the antennas like?
 

 

 

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Asymmetrical Trap Dipole Antenna: by: Roman Sergeev (RA9QCE)



 

 

38- 39

 

 

Ham knows and widely used to the Symmetrical Trap Dipole Antennas. Classical example of such antenna is W3DZZ antenna. At my opinion such antennas has just one benefit- patterns of the antennas are almost the same at the different bands. However, the antennas have lots disadvantages. There are heavy weight, complexity in design, large enough windage, the narrow bandwidth at the lower bands, high SWR at some bands.


Asymmetrical Dipole Antennas (that are used by hams) are free from some of lacks of the Symmetrical Trap Dipole Antennas. However the main lack of the Asymmetrical Dipole Antennas is the main lobe of the diagram directivity at lower bands is toward to main lobes at the other upper bands.


An antenna that is almost free from the disadvantages was design by me by combination of these two types of antennas- Symmetrical Dipole Antennas and Asymmetrical Dipole Antennas. I called the new one prototype "Asymmetrical Trap Dipole Antenna."

 
 

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9

 

Vertical Open Stub Antenna for the 40 and 20- meter Band: by: Nikolay Kudryavchenko, UR0GT

 

40- 42

 

  The antenna has enough good parameters at the 40 and 20 meter Bands. Antenna does not need any counterpoises. Antenna should place at some distance (say more the 1- meter) above the ground. To prevent radiation from the outer braid of the coaxial cable a good RF- Choke should be installed at the feeding terminals...
 
 

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10

 

Wire Antennas for the 160 and 80 meters: by: Nikolay Kudryavchenko, UR0GT

43- 48

 

  The both antennas have resonance at 160 and 80- meter bands. There are hi- ohmic antennas, so, these ones need an ATU for the feeding. .  
 

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11

 

 

MOXON for 15 and 10- meter Bands: by: Nikolay Kudryavchenko, UR0GT

 

 

49-51

 

  It is just Optimized Moxon for the 15 and 10- meter Bands.  
 

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AN

 

Antenna “Strela”: by: UA4SZ Valery Kiselev

 

52- 55

 

 

Antenna Strela (in transcription from Russian it means “Arrow”) is a modification of the well-known dipole antenna Bazooka that is widely used by hams.

However antenna Strela is contained less stuff for manufacture, antenna Strela is lighter then antenna Bazooka. Antenna Strela has good matching with the coaxial cable and SWR of the antenna on the working Band looks like better then Bazooka could provide there...

 

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13

 

 

Efficient Field Low Height Dipole Antenna
for the 20- meter Band
: by: Igor Lavrushov, UA6HJQ

 

56- 59

 

 

  The antenna was designed for using in a mountain hiking where the main requirement is a low weight and high efficiency at the limited stuff around there.  
 

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VHF- UHF- Antennas

 

 

14

 

YAGI for 145.5- MHz: by: Valery Kiselyov (UA4SZ)

60

  Simple design of a vertical YAGI antenna for the 2- meter Band  
 

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15

145- MHz J- Antenna with no- Mast RF Current: by: Nikolay Kudryavchenko, UR0GT

 

61- 66

  It would be very conveniently if a J- Antenna would be grounded to the metal mast. However there is a problem with an RF- current leaking from the J- Antenna along the mast. It is a very simple method to block the current...  
 

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16

Fuchs Antenna for the 2- meter Band: by: Vasily Perov DL1BA (ex UK8BA)

 

67

  The antenna was made and tuned while only 30- minutes. It needs a 126- cm length of wire in 3- mm diameter (9- AWG)...  
 

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17

 

 

 

 

Low Profile Antennas for the 435- MHz Band: By: Nikolay Kudryavchenko, UR0GT

 

 

 

68- 74

 

 

  Description of some low- profile antennas for the 435- MHz - Band...  
 

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18

 

145/435- MHz Vertical Dipole Antenna: By: Nikolay Kudryavchenko, UR0GT

 

75- 77

 

  It is widely known two band antenna was a little modified to reach good SWR at the two working bands- 145 and 435- MHz...  
 

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Two Bands 144/430- MHz Antenna: by: Vladimir Semenov, RU4SJ

 

78

 

 

  It is very simple two bands antenna that do not require tuning when it made according to the design...  
 

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HISTORY

 

 

 

 

20

 

 

Regenerative HF- Receiver of the Beginner Radio Amateur: by: L. Nikolaev, Radio #2, 1958, pp.: 20- 23

 

79- 82

 

  Description of a simple HF-Regenerative HF- Receiver for the Beginner Radio Amateur...  
 

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Underground Antennas of the Military Radio Center and Missile Silo: Credit Line: Forum at www.cqham.ru

 

 

83- 87

 

 
Description of some real Underground Antennas of the Russian Military Radio Center and Missile Silo
 
 

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22

 

Wish You Were There... Hamvention- 2011 and FDIM- 2011

 

88- 89

 

  Some memorable papers from Hamvention- 2011 and FDIM- 2011...  
 

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PATENTS

 

 

 

23

 

Stub Matched Antenna and Method the Feeding Same

 

90- 97

 

  Just Description of Patent of "Stub Matched Antenna and Method the Feeding Same."  
 

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24

 

Sound Powered Radio Transmitter

 

98- 100

 

  Description of Patent of a Sound Powered Radio Transmitter  
 

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Last update: March 29, 2016 9:32