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ANTENTOP- 02-2010

 

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Antenna Theory

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1

Antenna Noise Temperature and System Signal-to Noise Ratio: by: Prof. Natalia K. Nikolova

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 Antenna Noise Temperature and System Signal-to Noise Ratio.

The performance of a telecommunication system depends very much on the signal-to-noise ratio (SNR) at the receiver's input. The electronic circuitry of the receiver (amplifiers, mixers, etc.) has its own contribution to the noise generation. However, the antenna itself is a significant source of noise… .


5-15
 

 

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HF- Antenna Practice

 

2

 

Grounded and Underground Antennas

Just a Chapter from the book: Alpert, Bulatov, Runge: Antennas of the Third Reich: Published by Ministry of Defense of the USSR, Moscow, 1948. (Circulation: 300 copies).


16- 21
 

 

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3

Underground Antennas in Russia

Some information about Underground Antennas from a Russian Forum at www.cgham.ru

 

22- 23
 

 

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4

Russian Military Antennas. Some Data

Russian Military Antennas. Some Data

 

 

24- 31
 

 

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5

 

Conical Windom Antenna: by N. Tyutin, UA4QA, Kazan

Credit Line: Radio 1951, # 4, p. 39

Simple design of a Conical Windom Antenna


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6

Small Vertical for the 80- meter Band: by Nikolay Kudryavchenko, UR0GT

Optimized Vertical in 4- meter length for the 80- meter band


33- 34

 

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7

Multiband Asymmetrical Dipole Antennas: by Nikolay Kudryavchenko, UR0GT

Multiband Asymmetrical Dipole Antennas for 80/40/20/10 and for 80/40/20/15/10- meter Bands.

35- 44
 

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8

Asymmetrical I.V. for the 80 and 40- meters: by Nikolay Kudryavchenko, UR0GT

Asymmetrical I.V. for the 80- and 40- meter band

45- 47
 

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9

Vertical Inverted L for the 160, 80 and 40- meter Bands: by Nikolay Kudryavchenko, UR0GT

Vertical Inverted L for the 160, 80 and 40- meter bands

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10

EH- Antenna for the 160- meter Band: by Vladimir Kononov, UA1ACO, St- Petersburg

The antenna has diameter 110- mm and is 2 meter in length. The sizes are without protected enclosure (indoor variant). Antenna was calculated with help of program VK4ANW.

52- 56
 

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11

EH- Antenna from 1928

Just design of a Prototype of the EH- Antenna from 1928


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12

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Magnetic Loop from the 1928

Just design of a Magnetic Loop Antenna from the 1928

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13

Low Noise HF- Antenna

Just design of a Low Noise HF- Antenna

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TV- Antennas

14

 

TV- Antenna from Reused Beer Cans

A practical design of a TV- Antenna made on the base of the Beer Cans


 

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15

 

Unusual TV- Antenna

Just design of an unusual TV- Antenna

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VHF/UHF - Antennas

 

16

Dual Band Vertical for 145 and 430- MHz: by Nikolay Kudryavchenko, UR0GT

Design of a Dual Band Vertical 145/430- MHz


 

62- 64

 

 

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17

 

Directional Antenna for 434- MHz: by Nikolay Kudryavchenko, UR0GT

Design of a Directional Antenna for the 430- MHz


 

65- 67
 

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18

 

Vertical ZL- Beam Antenna for 430- MHz: by Vladimir Polyakov, RA3AAE, Moscow

I would like to make a simple directional antenna. After I had observed lots variants I stopped at ZL- beam with two elements with active feeding. The antenna looked very attractive for me. This one at its small sizes (only lambda/8… lambda/10 in length) was practically the same parameters as 3- element YAGI.

 

68- 69

 

 

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19

 

Simple Ways to Increase Communication Range of a Hand- Held Radio: by Igor Lavrushov , UA6HJQ

Several simple tips to increase the communication range of a hand- held radio with help of anything near by..

70- 73

 

 

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QRP - TRANSCEIVER

 
20

 

Transceiver Fetter - 80: by Dmitriy Goroh, Ukraine, UR4MCK

The transceiver is a practical implementation of the theoretical schematic made by RA3AAE [References 1, 2]. Transceiver was made on a piece of PCB of suitable sizes. Transceiver was made on 80- m band however, this one may be tuned to another ham band.

 

 

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HISTORY

 
21

 

QRP Membership Certificates

So it is ours history, ours old amateurs ID. I just would like to show some of old Amateurs Membership Certificates, certificates from international QRP Clubs.

77- 80
 

 

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22

 

Soviet Spy Radio "Sever"

Description, schematic and antenna of the Soviet Spy Radio "Sever"

81- 84
 

 

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PROPAGATION

 

23

 

 

Some Notes about LDE from G- QRP-C Forum

Just some interesting messages on subject "LDE" from the Forum of the G- QRP- C

85- 86
 

 

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PATENTS

 
24

 

Underground Antenna

Just a description of the patent

87- 94
 

 

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25

 

 

Tuning System for Tower Antennas

Just a description of the patent

 

95- 100
 

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Last update: March 29, 2016 9:24