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ANTENTOP- 02-2010
See you at FDIM- 2011
See you at FDIM- 2011
Antenna Theory
Aperture Antennas - Part I : 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… .
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).
Underground Antennas in Russia
Some information about Underground Antennas from a Russian Forum at www.cgham.ru
Russian Military Antennas. Some Data
Russian Military Antennas. Some Data
Conical Windom Antenna: by N. Tyutin, UA4QA, Kazan
Credit Line: Radio 1951, # 4, p. 39
Simple design of a Conical Windom Antenna
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
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.
Asymmetrical I.V. for the 80 and 40- meters: by Nikolay Kudryavchenko, UR0GT
Asymmetrical I.V. for the 80- and 40- meter band
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
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.
11
EH- Antenna from 1928
Just design of a Prototype of the EH- Antenna from 1928
57
12
Low Noise HF- Antenna
Just design of a Low Noise HF- Antenna
TV- Antennas
59
TV- Antenna from Reused Beer Cans
A practical design of a TV- Antenna made on the base of the Beer Cans
60
Unusual TV- Antenna
Just design of an unusual TV- Antenna
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
Directional Antenna for 434- MHz: by Nikolay Kudryavchenko, UR0GT
Design of a Directional Antenna for the 430- MHz
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
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
QRP - TRANSCEIVER
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.
HISTORY
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.
Soviet Spy Radio "Sever"
Description, schematic and antenna of the Soviet Spy Radio "Sever"
PROPAGATION
Some Notes about LDE from G- QRP-C Forum
Just some interesting messages on subject "LDE" from the Forum of the G- QRP- C
PATENTS
Underground Antenna
Just a description of the patent
Tuning System for Tower Antennas
Just a description of the patent
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Last update: July 23, 2011 22:34