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ANTENTOP- 01-2004
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Antenna Theory
Basic Methods in Antenna Measurements : 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 a Lecture about Basic Methods in Antenna Measurements. I believe, you cannot find such info anywhere for free! Very interesting and very useful info for every ham, for every radio- engineer.
Antenna Practice
Modern Military HF- Antennas of Communication Cars: by Igor Grigorov, RK3ZK
The basic types of military antennas, which for a long time were used on communication cars, were construed during and before the World War II. After WW-II researches for new antennas for communication cars was renewed. Below we shall consider two new type of car antennas which have appeared in army after the World War-II still are in use on modern communication car. There are magnet antennas and DDRR antennas, that began to be used for communication cars (under my information) rather recently - in the middle of 70s years of the 20 century.
Practical Design of Open- Sleeve Antennas for Upper HF- Ranges: by Dmitry Fedorov, UA3AVR
Just practical design of Open- Sleeve Antennas
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Something about Antenna Tuning Units: by Igor Grigorov, RK3ZK
You should not think that an Antenna Tuning Unit (ATU) is a magic thing to do any antenna work well with your transceiver. At installation between the transmitter and feeder the ATU only does matching of output impedance of your transmitter with input impedance of your antenna - feeder system. It means that ATU allows to the transmitter with output of 50 Ohm to work normally with antenna plus feeder having any input impedance.
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Antenna Tuning Unit for 6-meters: by Igor Grigorov, RK3ZK
For experimental operation on the 6-meters range some antennas for others bands with ATU can be used, especially if a radio amateur only starts to work on the "magic" band. Schematic of such ATU that does match any antenna of 10-20 meters to 6-meters is shown on Fig. 1. The ATU allows match a load of 15 to 1000 Ohms with 50- Ohms coaxial cable or with end stage of the transceiver. Efficiency is not less than 70 %.
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UR5LCV's YAGI for Hams: by Igor Zel'din, UR5LCV
Antennas from here were designed and optimized by Igor Zel'din, UR5LCV, and design of the antennas were wrote in the book: HF- Antennas- 3, by I. Beketov, UR4LTX, I. Zel'din, UR5LCV, Kharkov, 1994. 10 years has gone from the publishing of the book, for this time lots of these antennas became well- known to hams of the CIS. Lots of these antennas are practically made and have shown full conformity to the theoretical parameters.
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UR5LCV's YAGI for 28-MHz: by Igor Zel'din, UR5LCV
Just practical design.
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UR5LCV's YAGI for 21-MHz: by Igor Zel'din, UR5LCV
Just practical design.
UR5LCV's YAGI for 14-MHz: by Igor Zel'din, UR5LCV
Just practical design.
UR5LCV's YAGI for 7-MHz: by Igor Zel'din, UR5LCV
Just practical design.
UR5LCV's One Boom YAGI: 3-el 14-MHz & 4-el. 21-MHz: by Igor Zel'din, UR5LCV
Just practical design.
UR5LCV's One Boom YAGI: 4-el 14-MHz & 5-el. 21-MHz: by Igor Zel'din, UR5LCV
Just practical design.
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UR5LCV's One Boom YAGI: 4-el 21-MHz & 5-el. 28-MHz: by Igor Zel'din, UR5LCV
Just practical design.
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UR5LCV's One Boom YAGI: 5-el 21-MHz & 6-el. 28-MHz: by Igor Zel'din, UR5LCV
Just practical design.
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A Helical Loop Antenna for the 20-meters Band: By Vladimir Kuz'min, UA9JKW
Two years back I have moved to Nefteyugansk (Russia, Siberia) where I could not receive the sanction to installation for a full-sized HF- antenna on the roof of my house. , So I began to do experimenters with short indoors antennas.
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Top Load at Vertical Antennas
All amateurs know if at a vertical antenna a top load it is used, the self -resonance of the vertical antenna would be lower then a vertical without the top load. How a top load does influence to antenna resonance?
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A Five Bands Vertical Trap Antenna: by M. Chirkov, UL7GCC
The classical W3DZZ antenna in vertical installation designed by UL7GCC is well known in Russia.
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QRP
QRP-Tales: by Alexei Rusakov, UA4ARL/qrp
Continue from ANTENTOP- 03- 2003, # 004
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A QRP-QSO without an Antenna: by Oleg ("Master-72") V.Borodin, RV3GM
October 5, 2003. Robin, M5AEF, had an unique CW QSO with RX3BO from Moscow at 17 meters using only 1 watt output. You say 'it is nothing especial for 17 meters', but what do you say, if you know that Robin did not use any antenna?
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A Simple SSB Transceiver: by by Ashhar Farhan
A dual-band transceiver with a crisp receiver and a clean SSB signal is described. It started its life as an investigation of the excellent S7C receiver described in EMRFD. This transceiver was specifically designed to use components that are easily available in TV and Radio spares shops. The receiver sports an above average dynamic range, very clean signal and noiseless performance. Although the components are easily available, and every detail about making it is covered here, this is not a weekend project. The design is elaborate and invites improvisation.
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History
The USA Patents of Nicola Tesla
Just list of Patents
The Strange Life of Nicola Tesla
Nikola Tesla is the true unsung prophet of the electric age; without whom our radio, auto ignition, telephone, alternating current power generation and transmission, radio and television would all have been impossible. Yet his life and times have vanished largely from public access. This autobiography is released to remedy this situation, and to fill this black hole in information space.
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Last update: August 11, 2007 21:52