# ANTENTOP- 02-2004

 Cover +Contents 410 KB (Cover + Editoroal + Cotenst (pp.:1- 4 ))

Antenna Theory

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Introduction into the Theory of Radiations : 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 Introduction into the Theory of Radiation. I believe, you cannot find such info anywhere for free! Very interesting and very useful info for every ham, for every radio- engineer.

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HF Antenna Practice

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Field Universal HF Antenna RV3DA: by Igor Grigor'ev, RV3DA

Russia summer traditionally is the season for radio expeditions. So, the question about a field antenna stands before hundreds radio amateurs. Certainly, it is impossible to give one answer to this question. A design of an antenna for fields depends on many factors. There are frequencies bands used by radio expedition, local factors for antenna installation, time and money and so on. Igor, RV3DA, has developed universal wire antenna. This one with ATU works well on all amateurs short-wave ranges, including WARC. factors. There are frequencies bands used by radio expedition, local factors for antenna installation, time and money and so on. Igor, RV3DA, has developed universal wire antenna. This one with ATU works well on all amateurs short-wave ranges, including WARC.

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Shunt Vertical Universal HF Antenna: by Igor Grigorov, RK3ZK

Field universal antenna RV3DA (see pp.:24- 35 of ANTENTOP- 02- 2004) works well even at a bad grounding. To hammer into the ground a metal rod in 1 meter length is enough for the grounding. Installation of the antenna takes a little time, it is another its advantage.However, if there is an opportunity to provide a good ground, and there is some free time to spend of for installation of an antenna, it is possible to use a Shunt Vertical Universal HF Antenna .

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Multirange Trap Antennas: by Igor Grigorov, RK3ZK

Recently multirange trap antennas are widespread among radioamateurs. As matter of fact, the type of antennas was invented in the USA by H. K. Morgan, US patent # 2229856, 1938 (by reference [1]). Probably the first article about a trap antenna was published in reference [2] at 1940. So, what is the antenna and how is it work? Let's see it on the example of a ham vertical trap antenna in order to simplify a problem. Figure 1 shows us a schematic of such antenna.

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Log Periodic Antenna for 21, 24, 27, 28 and 30- MHz: by S. Ershov, UW3TU

The Log Periodic Antenna works at 21, 24, 27, 28 and 30 - MHz. As all antennas of the type, the LPDA is easy tuned and works with a high efficiency. The antenna contains additional directors for 21 and 28- MHz and reflector for 21- MHz.

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Soviet radio amateurs well know the broadband dipole named in Russia "dipole Nadednenko." The antenna is widely used at serve radio centers of Russia. Russian radio amateurs also are used the dipole. Below we take up a design of the antenna.

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VHF Antenna Practice

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Forgotten Antenna : by Igor Grigorov, RK3ZK

Some of former USSR's radio amateurs still remember the "TV spherical antenna". Earlier, at 60- 70s the antenna was rather widely used for reception of TV. What is the "TV spherical antenna"?

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Antenna for 900 MHz: by Petr Gritcay, US1REO

I have got a radio telephone DAEWOO DWP-5000 working in a range 900-MHz at the radio market in Kiev . I checked up the phone with its antennas. I could reach only 300- 350 meters when the phone saw the radio base. I need 2 kms communication range. I decided to increase the communication range of my radio phone by using an effective antenna.

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Feeders

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Losses of RF Power when Feeder works at SWR mode: by Igor Grigorov, RK3ZK

If a feeder has a characteristic impedance differ compare to the load a part of RF power going from the transmitter in the feeder is reflected from the load back to the transmitter. In this case the load uses a part of RF power of the transmitter. Table 1 shows the losses of RF power when a feeder has SWR.

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Interferences

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An absorbing Filter: by Igor Grigorov, RK3ZK

At ANTENTOP - 2, 2003 it was described a trap filter on main wires. However, the filter cannot be used at a high power or at super- broad bands transmitters. One reason is that it is impossible to retune a trap at a wide frequency range, other reason is the trap filter does reflection of the high-frequency energy back. So, wire to the filter can radiate also the high- frequency energy goes to transmitter and does additional interferences. So, in some case a trap filter can do more trouble the use.

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Free Radio e- BOOKS in the Internet

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Crystal Sets to Sideband:Contents and Path to Free e- book

Dear friends, I have read the book with great interest. The book really captivates and I cannot tear myself away the book. The book contains 16 very interesting chapters, and every chapter says us a separately story about radio. I can strongly recommend to you have read this book. Below you can see the Contents of the book and path to load this one.

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Antennas for Radio Amateurs:Contents and Path to Free e- book

If you can read in Russian you can download a free e- book "Antennas for Radio Amateurs" by Igor Grigorov, RK3ZK. The book is e- variant of a paper book with the same title. Paper book contains 256 pages and was issued in 1998 in Russia. One fragment of the book was translated in the English and was published at ANTENTOP- 1, 2003. Other fragments of the book also going to translated in the English. Below you can see the Contents of the book and path to load the Russian variant.

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History

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Russian Transceiver EFIR: by Igor Grigorov, RK3ZK

Transceiver Efir was produced since the end of 70s of the 20 Century. Functional chart of the transceiver was the same as UW3D1- 2 transceiver had. However, Efir was made all of semiconductors, it did not contained any tubes. Transceiver Efir was produced for Soviet collective amateur radio stations, but sometimes, hams can buy Efir for private amateur radio stations.

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UW3DI- the Timeless Transceiver: By Igor Grigorov, RK3ZK

Schematic of the transceiver UW3DI at first time was published in 1970 at a Soviet ham magazine "Radio" # 5-6. The transceiver was named UW3DI by the callsign of its author, Jury Kudrjavtsev. Jury probably did not ever suspect, that his transceiver would be the most popular transceiver in the USSR and tens thousands copies of the transceiver would be made by Soviet hams.

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Russian Districts Award: credit line http://rdaward.org/rda_eng.htm

RDA" (Russian District Award) is an International Awards Program with the goal of attracting interest in Amateur Radio through the communication with various Districts in the Russian Federation. The "RDA" program is established to encourage confirmed contacts with the greatest variety of areas in Russia. There are currently 6 different certificate awards varying in difficulty and complexity, and two plaque awards available for "Honor Roll" and "#1 Honor Roll".

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Old Receiving Magnetic Loop Antennas: by Igor Grigorov, RK3ZK

Receiving magnetic loop antennas were widely used in the professional radio communication from the beginning of the 20 Century. Since 1906 magnetic loop antennas were used for direction finding purposes needed for navigation of ships and planes. Later, from 20s, magnetic loop antennas were used for broadcasting reception. In the USSR in 20- 40 years of the 20 Century when broadcasting was gone on LW and MW, huge loop antennas were used on Reception Broadcasting Centers (see pages 93- 94 about USSRs RBC). Magnetic loop antennas worldwide were used for reception service radio stations working in VLW, LW and MW. The article writes up several designs of such old receiving loop antennas.

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The First Steps (Part- I): by Vitaly Brousnikin

Vitaliy says us a story about beginning and the First Steps of Russian radio industry

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The First Steps (Part- II): by Vitaly Brousnikin

Vitaliy says us a story about beginning and the First Steps of Russian radio industry

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Useful Data

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Wire Metric Diameter/Gauge Standard

Just a table for transfer Number # (AWG, BWG and SWG) to diameter in millimeter.

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 Lightning Links to Open Book Antenna Theory Helical Antennas Useful Pieces Simple Keys Antenna Practice TV Antennas Propagation QRO HF Tube Amplifiers 136 kHz- Antennas Coaxial cables LDE QRO HF Transistor Amplifiers HF- Antennas Two wire lines Interferences QRP HF- RX Antennas Feeder's Toolkit Filters TVI/RFI QRP PA 50- MHz Antennas HF ATU Homebrew Receivers Radio and Ham History VHF- Antennas ATU for the 6- meters Homebrew Transmitters Old Russian/USSR Radio Equipment UHF -Antennas Antenna Parts Matching Circuit for P.A Amateurs Awards EH- Antennas Antenna Towers QRP Transceivers Free Radio and Electronics e- Books TV Channels and Frequencies Reception of Weather Stations Useful Data FM Radio Channels and Frequencies MagLoop Antennas Home-Brew Technics in Antenna Tools PSU for Amateur Radio from Computer Free Programme and Utility

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Last update: February 4, 2018 22:24