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ANTENTOP- 01-2008
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Antenna Theory
Polarization and Related Antenna Parameters : 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 Radiation from Infinitesimal (Elementary) Sources. I believe,
you cannot find such info anywhere for free! Very interesting and very
useful info for every ham, for every radio- engineer.
Radiation from an infinitesimal dipole. Duality in Maxwell's equations.
Radiation from an infinitesimal loop. Radiation zones.
Receiving Antennas
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Atmospheric Current: Practical Experiments: By V. T. Polaykov, RA3AAE, Ph. D in technical science
The Article describes some experimenters that prove the mysterious current
from the Broom Antenna
HF- Antenna Practice
Expedition Two Element Antenna for the 20-meter Band: By N. Filenko, UA9XBI
The antenna was designed for using at DX- peditions. Antenna consists
of two elements- mast in height 10 meters and in diameter 30-50-mm (it
is reflector) and a dipole for the 20-m (it is driver).
Simple All- Band HF- Antenna: By Eugene Erohov (US4EM)
Dream of each of amateurs working from a hard for antenna installation
conditions to have a small invisible antenna for all bands. I have tried
to solve the dream. My all band antenna is something middle between T2FD
and loaded Loop.
Rectangular UB5UG: By Yuri Medinets, UB5UG, Kiev
Rectangular shown at Figure 1 has good parameters and not so sensitive
to height (that is very important for low amateurs HF-ranges) compare
with dipole. Upper horizon wire is broken by a nut insulator at it's center.
Due to a small height the antenna is suitable for 80- and 40-meters Band.
Delta Loop UN7CI for 7, 10, 14 and 21- MHz: By Boris Popov (UN7CI), Petropavlovsk, Kazakhstan
The antenna was designed to work from a field conditions at amateur's
bands 7, 10, 14 and 21-MHz. The antenna has SWR less the 2.0:1.0 at height
of the
lower side 1.2 meters above the ground. Antenna has good efficiency.
7
Vertical UN7CI for 7, 14 and 21- MHz: By Boris Popov (UN7CI), Petropavlovsk, Kazakhstan
The antenna was designed for amateur's bands' 7, 14 and 21-MHz. Antenna
fed throw 50-Ohm coax. The antenna has SWR less the 1.5:1.0 at any band.
Antenna has good efficiency and low angle of radiation at vertical plane
(that is good for DX-ing). Only one power relay is used to switch a working
band.
35-36
Delta for 80 and 40- meters: By Valentin, RZ3DK
The Delta for 80 and 40 meters was designed for installation on the
roof of a building with help of a metal mast. Matching of the antenna
at both bands is possible with the help of the length of 75-Ohm Coaxial
in 4.82-meters.
VHF- Antenna Practice
Two Elements YAGI for 145 MHz: Balcony Project: By Aleksandr, RZ3AIX
Well, why I did a Two- Elements YAGI? Why not Three, Four or more Elements
YAGI? Or, say, so popular 2-5/8 or 3-5/8 Vertical Collinear Antenna?
Simple Weekend Antenna for 145-MHz: By Igor Lavroushov UA6HJQ
Yes, I need an antenna for 144-MHz. Not just antenna, but antenna that
can work in different conditions, from my home, from a car, from my mountain
trip. Have been tried different design I suddenly stopped to those one.
It is two elements YAGI that is very simple to design but has good characteristics.
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Fixture for Fast Assembling of VHF- Antennas: By Il'ya Yarushkin, UA9UKO
The Fixture is intended for fast assembly and disassembly of VHF antennas.
It is very useful for experimenters with the antennas or assembling of
portable VHF- antennas.
49- 50
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AN
Water Pipe T-Joint at VHF Antennas: By N. Filenko, UA9XBI
By the way, I was (and may be am) not an experienced VHF- man before
I decided to do my VHF YAGI. I had serous doubt that I spoiled lots
stuff while I made my YAGI. So I found for solution how to do the antenna
without turning in garbage my antenna's material.
P.A.
Matching a Transceiver with PA on several GU50: By N. Filenko, UA9XBI
Matching input of PA that contained several tubes GU50 with a transceiver
is not a simple matter as it seems at first look. Sometimes for simplicity
of the
design PA the driver power from a transceiver going straight away to several
connected to bridge cathodes of the GU50.
45
2xGU50 and 3xGU50 PA from UA1TAT: By Yaroslav Zhukov, UA1TAT
Two simple schematic PA made on Russian popular tubes GU50.
PA 3xGU50. Photos of the Design: By N. Kisel, UA3AIC
Photos show how to do a simple PA 3xGU50.
16
PA 2xGU50. Photos of the Design: By N. Kisel, UA3AIC
Photos show how to do a simple PA 2xGU50.
61
PA 5xGU50. Photos of the Design: By N. Kisel, UA3AIC
Photos show how to do a simple PA 5xGU50.
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Simple Broadband P.A.: By Igor Grigorov, UA3ZNW
The P.A. is very simple. It is usual push- pull with some tricks which
allows to make the P.A. in easy style.
63- 68
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Matching Circuit for Tube PA: By Sergey Lebedev, UA0UG
As usual, at a Vacuum Tube PA an output tube is matched with antenna
with help of a p-circuit. It is refer to use switching inductors or variometer.
This matching circuit can work from 3- 30-MHz without switching inductors.
The circuit is widely known among radio amateurs of 9-0 amateurs region
of Russia.
69
Free E- Books
QRP Transceivers and PAs from Accessible
Part.: By Igor Grigorov, UA3ZNW
(*pdf), 38 pages.
Book in English "QRP Transceivers and PAs from Accessible Parts "
(*pdf), 38 pages is a translation of Russian Book "QRP Transceivers
and PAs from Accessible Parts " (*pdf), 28 pages. Russian version
was published by me (on my own expenses) in 1991, in Belgorod, Russia.
I had printed 2000 samples of the book.
Of course, it was not best paper used for the book as well as not good
quality of printing. The book describes kits which my own company ("Vibrissa")
produced at the times. Naturally, the book was the manual for the kits.
Were produced 400 kits of TST (Tube- Semi- conductor- Transceiver) near
50 of them were assembled by me for customers, 200 kits SQT (Semi- conductor-
Quartz- Transceiver), near 30 were of them were assembled by me for customers,
200 kits of PA, near 60 were of them were assembled by me for customers.
Of course, the book will be interesting for all amateurs, not only for
QRP- funs
CQ- QRP- 03
U- QRP- C was alive only 9 years, from 1986 to 1995. At the times the
club had managed lots deals. At first were united QRPers from all former
USSR. It was the base for recently QRP Clubs of the former USSR- for RU-
QRP- C and for UR- QRP-C. At second, a new amateur code "72"
was accepted in the ham World due to efforts of Oleg Borodin, former president
of the U- QRP-C. At third, 3 nice QRP- magazines were printed out. One
of the magazines, CQ- QRP # 3 is pasted to AntenTop Library. The magazine
is in Russian, but the schematics are international understandable.
CQ- QRP- 02
U- QRP- C was alive only 9 years, from 1986 to 1995. At the times the
club had managed lots deals. At first were united QRPers from all former
USSR. It was the base for recently QRP Clubs of the former USSR- for RU-
QRP- C and for UR- QRP-C. At second, a new amateur code "72"
was accepted in the ham World due to efforts of Oleg Borodin, former president
of the U- QRP-C. At third, 3 nice QRP- magazines was printed out. One
of the magazines, CQ- QRP # 2 is pasted to AntenTop Library. The magazine
is in Russian, but the schematics are international understandable.
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Book "Radio Antenna Engineering"
by Edmund A Laport,
Chief Engineer, RCA International Division, Radio Corporation of America,
Fellow, Institute of Radio Engineers 1952
--- Scanned and Prepared by Dave Platt AE6EO---
About the book comment by Dave Platt AE6EO: "Radio Antenna Engineering
is certainly of significant historical interest, and may be of practical
use as well. Although some of the designs and practices portrayed in it
have been supplanted in commercial service, much of its content can still
be of significant value to amateur-radio operators and to those interested
in the practical aspects of high-power radio operation in the lower-frequency
RF bands..."
Just brief description, photos and schematic diagram.
73-75
Keys
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CW Key That Never Have Been Smallest: By Igor Lavroushov UA6HJQ
This micro key newer will be heavy for any mountain radio-expedition.
It is possible to use the key as backup or ever as main key of the amateur
radio. This key may be used at tuning antennas with hand- control tuner
(for example like MFJ- 902). For example the key may be used for tuning
ATAS- 25 with YAESU FT8x7 (FT817, FT 857, FT897). Okey, go ahead to make
it!
76- 77
Simple "PIC- KEY": By Mike Kislinsky, RX9CBI
This simple "PIC- KEY" provides sending Morse Code in two modes.
First, that was written in the memory (four memory cluster), second, with
hand jambic manipulator.
QRP Transceivers
Transceiver SQT: By Igor Grigorov, UA3ZNW
Transceiver SQT (Semiconductor Quartz Transceiver) firstly was described
at book "QRP Transceivers and PAs from Accessible Parts." The
book (in Russian) is at Antentop Free Library. The article is English
translation of the Russian one. Shortly about SQT:
DC CW Transceiver, X- tall VFO, VFO range up to 20 kHz (depenfs on used
crystal), 50-Ohms Antenna, head-phone RX with sensetivity near 1- micro-Volt,
Power Supply is 12-V, RF out is near 1-Wtts, any HF- amateur band or 2-3
amateur band (options, depends on used crystal), made on transistors.
Useful Data
Logos of ex- USSR Electronics Factories
The table shows Logos of Electronics Factories used in ex-USSR. Some
of the Logos are used up to our days
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Last update: March 1, 2018 19:58