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Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an
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Table of Contents Antentop 01- 2015 (019)
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ANTENTOP- 01- 2015, # 019
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Table of Contents
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1- 4
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Antenna
Theory
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1 |
Linear Array Theory- Part III : by: Prof.
Natalia K. Nikolov 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
chose for ANTENTOP. Now I want to present to you one
more very interesting Lecture - it is LECTURE 17: Linear Array
Theory- Part III : N-element linear array
with uniform spacing and non-uniform amplitude: binomial array;
Dolph-Tschebyscheff array; directivity
and design considerations... |
5- 26 |
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HF- Antenna Practice
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2 |
Two Slopers
for All Traditional Five HF-Bands: By Vladimir Fursenko,
UA6CA It is possible at one mast
install two slopers that cover all traditional five HF-Bands- 80,- 40,- 40,- 15 and 10- meter....... |
27 |
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3 |
Antenna
for 80-, 40-, 20-, 17-, 15-, 12-, and 10- meter HF Band: By Vladimir
Fursenko, UA6CA The two- level antenna
works at 80-, 40-, 20-, 17-, 15-, 12- and 10- meter Bands. Upper
level works on 80-, 40-, 20-, 15- and 10- meter Bands. Lower level
works on 17- and 12- meter Bands. ... |
28- 29 |
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4 |
Bidirectional Vertical Antenna for
the 20- meter Band: By: Nikolay Kudryavchenko, UR0GT One Ground
Plane allows get one directional switchable DD. For this purpose
to the GP a two wires should be added. With help an RF Relay (or
just with help of manually installed jumper) the wires turn on
to Director and Reflector..... |
30- 31 |
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5 |
One L-Vertical Antenna may works
at the two amateur Bands- 40- and 20- meters. The main feature
of the antenna is that it may be located at nearest conductive
objects- for example the antenna may be placed near water drain.
Antenna may be placed at a wall of a house. Inside a house there
are always a lot of conductive objects- for example electrical
main, refrigerator, metal tubes of house ventilation system and
so on....... |
32- 34 |
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6 |
Universal
Beverage Antenna: by: Igor Grigorov,
va3znw, Richmond Hill, Canada Beverage Antennas are widely used at commercial
and military radio communication. In commercial communication
Beverage Antenna as usual is used as a receiving antenna. However,
in military communication Beverage Antenna is used for both purposes-
for receiving and transmitting applications. Transmitting/receiving
Beverage Antenna was used in DX- Pedition
EK1NWB on to Kizhy island where the
antenna (against skepticism of some persons) illuminated its good
job. So when again in Toronto I have changed my QTH and the QTH
allowed me install Beverage Antenna, I did not hesitated... |
35- 41 |
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7 |
Windom Compendium from RZ9CJ:
By: Sergey Popov, RZ9CJ, Ekaterinburg, Russia Just description of five Windom Antenas.... |
42 |
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8 |
Windom
UR0GT: by: By: Nikolay Kudryavchenko,
UR0GT Windom is one of
the oldest and reliable antennas that used in ham radio. There
are lots modifications of Windom Antenna (or in other words Off
Center Dipole Antenna). One of such modification was optimized
by UR0GT. The antenna was optimized for 40, 20 and 10- meter bands.
.. |
43 |
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9 |
Two
Vertical Antennas for 20-, 15- and 10- meter Bands: By: Nikolay
Kudryavchenko, UR0GT Below described two vertical antennas that work without any ATU at the
20-, 15 and 10- meter Bands. The antennas easy to made and easy
to tune to the bands..... |
44- 49 |
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10 |
There
are below described experimenters with UA6AGW Antenna made by
Sergey Tetuyhin, R3PIN. Sergey would
like create an UA6AGW Antenna for 2- meter Band. He did not have
schematic of the antenna for 2- meter Band. He made two antennas
that he believed would work at the 2- meter Band. However his
attempt was not successful. But Sergey during the experimenters
found some unusual sides at UA6AGW Antenna. ....... |
50- 52 |
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11 |
Because I have no lots space at my backyard for antenna installation
I like do experiments with shortened antennas. Below described
one of my experimental shortened dipole antenna
for 40- and 20- meter Bands. It takes for me only 1 and half hour
for installation and tuning of the antenna. After that the dipole
antenna was tested at CQ WW Contest (2015). I made 300 QSOs using
100- Wtts going into the antenna.... |
53- 55 |
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12 |
Modified Dipole Antenna
DL1BA for 40- and 20- meter Bands: By: Igor Vakhreev,
RW4HFN In my opinion
the explanation how the DL1BA Antenna (Antentop
01- 2015, pp: 53-55, Dipole Antenna for 40- and 20- meter Bands)
is working at the 20- meter Band is very simple. Parts of the
antenna- there are long wire (5.6-meter length) before inductor,
inductor and short wire (1.5- meter length) after inductor - make
1.5- lambda dipole at the 20- meter Band... |
56- 57 |
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13 |
DL1BA Antenna
(Antentop 01- 2015, pp: 53-55, Dipole
Antenna for 40- and 20- meter Bands) may be modified for working
at additional 10- or 15-meter Band...... |
58 |
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14 |
Modified DL1BA
Dipole Antenna for 40-, 20-, 15-, and 10- meter Bands: By: Igor
Vakhreev, RW4HFN DL1BA Antenna (Antentop 01- 2015, pp: 53-55, Dipole Antenna for 40- and
20- meter Bands) may be modified for working at additional 10-
and 15-meter Bands..... |
59 |
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15 |
Antenna for 80-, 40-, and 15-
meter Bands: By: Vladas Zhalnerauskas, UP2NV W3DZZ Antenna is widely used among radio amateurs.
The antenna shows the efficiency at several bands (as usual from
3 to 5) at minimal stuff to do it. The described below antenna
is a modification of the W3DZZ Antenna. The antenna could work
at 80- 40- and 15- meter Bands. .... |
60 |
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Antennas for 50- and 70- MHz |
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16 |
Antenna for 50
and 70- MHz Band: By: Alex Karakaptan, ES4UY, UY5ON The antenna was
designed several years ago, when I got Estonian call sign ES4UY.
With the call I able use 50 and 70- MHz bands from Estonia. Need
to say that I was in a very rare square- K049CJ. So I need an
antenna for those bands. Restricted place could not allow me to
create something serious. .... |
61-62 |
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HF ATU |
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17 |
Symmetrical
ATU: By: Vasily Perov,
DL1BA (ex UK8BA) Prototype of the tuner was made by VK5RG. The tuner was found by me at
"Das DARC Antennenbuch". However
at the book there was given only brief description of the unit.
The tuner takes my attention and by trial-and-error method I found
the design (data for Inductors and Capacitors) of the tuner. ....
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63- 64 |
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VHF ANTENNAS |
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18 |
Three Element Yagi
Antenna for 145- MHz with Square Reflector: By: Yuriy
Skutelis, RN3DEK The antenna provides good F/B ratio. Antenna has input impedance 50-
Ohm that allows fed the antenna directly through 50- Ohm coaxial
cable. It was reached by special form of the reflector. ... |
65- 66 |
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19 |
Three Element
Yagi Antenna for 145- MHz with Rectangle Reflector: By: Yuriy
Skutelis, RN3DEK he antenna has
F/B ratio at least 29 dB. It was reached by special form of the
reflector. ... ........ |
67- 68 |
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20 |
Four Element
Antenna for Stack Design for 145- MHz Band By: Nikolay Kudryavchenko,
UR0GT The
four element YAGI is designed for installing in Four Element Stack
Antenna System. The antennas not critical to nearest objects.
Four such antennas are installed at corners of a quad... |
69- 70 |
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UHF ANTENNAS |
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21 |
Vertical Antenna 5/8 Lambda
for 70- cm Band: By: Antonhax: Credit Line: Forum from: www.cqham.ru At first the antenna was modeled by copper
wire. Then the antenna was made on the base of bicycle wheel spokes.
....
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71- 72 |
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22 |
Broadband Vertical
for 430- MHz Band: By: Nikolay Kudryavchenko, UR0GT Broadband Vertical
Collinear Vertical antenna designed for 430- MHz Band. The antenna
has Diagram Directivity with low-altitude maxima to the ground.
Antenna has passband near 70- MHz at SWR 1.5:1.0. .... |
73- 74 |
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TV ANTENNAS |
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23 |
TV
Antennas for Distance Receiving By: Leonid Pozdnyakov
Credit Line: Radio # 10, 1953, pp.: 53- 54. At the original articles
published at Radio # 10, 1953, there were described several antennas
for distance receiving TV broadcasting stations. Below it is described
one of those antennas- it is a Rhombic Antenna. Rhombic Antenna
is easy to make and at the same time has perfect parameters |
75- 77 |
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RECEIVING
ANTENNAS |
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24 |
UB5UG
Horizontal Receiving Antenna: By: Yuri Medinets,
UB5UG At modern city to
use a separate receiving antenna may be only one variant to be
on the Air. Interferences from nearest electronics devices could
force it. Below here it is described receiving antenna from far
70-s that may solve the hard modern situation..... |
78- 79 |
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25 |
Insulation
RX Transformer: By: Igor Grigorov, va3znw At my shack I have
used a Coaxial Antenna Switch Protax
CSR- 5G to change devices switched to my antenna. The switch is
very convenient for amateur operation in the Air. I can easy switch
antenna from one transceiver (ICOM- 718) to another one (K1) or
turn antenna to general coverage receiver (Hallicrafters
S-85). I use the receiver to check propagation in the Air and
just to catch some interesting HF- stations.... |
80- 82 |
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TUBE RECEIVERS |
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26 |
Simple
Tube DC SSB Receiver: By R3KCR, Voronezh, Russia It is simple experimental receiver
that was made on two tubes- twin triodes. The receiver was tuned
to 80- meter amateur band. ....
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83- 84 |
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27 |
HF
Receiver for Beginner Ham: By: Viktor Lomanovich, UA3DH The HF Tube Regenerative
Receiver is a classical design of the Tube Era. Somebody gave
me magazine with the article at the 70s. I did the receiver and
got very good result. I have received lots of amateur stations
with the receiver. Then the receiver was remade by me in general
coverage HF- Receiver. I could receive with great quality forbidden
BBC, Voice of America lots broadcasting stations and easy found
at those times "Numbers Stations."
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85- 87 |
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BOOKS |
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28 |
Light description of the book
and link to download.... |
88 |
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29 |
Underground and
Ground Antennas: Georgiy A. Lavrov, Aleksey S. Knyazev Publishing House: Sovetskoe
Radio, Moscow, 1965 Light description of the book
and link to download.... |
89 |
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30 |
Light description of the book
and link to download.... |
90 |
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31 |
Light description of the book
and link to download.... |
91 |
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32 |
Construction
of a Rhombic Receiving Antenna Light description of the book
and link to download.... |
92 |
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33 |
Light description of the book
and link to download.... |
93 |
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34 |
Antennas
and Radio Propagation Light description of the book
and link to download.... |
94 |
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Page
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35 |
Design
Handbook for High Frequency Radio Communications Systems Light description of the book
and link to download.... |
95 |
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RF Transformers |
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36 |
Broadband
Transformer 50/200 Ohm: By: Sergey Popov, RZ9CJ, Ekaterinburg,
Russia Below I describe a simple way to make broadband
transformer 50/200 Ohm with isolated windings. (Theoretically
the transformer is for 50/140- Ohm. However it works fine for
most common using 50/200 Ohm.)........ |
96- 97 |
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37 |
For operation in the
Air at all HF- Bands I use to antenna Delta. The antenna is fed
by 300- Ohm Ladder Line. To match the antenna with my transceiver
I use to ATU MFJ-962D. The ATU has symmetrical transformer at
output. The transformer could provide good symmetrical operation...
but with antennas that has low reactance. My Delta has significant
reactance through amateur's bands. So the concept is not for me.... |
98 |
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Experimenters |
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38 |
Experimenters
with Microwave Oven: by Igor Grigorov,
va3znw Almost
everyone has at home a Microwave Oven. It is possible make some
experimenters with it. Most interesting and visual experiment
is Experiment with Bulbs. We may find how microwaves effect to
incandescent (filament) and CFL bulbs...... |
99- 100 |
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