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Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an
Special page devoted to
Table of Contents for AntenTop 01, 2018, # 022
ANTENTOP- 01- 2018, # 022
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Table of Contents
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Table of Contents
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Page
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1- 4
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Antenna
Theory
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1 |
Antenna Installations: Fact
and Fiction: Jack Beever, Jerrold Electronics
Corp Considering that antennas are daily familiars in the life of the average
TV technician, it is quite surprising that they are also among
the least understood items with which he deals. Some common misconceptions
and half truths concerning them have come to the author's attention
in the experience he has had with antenna installations..... |
5- 7 |
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HF- Antenna Practice
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2 |
Low
Profile Antenna for the 30, 20, 17, 15, 10 and 6- meter Bands:
In the summer 2017, when the winter with winds and ice storm was
far away, I decided to install a Low Profile wind and ice rain
resistant antenna. Why I decided do this? There were some important
reasons. My Beverage Antenna was remade. Now the antenna wire
was not going along wooden fence but hang upped in the space.
Efficiency of the antenna is grown up but reliability went down.
Canadian winter with strong winds and ice rain may very make my
Beverage antenna down. So I need weather proof antenna in case
if the Beverage antenna cannot stand the winter.... |
8- 11 |
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3 |
Delta Antenna for
80- 10 meter Band: Serge Smirnov, RK3BJ, ex: EW7SF, UC2SF The simplest antenna
that could provide operation on all HF bands is a Delta Antenna.
The antenna made in the shape of Delta needs minimum points for
installation, does not required grounding like a vertical does
and the antenna is not critical to nearest objects. The antenna
does not required high mast for installation. If the antenna made
as one band one it may feed direct through a coaxial cable. However
for multiband operation the antenna is required a matching device
at its feed-points... |
12- 13 |
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4 |
UA6AGW
Antenna with Vertical Radiators for the 20- meter Band: The antenna,
made on the base of UA6AGW Antenna, was designed and build
in 2017, at first at all for fixed and field operation. Author
is very appreciated to Andrey, IP50AA, for his very useful advices
on the antenna design... |
14- 16 |
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5 |
Construction of simple antenna and matching network that provides a good
compromise in height, cost, and coverage... |
17- 21 |
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6 |
UA6AGW
Balcony Antenna for the 20 meter Band. (Version 20.23.63) : The antenna, working Version 20.23.63, has sizes
1 x 2 meters and designed for installing at a limited space. The
antenna made like an experimental one and showed good result at
the Air test... |
22- 23 |
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7 |
Small
Directional Antenna for 21- MHz Band: The antenna is experimental variant
of small directional antenna. Antenna is easy to do and for tuning,
require a small room for installation, therefore provide good
directivity... |
24 |
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8 |
OK3TDC DX antenna for 80- meter band was widely known in the former USSR... |
25 |
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9 |
The antenna is a variant of well- known T2FD antenna.
This modified antenna have been working at my ham station for
decade years and showed itself as low noise antenna that works
from 1.8- MHz to 30- MHz, does not required ATU, easy to repeat,
allows to receive weak DX- stations (especially on low HF- Bands),
does not receive static interferences and has lots other advantages... |
26 |
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10 |
W3DZZ
Antenna for the 160, 80, 40 and 10 meter Band: W3DZZ antenna
may be used at 160, 80, 40 and 10 meter Band. For the times of
low solar activity those ones are that live bands... |
27 |
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11 |
Simple
Vertical Monoband Antenna for HF Band:
The simple
antenna was tested in field condition on 80 and 40- meter Band.
The antenna is shown good result in the Air...
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28- 29 |
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12 |
W3DZZ Antenna:
Modification by UR0GT : The W3DZZ Antenna was optimised by UR0GT. Now the antenna for 80, 40,
20, 15 and 10 meter Band has resonance frequencies inside those
bands with good SWR. The antenna was optimised for feeding by
75- coaxial cable. It is possible buy such cable for reasonable
price. Transceiver with 50 - Ohm output as well would be work
with such antenna... |
30- 31 |
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13 |
4-
Element YAGI Antenna for the 20- meter Band: The simple 4-
Element YAGI Antenna for the 20- meter Band has very stable parameters.
Antenna has SWR less the 1.1:1 at 14.0- 14.35- MHz.
Antenna has input impedance 50 Ohm. The antenna may be made of
aluminum tube in diameter of 30- mm. Antenna has high gain, and
very easy for tuning... |
32- 33 |
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Antennas for 50- MHz Band |
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14 |
Tin
Woodman Antenna for the 50- MHz Band: There is presented
Tin Woodman Antenna for the 50- MHz Band. The antenna is very
simple in design. The antenna is electrically closed so this one
is safe in a lighting period. Antenna has good SWR at the band.
Antenna has 50- Ohm input impedance that allows feed the antenna
directly by 50- Ohm coaxial cable. Antenna allows to be made with
some tolerance. Antenna installed on a mast in 6 meter high...
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34- 35 |
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15 |
2
Element Tin Woodman Antenna for the 50- MHz Band: There is presented 2 elements
directional antenna for the 50- MHz Band. The antenna is very
simple in design. All elements of the antenna are electrically
closed and connected to metal traverse so the antenna is safe
in lighting period. Antenna has good SWR at good F/B ratio at
the band. Antenna has 50- Ohm input impedance that allows feed
the antenna directly by 50- Ohm coaxial cable. Antenna allows
to be made with some tolerance. Antenna installed on a mast in
5 meter high... |
36- 37 |
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16 |
3
Element Antenna for the 50- MHz Band:
There is presented
3 elements directional antenna for the 50- MHz Band. Antenna has
good SWR at the band and excellent F/B ratio. Antenna allows to
be made with some tolerance. It is very convenient for because
in real life it is very hard to note all outer environment objects.
Antenna has 50- Ohm input impedance that allows feed the antenna
directly by 50- Ohm coaxial cable... |
38- 39 |
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17 |
5
Element Antenna for the 50- MHz Band: There
is presented 5 elements directional antenna for the 50- MHz Band.
Antenna has good SWR at the band and excellent F/B ratio. Antenna
has 50- Ohm input impedance that allows feed the antenna directly
by 50- Ohm coaxial cable... |
40- 41 |
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18 |
6 Element Antenna for the 50- MHz Band:
There is presented 6 elements directional antenna for the 50- MHz Band.
Antenna has good SWR at the band and excellent F/B ratio. Antenna
allows to be made with some tolerance. It is very convenient for
because in real life it is very hard to note all outer environment
objects. Antenna has 50- Ohm input impedance that allows feed
the antenna directly by 50- Ohm coaxial cable... |
42- 43 |
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19 |
I just want a little privacy- sad Shrek (or something similar to that
thing to avoid me a copyright problem). So I am. I decided to
install plastic net for clementine flowers at my desk on the backyard.
The clementine flowers are perfect do masking me when preparing
BBQ, reading a book or just do experiments with antennas and home-
brew radios. However it seems to me no sense to install just a
net for clementine flowers without putting an antenna to this
one. The net with flowers should perfect masking an antenna on
it. The sizes of the net allow install there just antenna for
10 or 6 meter Band. I have chosen an antenna for 6 meters... |
44- 48 |
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VHF Antennas |
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20 |
RN3DEK 4- Element Antenna for the
145- MHz Band : There is presented 4- element
antenna for the 145- MHz Band. Antenna has good SWR at the band.
Antenna has input impedance 28- Ohm. For matching of the antenna
with 50- Ohm coaxial cable there is used known matching device
on two parallel length of 75- Ohm coaxial cable. To compensate
reactive component a capacitor is switched on with the vibrator... |
49- 50 |
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21 |
RN3DEK 4- Element Antenna for the 145- MHz Band with Gamma Match:There is presented
4- element antenna for the 145- MHz Band. Antenna has good SWR
at the band. Antenna does not require follow to strictly dimension
of the elements. So the antenna may be done ever by a ham who
has no large experience in the antenna building... |
51- 52 |
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22 |
RN3DEK
3- Element Arrow Directional Antenna for the 145- MHz Band: There is presented 3- Element Arrow Directional
antenna for the 145- MHz Band. The antenna is matched with coaxial
cable with help of gamma- matching. Antenna has good SWR at the
band and excellent F/B ratio. Antenna does not require follow
to strictly dimension of the elements. So the antenna may be done
ever by a ham who has no large experience in the antenna building... |
53- 54 |
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23 |
UR0GT Directional DEWD
Antenna for the 145- MHz Band: There is presented
directional antenna for the 145- MHz Band with active vibrator
made on the base of UR0GT DEWD Antenna. Antenna has good SWR at
the band and excellent F/B ratio. Antenna does not require follow
to strictly dimension of the elements. So the antenna may be done
ever by a ham who has no large experience
in the antenna building... |
55- 56 |
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24 |
UR0GT Chireix-
Mesny Directional Antenna for the 145- MHz Band: Chireix-
Mesny Directional Antenna may be used
for operation on 145 MHz. designs of
the antenna is presented here. The antenna has wide passband,
high gain, not critical to installation and nearest environment.
Chireix- Mesny antenna has input impedance 200 Ohm so it is possible
match the antenna with 50- Ohm coaxial cable with help of 4:1
transformer... |
57- 58 |
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25 |
Twin
Delta Direction Antenna for the 145- MHz Band: Twin Delta Antenna
is a good variant of a directional antenna for the 145- MHz Band.
The antenna is simple to make and has good parameters. Antenna
has high gain and does not require any tuning when made according
to the drawing... |
59- 60 |
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26 |
3- Element
Broadband Antenna for the 145- MHz Band: The simple 3- Element
Broadband Antenna for the 145- MHz Band has very stable parameters.
Antenna has wide passband that makes the antenna not critical
to implementation and to near environment. Antenna has SWR less
the 1.5:1 in 11- MHz passband and SWR less the 2:1 in 21- MHz
passband... |
61- 62 |
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UHF Antennas |
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27 |
UR0GT Dual Band Antenna for the 145 and
435- MHz Band: The simple dual band antenna
for 145 and 435- MHz band is easy to do and almost does not required
tuning. Only tuning is to change angle of the counterpoises to
make exact match with 50- Ohm coaxial cable. Antenna maybe installed
on the top of a mast, on balcony rail or at any suitable place... |
63- 65 |
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28 |
10 Element Antenna
for the 432- MHz Band: The 10 element antenna
has good SWR from 428 to 436- MHz. Antenna
is matched with 50- Ohm coaxial cable with help of a loop. The
loop is made from insulated wire in diameter of 2- mm. Loop may
be moved along vibrator to find optimal matching. Then by shortening
of the right length of the coaxial cable (it is a capacitor) do
final matching |
66- 67 |
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29 |
10 Element Antenna
for the 436- MHz Band: The 10 element antenna
has good SWR from 430 to 440 MHz. Antenna
is matched with 50- Ohm coaxial cable with help of a loop. The
loop is made from insulated wire in diameter of 2- mm. Loop may
be moved along vibrator to find optimal matching. Then by shortening
of the right length of the coaxial cable (it is a capacitor) do
final matching |
68- 69 |
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30 |
10 Element Antenna
for the 433- MHz Band: The 10 element antenna has
good SWR from 430 to 434 MHz. Antenna
has input impedance 28- Ohm. For matching of the antenna with
50- Ohm coaxial cable there is used known matching device on two
parallel length of 75- Ohm coaxial cable... |
70- 71 |
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31 |
Simple Antenna
for the 435- MHz Band: The question that usually stands
before beginner amateur that makes first steps on the 435- MHz
band is what antenna should be chosen. Antenna that easy to design
has high gain and does not require any tuning |
72- 73 |
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Low Pass Filters for
145 - MHz Band |
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32 |
Two Simple Low Pass Filters
for 145 - MHz Band: Anatoli, RL1L ex. (RA0C, EY9AF, RA6XPL, RA6PS, RA6PGY)
A Low Pass Filter is recommended to use in a Field Day operation
when several amateur radios that work at 145 and 430- MHz are
placed close to each other. In this case the third harmonic of
the 145- MHz radio (when it transmits) may cause interferences
for 430- MHz radio |
74- 79 |
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Antenna Switching
Units |
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33 |
Oh, it was very good
times long ago. I had one antenna on the roof and one home-made
transceiver in the shack. My antenna was connected to transmitter
without even using an RF-connector. Coaxial cable from the antenna
just was soldered to transmitter's PA. These are the times that
every radio amateur remembers as being the best in one's radio
amateur life. But in due course,
new antennas were installed, to first home made transceiver was
added a commercial made second one then an old military third...
Antenna connectors on these transceivers were differed from each
other. That situation caused to use RF adapters and special coaxial
cables to alter the arrangement of rigs and antennas. There came a time
when I entangled in antennas, receivers, transceivers, and the
methods of switching to alternate antennas and change from one
rig to another. Solution was clear- it should be used clear marked
an Antenna Switching Unit (ASU)... |
80- 86 |
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Experimenters |
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34 |
FSM (Field Strength Meter) is
the device that should be present on any amateur radio station.
As for me, I have been using MFJ- 801 FSM for a long time. I use
this device on all HF bands as well successfully tried it on the
145 and 430- MHz band. I used to the MFJ- 801 in the field under
rain and snow and, of course, at home without problem from this
one. However I've decided add to my radio station a simple RF
Sniffer that may sniff the radio waves up to 3000 MHz i.e. that
device should react on to cell phones and internet routers....
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87- 90 |
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Wideband Transformer |
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35 |
Wide
Band 1:4 RF Transformer for Matching 200 Ohm Antenna to 50 Ohm
Coaxial Cable : Yeh, it
is too long title for the article however it is the right one.
Below it is described two variants of wide band 1:4 RF transformer
for matching 200 Ohm antenna to 50 Ohm coaxial cable. One transformer
for unbalanced another one for balanced antenna. Transformer works
well at all HF- Band from 160 to 10 meter. Transformer is very
simple to do. Design of the transformer is clear understandable
from the schematic and pictures... |
91- 92 |
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36 |
Design
of Wide Band RF Transformer on Ferrite Tubes : Ferrite transformer on ferrite tubes performs several
functions at once: this one does match of the feeding coaxial
cable to the antenna (or transform impedance of the antenna to
impedance of the coaxial cable), balances RF current at feeding
terminals of a symmetrical antenna and suppresses the common-mode
current on to outer side of the coaxial cable braid... |
93- 94 |
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BOOKs |
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37 |
Fundamentals
of Microwave Communications This is old and reliable book
on the subject of the Fundamentals of Microwave Communications.
The book was published in 1994. The book is a sub-course of the
Signal Officer Basic Course. It contains information data, questions
and answers on the subject, so it is possible to check gained
knowledge of the themes. The book is very easy to read and gives
useful information and basic knowledge on the Fundamentals of
Microwave Communications... |
95 |
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38 |
There is Antenna Handbook from far 1936. The book contains only 82 pages
but the pages soak lots information relative to antennas. Radio
wave propagation, antenna theory and practice, ATU and antenna
feeding- all of this question were lighting on the pages... |
96 |
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39 |
Principles
of Radio Wave Propagation This is old and reliable book on the subject of the
Radio Wave Propagation. The book was published in 1994. The book
is a sub-course of the Signal Officer Basic Course. It contains
information data, questions and answers on the subject, so it
is possible to check gained knowledge of the themes. The book
is very easy to read and gives useful information and basic knowledge
on the Radio Propagation....... |
97 |
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40 |
This is old and reliable book on the subject of the Microwave Techniques.
The book was published in 1994. The book is a sub-course of the
Signal Officer Basic Course. It contains information data, questions
and answers on the subject, so it is possible to check gained
knowledge of the themes. The book is very easy to read and gives
useful information and basic knowledge on the Microwave Techniques....
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98 |
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41 |
I try paste
in the AntenTop site books that would
be useful and interesting at all times. One of such book is Radiotron
Designer's Handbook. The book was prepared by Pete Millett and
taken from his site http://pmillett.com/...... |
99 |
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42 |
Lunokhod 1 was the first of two unmanned lunar roverslanded on the Moon by the Soviet Union as part of
its Lunokhod program. The Luna 17 spacecraft
carried Lunokhod 1 to the Moon in 1970.
Lunokhod 1 was the first remote-controlled robot "rover"
to freely move across the surface of an astronomical object beyond
the Earth...... |
100 |
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January 13, 2019 14:42
