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Table of Contents Antentop 01- 2015 (019)

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Table of Contents Antentop 01- 2015 (019)

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# Table of Contents

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### Antenna Theory

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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……

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### HF- Antenna Practice

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It is possible at one mast install two slopers that cover all traditional five HF-Bands- 80,- 40,- 40,- 15 and 10- meter.......

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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. ...

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4

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.....

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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.......

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# Table of Contents

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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...

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Just description of five Windom Antenas....

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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. ..

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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.....

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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. .......

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# Table of Contents

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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....

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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....…

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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......

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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.....

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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. ....

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# Table of Contents

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### Antennas for 50- and 70- MHz

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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. ....

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HF  ATU

17

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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VHF ANTENNAS

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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. ...

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he antenna has F/B ratio at least 29 dB. It was reached by special form of the reflector. ... ........

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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….

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# Table of Contents

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UHF ANTENNAS

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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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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. ....

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TV ANTENNAS

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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...

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RECEIVING ANTENNAS

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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.....

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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....

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Table of Contents

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TUBE RECEIVERS

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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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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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BOOKS

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Light description of the book and link to download....

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Publishing House: Sovetskoe Radio, Moscow, 1965

Light description of the book and link to download....

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Light description of the book and link to download....

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Light description of the book and link to download....

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Light description of the book and link to download....

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Light description of the book and link to download....

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Light description of the book and link to download....

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## Page

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Light description of the book and link to download....

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RF Transformers

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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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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....

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Experimenters

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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......

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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 Updated:

February 4, 2018 18:14

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