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ANTENTOP- 01-2013

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 LECTURE 15: Linear Array Theory- Part I

Linear arrays: the two-element array; the N-element array with
uniform amplitude and spacing; broad - side array; end-fire array;
phased array …

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Modifications for the Multiband UB5UG Antenna : by: Oleg Safiullin, Kazan, UA4PA: Credit Line: Radio # 9, 1969

Anyway any ham wants to have a separate antenna for each of HF-Bands. But, very often the person has only one antenna that compromised for several bands. The same is for the author of the article. He tested lots compromised antennas. However the best one was the Five Band Antenna designed by UB5UG.

The antenna may be modified with some improving in the overall antenna performance. See below the improvements...

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Antennas UA6AGW: by: Aleksandr Grachev, UA6AGW: Credit Line: CQ-QRP # 34, pp.: 23- 29

Antennas UA6AGW. Modification and Development: by: Aleksandr Grachev, UA6AGW: Credit Line: CQ-QRP # 39, pp.: 22- 27

Vertical Antenna for the 20-, 15-, 10- meter Bands
(Antenna UW4HW)

by: Yuri Matiychenko, UW4HW: Credit Line: Radio # 12, 1968, p.:21

Classical Vertical Antenna (aka Ground Plane Antenna) without additional tuning works satisfactory only at one amateur band. However, so called “thick” antennas (looks like three-dimensional geometrical figure) could work with good SWR in the frequencies range F1/F2= 3, where, F1- high working frequency, F2- lower working frequency...

Ferrite Magnetic Antenna for the 160 and 80- meter Bands: by: Vladimir Fursenko, UA6CA and Ashot Bazoyan, UA6ACA
Credit Line: www.cqham.ru

The antenna works with good SWR at the frequencies 3.500- 4.000- kHz. All antennas, what I made before (there were I.Vs., dipoles and slopers) did not work at such wide band. The antenna has input impedance 75- Ohm. It allows use a chip TV coaxial cable for the feeding of the antenna. The 75- Ohm coaxial as usual is matched well with the 50- Ohm output of the transceiver...

Input impedance for a classical Vertical Ground Plane Antenna is 30… 33- Ohm. For matching of the input impedance with a coaxial cable (50- or 75- Ohm) it needs use to a kind of matching device. Often it is not conveniently and complicates the design of the antenna. DM3SF made simple Vertical Ground Plane Antenna that has rigid design, does not require any tuning and has input impedance close to 75- Ohm. It allows use for the antenna a cheap TV-Coaxial cable. The 75- Ohm coaxial as usual may be good matched with most of ham transceivers that has output for antenna "50- Ohm."...

RA3AAE Antenna for the 10- and 2- meter Band: by: By Vladimir Polyakov, RA3AAE: Credit Line: Credit Line: Radio # 5, 1971, p.: 26

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UR0GT Antenna for the 145 and 50- MHz Band: by:Nikolay Kudryavchenko, UR0GT

51- 53

Two Broadband Antennas for the 145- MHz Band: by: Nikolay Kudryavchenko, UR0GT

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13

All- Metal Antennas are very often used at VHF. The antennas have advantages compare to some other antenna designs. All- Metal antennas are easy to make because very often such antennas are made from one length of a thick strand wire. For some design of the All- Metal Antennas it is possible to use metal traverse that is grounded to the main mast. It is conveniently for design and safety for the lighting strike. Several designs of the All- Metal Antennas for the 145- MHz Band are described below. ...

Ferrite Magnetic Antennas by RN3DEK.
Design, Experimenters and HF Antennas: by: Yuriy Skutelis, RN3DEK
Credit Line: www.cqham.ru

64- 69

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Ferrite Magnetic Antennas by RN3DEK.
LW, MW and 160- m Antennas: by: Yuriy Skutelis, RN3DEK
Credit Line: www.cqham.ru

Ferrite Magnetic Antenna for the 160, 80 and 40- meter Bands: by: Vladimir Fursenko, UA6CA and Ashot Bazoyan, UA6ACA
Credit Line: www.cqham.ru

Receiving Field HF Loop Antenna : by: Pavel Petrov, UU9JAN, Sevastopol
Credit Line: http://qrp.ru/articles

TV Ferrite Magnetic Loop Antenna: by: P. Trifonov, Credit Line: Radio # 7, 1960, pp.: 29- 30

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Two Receiving Magnetic Loop Antennas

Twin Magnetic Loop Antenna: By: Dobrynin I., Moscow

Loop Antenna for DEGEN- 1103: by: Vitali Tyurin, UA3AJO

Twin Magnetic Antenna has some advantage compare to a usual magnetic antenna.
The advantages are that the twin magnetic antenna, compare to usual magnetic antenna, has higher Selectivity and higher Effective Height...

Receiver DEGEN- 1103 (in the USA/Canada it is sold as Kaito 1103) has sensitivity at MW near 100-micro-volt/m and at LW near 1- milli- volt/m. The sensitivity may be increased at least in 20- times if the receiver would be placed inside a loop antenna...

This receiver works at all ham HF Bands- 160, 80, 40, 20, 15 and 10- meters. Bands are changed with help of plug-in coils. Receiver contains only two tubes. One tube is a pentode. This one used at an RF-amplifier. Another tube is twin triode. The tube used for the regenerative detector and audio amplifier.

Regenerative Receiver BARABASHKA-3: by: Rinat Shayhutdinov, Miass: Credit Line: CQQRP- 36, pp.: 22- 24

This simple regenerative receiver works well using a small wire antenna in length 2… 3 meters. The receiver is easy to tune up and does not contain hard- to find parts. At the design two amateurs bands are included- 40 and 20- meters. However it is possible to retune the receiver to any other bands...

Wires for Antenna and Grounding: by: va3znw

Dielectric Loaded Colinear Vertical Dipole Antenna: by: W. B. Bryson

Tunable Antenna: by: A.G. Kandoian