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ANTENTOP- 01-2010

 

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Antenna Theory

 

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1

Aperture Antennas - Part I : 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 Aperture Antennas- Part II

Rectangular horn antennas. Circular horns.

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HF- Antenna Practice

 

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Directional Helical Antennas: by I. Kapustin, UA0RW

Practical Design of a small sized two Directinoal Helical Antennas for the 20- meters Band.

PDF file, 210 KB (ANTENTOP-01-2010, pp: 34- 37)


 

34- 37
 

 

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Narrow DEWD Dipole for the 80- meters: By: Nikolay Kudryavchenko, UR0GT

Practical Design of a small sized two Directinoal Helical Antennas for the 20- meters Band.


38- 39
 

 

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4

Dipole Antenna for the 80- meters With Rectangular UR0GT- Match : By: Nikolay Kudryavchenko, UR0GT

It is an alternative way (compare to DEWD) to design a broadband antenna- use so called "UR0GT- Match." The match was offered by UR0GT at 2004 at HZ- Forum. The match was used to feed VHF- Antennas, but it works at HF too.

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Dipole Antenna for the 80- meters With Triangular UR0GT- Match: By: Nikolay Kudryavchenko, UR0GT

It is an alternative way (compare to DEWD) to design a broadband antenna- use so called "UR0GT- Match." The match was offered by UR0GT at 2004 at HZ- Forum. The match was used to feed VHF- Antennas, but it works at HF too.

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DEWD Dipole for the 80- meters with a Stub Matching: By: Nikolay Kudryavchenko, UR0GT

It is just a variant of a DEWD Dipole for the 80- meters with Stub Matching.
The antenna has enough good parameters - Pass Band and Efficiency.

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Narrow DEWD Dipole for the 80- meters with a Stub Matching: By: Nikolay Kudryavchenko, UR0GT

It is just a variant of a Narrow DEWD Dipole for the 80- meters with Stub Matching.
The antenna has enough good parameters - Pass Band and Efficiency.

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Narrow DEWD Dipole for the 80- meters with an Inductance Matching: By: Nikolay Kudryavchenko, UR0GT

It is just a variant of a Narrow DEWD Dipole for the 80- meters with an Inductance Matching.
The antenna has enough good parameters - Pass Band and Efficiency.

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Super Narrow DEWD Dipole for the 80- meters with A Stub Matching: By: Nikolay Kudryavchenko, UR0GT

It is just a variant of a Narrow DEWD Dipole for the 80- meters with an Inductance Matching.
The antenna has enough good parameters - Pass Band and Efficiency.

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10

Simple Field One- Wire- Length HF Antennas : By: Igor Lavrushov , UA6HJQ

Below will be described simple one- length- wire HF antennas. The antennas were designed for mountain's radio- expeditions. The main criteria were- low weight plus simplicity. All described below HF- Antennas were tested in Northern Caucasus Mountains with a transceiver FT- 817 and ATU MFJ- 902 and provided good result.

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Flat EH- Antenna for 10- MHz: By: Vladimir Kononov, UA1ACO, St.-Petersburg

Some days I heard 10- MHz. Good propagation conditions, lots stations but no antenna. Only 42- meters length of wire was connected to my ICOM-7000 through ICOM AT-180. So, I decided to make EH-Antenna for the band. To avoid too much job with cylinders (that are commonly used at EH- Antenna) I made a Flat EH- Antenna from stuff from my scrap- box. It takes only 3- 4 hours for making and tuning of the antenna.

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Flat EH- Antenna for 10- MHz in the Winter: By: Vladimir Kononov, UA1ACO, St.-Petersburg

In three weeks the winter came in my town. I made more the 100 QSOs with 25 countries using power 30- Wtts. Antenna was covered by snow but it is worked. I did lots QSOs with the snow- EH-Antenna. As rule I could make QSO with any station that I heard.

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Regenerative Receivers

 
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Some Thoughts on Regenerative Receivers : By: Paul W. Ross, W3FIS

After having monitored, and occasionally participating, in the discussions on the Yahoo Regenerative Receiver Newsgroup, I thought it might be of interest to throw in both some of my experiences, and professional thoughts. I suffer from being an E.E. by training, having grown up at the tail end of the vacuum tube era, as well as having held an amateur radio license for half a century.

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Simple Short Wave Receiver : By: V. Egorov, UA3AB

Note from va3znw: It was the first tube regenerative receiver that I have made by myself. At the far times I was a thirteen years old boy that fall into radio and certainly into amateur radio. I already made a transistors' then tubes' HF converter for my old tube receiver "Muromets." So, I could hear amateur stations.

However, one friend of mine, old ham (he was at the times in his forties) told me about my converters:- "Good job! But.. what I would like to say… all the stuff (converter and receiver) you may change for one tube receiver. It would get the same reception."

Another day he gave me an old soviet magazine "Radio" with the schematic. When the receiver was made and tuned, I discovered that the one- tube receiver really worked almost similar to converter with "Muromets."

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Simple QRP Transceivers

 
15

A Multi Band Tube 10 w QSK Transceiver: Igor Grigorov, UZ3ZK

In the SPRAT # 67 (SPRAT is the journal of the G- QRP- Club) was published a circuit of a tube DC receiver. I made this G0ILL receiver and enjoyed of it perfect reception. Later I modified the receiver to transceiver.

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A 10- meter Band CW Transceiver : Vladimir Polyakov, RA3AAE

It is a variant of a simple DC transceiver. Transistor of PA works like a mixer in receiving mode. So, there is no any commutation in the RF circuits. The transceiver has output power 0.35- Wtts, shift TX/RX- 400-Hz, RX sensitivity 2 microV. Power voltage is 15-V, current at RX/TX - 30/120-mA.

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An 80 m CW Valve Transceiver : By: Igor Grigorov, RK3ZK

It is possible to build this transceiver in one evening using surplus parts. It has a sensitivity of near 5- microV and output power on 3.5- 3.6- MHz near 1-Wtts.

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PA

 

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Practical Photos for P.A. on Tube GU-43B: By: Nikolay Kisel, UA3AIC, Moscow

Just photos and steps how to do a simple PA on a power tube GU-43B

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Linear Power Amplifier on G811: By: S. Bunin, L. Yailenko

The PA is designed for ham bands 160- 10- meters. It provides 200 Wtts CW/ 500 Wtts PEP SSB. Efficiency of the PA is 65- 70% in depend on used r\band.

 

 

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Patents

 
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Ground and/or feedline independent resonant feed device for coupling antennas and the likes.

Just a description of the patent

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Last update: March 29, 2016 9:16