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EA3AKP Spain flag Spain

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Ham Member Lookups: 89793

 

 

HAM RADIO, ANTENNAS AND FRIENDS

 

 

My fascination for the radio started when I was 10 years old and very soon I became a radio enthusiast and a very Young radio operator, first on CB band, later on, in HF bands.

Very soon my main interest was focused on antennas systems, experimenting and trying to get the best performance of the aerials that I had built up at my parents QTH.

I discovered the cubical quad antennas reading old radio books and having very interesting QSO’s with Russian and American Hams.

After some years of testing and experimenting certainly with success with the Quads, I met on the radio K3BB, Mr. John Koszeghy(sadly now silent key) an excellent radio and antenna engineer and even better friend who helped me on the design of my current cubical antennas.

I basically use on my installation monoband quads on 10,15,6 with dual driven elements and I also work on the WARC bands with the four element five band cubical quad.

As you can see in my antenna description, I like Quad antennas for the low bands, I dare not to built up such big antennas I use yaguis instead. About yaguis I rely on Tom from www.optibeam.de, He designs his own yagui antennas with very high accuracy to get the best performances and He is also able to apply very engenious mechanical solutions, even for the big low band yaguis, He (in my opinion) achieves perfectly the two main goals, excellent antennas electrically, mechanically and very reliable ones. I own an OB-804020, 3 monoband yaguis interlaced perfectly on the same boom, acting as monobanders in each of the bands. The configuration is five elements widely spaced on 20 meters, 3 elements on 40 meters and 2 elements on 80. It is a very good antenna with tremendous performance in the three bands, this beauty is installed on a crank up tower from Luso Tower Japan. You can find Luso Tower cooperation visiting http://www.lusotower.eu/ And you’ll see the best crank up towers ever built.

Iwant to thank to Tom and Dianafrom www.optibeam.de for their help on my antenna installation, to Miss Xuan Ma and Miss Chimoda from Luso Tower and also to all my friends who helped me along these last years: Agustí – EA3GSN specially, Xavi – EA3CC, Miquel – EA3BEM, Jordi – EA3PC, Joan Anton – EA3FDY,Terry-K8NY (excellent quad designer and builder) and Josep Martínez – EA3HQZ (the engineer).

You can hear me on the bands trying to get some DX and experimenting with the antennas and propagation.

My other hobby is exercise, basically I like to stay fit and do my daily workouts along with some running and swimming. I’m very interested also in all related with exercise physiology, nutrition and natural supplements for sports men because It’s part of my job.

Thank you for visiting my page and I’m looking forward to hear you on the bands.

73 + DX

Joan EA3AKP

 

April 2015 NEW ANTENNA INSTALATION - OPTIBEAM OB8040X

New five element interlaced duo monoband yagui 80-40 meters. Two monoband yaguis for 40 and 80 meters interlaced on a 15 meters boom. On 40 meters It's a 3 element full size yagui and for 80 meters are 2 elements shortened by high Q coils. This antenna shows a forward gain of 5,57 Db and front to back of 35,17 Db on 40 meters, also the bandwith has increased very much in comparison to my old 40 meter shortened elements.

The 80 meter elements remain the same with an element lenght of 22.8 meters and a forward gain of 3,73 Db and front to back of 15,65 Db. The OB 8040X is installed on the LUSO crank up tower at about 40 meters above the ground.

Thank you very much to Tom and Diana from OPTIBEAM and to my friend Agustí EA3GSN for their help in this antenna installation.

 

Tom, owner of OPTIBEAM Antennas, below the OB8040X and OB21-3.

View of the OB 8040X

OB8040X on top of the LUSO tower.

Tom, from OPTIBEAM, checking the antenna.

 

 

 

 

 

 

 

 

 

 

EA3AKP climbing up the LUSO tower ladder.

 

Agustí-EA3GSN assembling the OB21/3.

 

OB21/3 already installed on the tower about 18 meters above the ground.

This is a high performance tribander 10-15-20 meters antenna even compared to my high gain cubical quads, the OB21/3 interlace perfectly 5 elements for 20 meters, 5 elements wide spaced for 15 meters and 11 elements for 10 meters acting as a 6 elements wide spaced yagui with a single feed line.

The gain is 8 DBD on 20 meters, 8,4 DBD on 15 meters and 9,3 DBD on 10 meters.

The boom lenght is 14,10 meters and the turning radius is 8,20 meters.

 

 

 

Typical gamma match for the 10 meters 4 element cubical quad.

 

New cubical quad stack for 10 meters, 4 over 4 monoband cubical quads at 15 meters and 5 meters above the ground.

 

Inside view of the XR1000 LUSO Tower Rotator.

 

 

 

 

1886170 Last modified: 2015-04-19 07:56:24, 9854 bytes

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