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AirNav RadarBox and RadarBox24.com => AirNav RadarBox and RadarBox24.com Discussion => Topic started by: elTrauko on May 15, 2019, 06:49:18 PM

Title: Antenna array, it is possible?
Post by: elTrauko on May 15, 2019, 06:49:18 PM

Hello,
I need help with my antenna, it is installed halfway up a tower and it makes "shadows" as you can see in the image 1, the solution that I think would be an array with two antennas (image 2), the question is: is it possible ?, how should I connect the cables to maintain 50 ohm and gain.

Title: Re: Antenna array, it is possible?
Post by: Runway 31 on May 15, 2019, 08:23:40 PM

How far away is the existing antenna from the tower, can it be moved out away from the tower.  Would an extension cable for the antenna help|?

Alan

Title: Re: Antenna array, it is possible?
Post by: elTrauko on May 15, 2019, 09:22:46 PM

The antenna is 4 feet from the tower and 50 feet high, the idea is not to add cable to avoid a greater loss of signal, my intention is to use some type of splitter or duplexer that allows me to combine two antennas.
My Max range is 374 MN.

César

Title: Re: Antenna array, it is possible?
Post by: Aerotower on May 16, 2019, 07:30:06 PM

Can you show a picture of the installation?

Thanks

Title: Re: Antenna array, it is possible?
Post by: elTrauko on May 16, 2019, 09:45:11 PM

For now I can not upload photos,  I'll be out for some time and I'll be back in mid-June.
For now:

https://www.radarbox24.com/stations/EXTRPI009186

On the first occasion I will take some photos to upload.

Saludos desde Chiloé
César

Title: Re: Antenna array, it is possible?
Post by: elTrauko on May 16, 2019, 11:29:41 PM

I found what could be the solution in a post of neroon79 http://www.airnavsystems.com/forum/index.php?topic=7298.msg246421#msg246421
Apparently the solution would be to install a splitter ZAPD-20-N+

Title: Re: Antenna array, it is possible?
Post by: Stealth on May 18, 2019, 06:42:29 AM

You can fabricate your own splitter by using two equal lengths of 75 ohm co-ax which will then match reasonably closely to your 50 ohm feeder. The connection could just be made by hard-wiring in a die-cast box or with three suitable co-ax connectors. Velocity factor doesn't matter, just use the same physical length to each antenna.