Radio Preppers

General Category => Antennas => Topic started by: Jon_Garfio on June 03, 2017, 08:32:32 AM

Title: Delta loop home made for 50 mhz
Post by: Jon_Garfio on June 03, 2017, 08:32:32 AM
I want to share with everyone this antenna that I made past week, tired of no good signals in 6 m band.

The antenna cost  3-4 euros, no more, and I expend about 1 hour to built it.

The antenna in my habitual place.

(http://i226.photobucket.com/albums/dd195/jonherran/IMG_4390_zpshjkhhhp4.jpg) (http://s226.photobucket.com/user/jonherran/media/IMG_4390_zpshjkhhhp4.jpg.html)

This is the original idea that I copy to make it.
(http://i226.photobucket.com/albums/dd195/jonherran/IMG_4377_zpskduyzi9e.gif) (http://s226.photobucket.com/user/jonherran/media/IMG_4377_zpskduyzi9e.gif.html)

The item is basically a 6.10cms triangle of wire (I use a 1.5mm but with 1mm is enought).
To tunning the antenna we can use a unun or use a bit of 75 ohms coax (tv coax cable standard), exactly a 99cms for 50 mhz.

This type of antennas have two problems, doesn´t work if have metal parts near and if We mount it at least 1/2 wave leght between the ground, in this case 6m band, minimun 3m between antenna and ground.

First of all, I mounted it into my flat and It was horrible, no rx and a ot of SWR...

I use the antenna without tunner, SWR is 1:1 in all the band, perfect, simple and good performance. All that I can heard, I can worked.

(http://i226.photobucket.com/albums/dd195/jonherran/IMG_4453_zpsmu4cgush.jpg) (http://s226.photobucket.com/user/jonherran/media/IMG_4453_zpsmu4cgush.jpg.html)
(http://i226.photobucket.com/albums/dd195/jonherran/IMG_4452_zpsu0pt1nev.jpg) (http://s226.photobucket.com/user/jonherran/media/IMG_4452_zpsu0pt1nev.jpg.html)

This is the results of my log in two hours.

(http://i226.photobucket.com/albums/dd195/jonherran/FullSizeRender_zpsph4li5bq.jpg) (http://s226.photobucket.com/user/jonherran/media/FullSizeRender_zpsph4li5bq.jpg.html)

The delta loop can works vertical or horizontal, if you fit the apex up and corner feed is a vertical polarization.
Here you are the scheme about polarization:
(http://i226.photobucket.com/albums/dd195/jonherran/loopolr_zpsolyzsmdr.jpg) (http://s226.photobucket.com/user/jonherran/media/loopolr_zpsolyzsmdr.jpg.html)

Title: Re: Delta loop home made for 50 mhz
Post by: Jon_Garfio on June 03, 2017, 10:05:04 AM
First improvement for the ropes.

(https://uploads.tapatalk-cdn.com/20170603/0c0ce54d41fc8406d01d4b54cb7813e7.jpg)


Enviado desde mi iPhone utilizando Tapatalk Pro
Title: Re: Delta loop home made for 50 mhz
Post by: gil on June 03, 2017, 10:31:05 AM
Very nice Jon. Thank you!
Gil.
Title: Re: Delta loop home made for 50 mhz
Post by: htfiremedic on June 03, 2017, 11:30:06 AM
Nice, thanks for the work


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