Do It Yourself - 800MHz UHF Collinear Antenna

        In our office we have a lot of UHF radios, Handhelds and Mobiles, but we do not have Base radio to serve as our Control Center for our radio communication network.

        In my research I came up with an idea that Mobile Radio and Base Radio are the same, the only difference are Mobile Radio get its power at the battery of the vehicle and uses mobile antenna mounted on magnetic mounting at the rooftop of the car while Base Radio uses 12 Volts Regulated Power Supply and Having an external aerial antenna mounted on a tall structure likes tall building, tall tower and other elevated areas so that it can have a better transmission and reception of signals.

      And now I research the cost of 12 Volts Regulated Power Supply and Base Antenna, It cost as a lot and it is hard to buy because of the operating frequency that is assigned to us.

     That is why,  I am going to build a UHF 800MHz antenna for our Hytera Base radio at the office with readily available materials and others can be bought locally.

*DISCLAIMER*

SOME PHOTOS ARE NOT MINE, IT IS CREDITED TO THE OWNER OF THE PICTURES

Designed Guides

I have search Google.com and it gives me this sites for our references

In the calculation you can refer to this site:

https://jeroen.steeman.org/Antenna/collinear-coax

For additional theories you can drop by to this other sites.....

https://forum.flightradar24.com/forum/radar-forums/technical-matters-hardware/3820-best-antenna/page81#post57765

https://k7zgq.blogspot.com/2012/12/coax-cable-collinear-wireless-and-or.html

http://www.repeater-builder.com/antenna/wa6svt.html

Antenna samples from sites above for your Understanding

For the materials, I used the existing RF50 - 1/2 inch coaxial hardline cable for the element that is cut into desired length according to calculation, and copied the 1/4 wavelength balun designed with 16 Elements for high gain result, I also used the available connector for the said RF50 cable and for protection of the elements, I cover it with 3 inches PVC pipe with PVC Cap, only the connector can be seen for the transmission line.

For the tuning of the antenna

In tuning the antenna, I used a Chinese made Antenna Analyzer to get the correct operating frequency and carefully cut the element above and adjust the balun connection below for lowest SWR.

Lastly ......

These are the update pictures of my work for your additional reference....

Thanks for Visiting my Page 

Our Travel to Malaybalay City, Bukidnon

 On October 4, 2017 I and my office mate have travel to Malaybalay City, Bukidnon to mourn the departed love one of our boss, but beside of that, we also visited some historic and important  places there.

Here are some of our photos taken during our journey....

Photo outside the House of our office mates...

Seldom photo with this tree..

Photos taken at the Eco Tourism and Cultural Heritage Capitol of Northern Mindanao

Trees at our background can only be seen at colder temperature environment

A visit to their Government Center

A beautiful Scenery at the back, going home at the Claveria, Misamis Oriental.

I am glad we made a travel to that wonderful place, it is nice to travel next time around...

Enjoy watching places like this.......

Amplified Subwoofer Repair

 On May 20,2019 one of my friend ask me if I have an idea to repair his defective Amplified Subwoofer Speaker System and I answered Yes, so he bring his equipment to check for defective parts.

This is his unit....

And this are parts that I have found defective during my diagnosis...

When I have remove the Capacitor...

I found also the Power Amplifier is defective, may be due to a defective capacitor...

And after replacing those defective component parts with new one "Walahh"  Everything goes normal...

Boom boom boom........

Thanks for visiting my site............