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작성자편의점알바 조회 29회 작성일 2021-12-06 13:08:31 댓글 0

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Antennas: Omni vs Yagi

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Check out our full line of Industrial Hardware on our website: https://www.rspsupply.com/

When trying to communicate over long distances, using communication cable can be expensive and impractical. In these cases, it is common to use industrial communication radios. These radios require the use of an antenna to transmit and receive data to and from other locations. The two most common types of antennas used in these applications are either Yagi antennas, or Omni antennas. Today we will talk about the differences between the two, and why we might use one antenna vs the other.

Yagi Antennas (aka Directional/Uni-directional)
- Directional antennas that can transmit and receive data coming from a specific direction (the direction the antenna is facing). Thus, directional antennas must be aimed in the direction of the potential signal transmitter(s)
- Aiming the antenna correctly is essential for optimal reception.
- Knowing the width of the antenna's signal pattern is the best way to ensure optimal aim. One way is to judge this is by its dBi rating. The higher the dBi rating the narrower the reception cone. And the more concentrated the signal.

Advantages and Disadvantages
• Ability to communicate from longer distances
• Can get better signal strength
• Requires more adjustments to get good communications between antennas
• Uni Directional means limited communication for each antenna

Typical use case… remote locations

Omni Antennas (aka Omni-directional)

- Omni-directional antennas can pick-up signals coming from all directions. They are most commonly used for signal reception over a large area where the potential location of any incoming signal's transmitter varies. Therefore, unlike Yagi antennas, Omni antennas do not need to be pointed to a particular direction since their antenna pattern is 360°.
- Each specific antenna has a gain rating or dBi (decibel isotropic) number which coincides with the performance of the antenna.
- Note that: the higher the dBi rating = larger area covered

Advantages and Disadvantages

• Easy setup and install
• Can send and receive signals from multiple locations with just one antenna
• Limited on the distance it can communicate
• Not a great option from areas with poor signal strength

• Typical use case… Master Stations that receiver multiple signals from all different locations.

Conclusion
• The location you need to install your radio can help you determine what type of antenna will work best for that application.
• Yagi Antennas = more adjustments, strong signal strength from greater distances.
• Omni antennas = little if any adjustments, easy to set up limited range, but can talk in all directions.
Thomas Tammaro : Amazing instructional video. You took a complex subject and broke it down simply. THAT'S teaching!!
Andyj986 : The Omni directional antenna’s dbi rating works the same as the yagi antenna. The higher the dbi rating in a Omni antenna the more horizontal range you’ll get in all directions. The lower the dbi rating in a Omni directional antenna the more vertical range you’ll get in all directions the lower the dbi the more spherical the range is around the antenna. Your drawings are correct but the Omni illustration only shows a “birds eye view” of the radio waves. The “side on” view of the Omni antenna is the same as the yagi. The yagi antenna works the same way as the Omni, the only difference is that it needs to be pointed at the tower/repeater for it to work.
Dionysis Ch : Hi ! Nice video!! I want to ask you... if I only care about the receiving signals (don’t care about transmitting) would I have to prefer a high dbi antenna or a medium?? Is higher dbi antenna more sensitive to receive??? Thank you in advance
Samtroy : let's say there is a yagi antenna of range 2 miles and an Omni antenna of range 0.5 miles. now Omni antenna is placed at 1.5 miles from the yagi antenna (in the direction of yagi). we know that Omni is in the range of yagi, but yagi is not in the range of Omni. we know Omni can receive signals from yagi.
will yagi can receive signals from Omni?
durlav dhadumia : Loved the Video!! I am new to radio technology. And didn't know about Yagi and Omni Antennas. This video absolutely cleared my concepts. Thanks a lot!

Yagi vs Omni Antennas What's The Difference? | WilsonPro

https://goo.gl/YTV99X Learn more about WilsonPro Professional Cellular Amplifiers here.

Yagi (or directional) and Omni (or omni-directional) antennas are both used on the outside of a building as the donor antenna to capture the cellular signal there and send it to the amplifier. But what's the difference?

In this short video we'll quickly discuss the differences between these types of antennas. We'll also cover best cases for when to use each type of antenna.

We recommend carrying one of each type of antenna on hand when you do an installation. This way you can tweak the system and test out each type of antenna and see which one provides the best results.

We go into more detail on these types of antennas in this video:
. Watch this video if you'd like to learn more.

If you have any questions feel free to contact our Customer Support at: 1-888-503-5329 or visit us online at the link above.
Mike Parker : The directional antenna in your video is an LPDA, not a Yagi. Yagis operate on a single, narrow frequency; LPDAs operate on multiple frequencies. An LPDA looks like a Yagi, but they are not the same thing.
Matej Munih : Hi, what should I choose for a home in the mountains with low/medium signal and no visible LTE tower?
TheDarkseid : Using Cell Mapper and LTE Discovery it appears I have 3 towers within 1-2 miles of my home in a rural area. Trees would be the only thing truly blocking anything. All 3 towers that appear in the app are in the same direction. There is a 4th in the opposite direction, but i do not seem to connect to that tower at any point. Which is best a Yagi or Omni antenna?
Steven Seagull : Hi, i've been wanting to get myself an antenna for my 4g router huawai B311-221 that was providaded by my internet provider but idk if i should get an omni or a directional antenna, according to cellmapper i only have 1 4g antenna near my house, but with opensignal it says that i have 3 antennas about 2 to 3km away (1.2 to 1.9 miles), on my router the db are RSRQ-15.0dB RSRP-107dBm RSSI-71dBm SINR-8dB more or less it flactuates, and my speed tests also depends i usually get arround 1.2 to 3mb/s but it can go as low as 250kb/s.

Can anyone please help me out in deciding which type of antenna to get? Thanks.
Samtroy : let's say there is a yagi antenna of range 2 miles and an Omni antenna of range 0.5 miles. now Omni antenna is placed at 1.5 miles from the yagi antenna (in the direction of yagi). we know that Omni is in the range of yagi, but yagi is not in the range of Omni. we know Omni can receive signals from yagi.
will yagi can receive signals from Omni?

Is it OK to place my Helium omni antenna against a metal pole or wall?

In this short video I illustrate a few issues with poor antenna placement. If you mount an omni antenna, be it helium miner, 4G, 5G, WiFi or any application too close to a metal surface or pole it will cause trouble.
You may either find a nice directional antenna in the setup, or worst case you will find a massive problem in the forward direction.
In this video we show how it's best to just stay clear of antenna obstructions, both from a radiation pattern perspective as from an input impedance / VSWR point of view.

For product specific information please visit https://rfshop.com.au/product-category/antennas/helium-mining/
Helium Downunder : Top content Dave.....This is a subject I was wanting to cover for so long..... Excellent....
pawspaws101 : Enjoyed that David, really explains something I saw recently out in field with those exact same omni ants where noticed reduced forward gain (where had been good last field trip) when I placed survey tripod with mounted ants parallel to vehicle (because cable length)
Joanna Ramoutar : Amazing video! Thank you for this! This may be the dumbest question ever (and it's definitely not something I would do myself) but theoretically could you use that "wall" to your advantage to have the signal bounce somewhere else.. For example, you have a slanted antenna, and you create a wall to purposely bounce the signal that would be facing towards the sky to now be pointing to a different direction? Just a theory I'm wondering would work or not. Awesome content btw!
beachsidetech : I have worked in RF for a long time and this is a fantastic explanation! Great job!
e1chard : Great video, and happy to have inspired it . Following your instructions I moved my antenna 1 meter far from the rear wall. Sadly I can't put it on the house roof. What would be the minimum distance from real wall to minimize the interferences and optimize the signal transmission? I have a 5.8 dbi fiberglass antenna. Thank you

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