Quality Yagi
Quality Yagi
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What kind of range (in miles) can I expect with a 12dBi 2.4GHz yagi and a 1 watt amp?
The antenna and amplifer are both good quality; so is my LMR-300 coaxial cable (about 30 feet of it). I've listed some specs below:
Yagi: (from Netgate.com)
Max. Gain: 13 dBi (+/- 0.5 dB)
Min. Gain over band: 12 dBi +/- 0.5 dB)
Frequency: 2.4 - 2.5 GHz
VSWR: < 1.5:1 between 2400-2450 MHz
< 2.0:1 between 2450-2500 MHz
Feed power handling: 10 W
Azimuth Beamwidth: 44° (+/- 2°)
Elevation Beamwidth: 48° (+/- 2°)
Input impedance: 50 ohms (nominal)
Input connector: integrated 20cm RG58 pigtail with N Female connector
Polarization: Linear vertical and horizontal
Dimensions (L x W x H): 95mm x 400mm x 40mm
Amplifier: (from Hyperlinktech.com)
Frequency: 2400 - 2500MHz
Max Input Power: 100mW (20dBm)
Transmit Power: 1 watt (30dBm)
Receive Gain: 17dB nom.
I'm also quite aware of the legalities for private use, however I am a licensed professional doing range testing for rural ISP clients... that's my story and I'm sticking to it.
I hate to say this but if you are in the US you are over the LEGAL FCC LIMIT (even lower in UK and most of Europe) with this setup. 36db max based on what you say 30db (1watt amp) + 12db(antenna) = 42db - line loss which is not much at 30 feet of cable === ILLEGAL power.
Once you modify a Part 15 device, such as by using a non-approved antenna you modify its RF characteristics which change important details such as how much Effective Radiated Power (ERP) which is limited to 4W in the US
30db=1watt 33=2watts 36=4watts. Each 3db is double the ERP.
However. your range is limited by "LINE of Site" so if you can "see" the other end you can reach it. As long as no obsticles are in the way this is good for MILES and MILES.. we have used much less power and 19 db for up to 20 miles. See this article for a 125mile link -- no amps.
http://www.unwiredadventures.com/unwire/2005/12/defcon_wifi_sho.html
Have fun and stay out of jail drop the power some! Power isn't going to get through obstacles! DO NOT GET IN FRONT OF THIS THING it is MICROWAVE and at that level will indeed begin to cook you. (Many Microwave ovens are on 2.4 gig just for information).
Just noticed your a "Licensed Professional" why ask the question -- your supposed to KNOW THIS STUFF!
I am just an Extra Class HAM (who can run power on 2.4) and WISP owner and I know it..
If you really want range you wont use a YAGI -- not enough directionality! Oh and don't forget the OTHER end of your connection needs to be able to reach you too!
Tips to Improve Your Wireless Connectivity
Over the years the wireless technology has made easy to get rid of cables and has taken the task of computing away from desk. As the technology is advancing it is becoming a household norm and there are some easy things that you can do to improve your wireless connectivity. Let us learn how to do this with the help of computer repair expert.
The first thing that you should do is to position your router. Always remember that a wireless router does not carry far so there should not be any walls that might act as interference. For this reason a wireless router should be centrally located in your home to get the best possible range. All you need to do is to place the router on a flat surface off the floor and away from obstructions. Additionally you will find that there could be interference from the wireless signal. Just make sure that you are using unique wireless channels to limit any sort of interference.
The next thing is to replace your antenna. Most of the antennas that are shipped with routers are small and have omni-directional capabilities. These antennas broadcast signal in every direction and proves to be quite useful if you want wireless connection throughout your house but the range is quite short. A directional antenna can improve its range by focusing the signal in one direction. These types of antennas are known as "high gain" and the increase in signal is measured in decibels (dB).
The other thing that you can do is to get a repeater. A wireless repeater is an easy and safe way to boost the strength of your signal. The function repeater is almost like a router but instead of creating a signal, it relays an existing signal. A repeater is much easy to install but does not require additional wires and cables. You can create a complete connectivity in a home or business network with the help of multiple repeaters. The next thing is to get an antenna booster because it is possible to make antenna and homemade reflector to improve the wireless signal. You can seek information about this online which will help to use materials like foil and cardboard. The common designs are parabolic satellite shape and a "coffee can" yagi antenna. Both can help you to increase range and direct signal though the quality varies in the homemade one.
The last thing that you can try is to upgrade firmware. Router manufacturers often publish firmware updates therefore upgrading your router can provide a performance boost and helps you to access new features. If you are tech-savvy then you can try to install third-party firmware. There are a number of free and safe alternatives that are compatible with your router. You can easily find the ones that have robust infrastructure than official firmware packages.
With the help of these tips you will be able to improve the performance of your wireless connectivity.
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Curt Yagi - All I Want is You (U2 cover)
