LLigetfa
join:2006-05-15
Fort Frances, ON
| reply to Rahail
Re: How to Build a low cost cpe with build in amp
There is always two sides to the equation. An AMP only covers one side well. Good antenna gain always trumps more power becuase it covers both sides. Of course you have to reach the AP so if receive dB is good, the power needs to be adequate to return to the AP. One cannot assume that the return signal will do as well.
As to what antenna to choose, YMMV. I believe the general consensus is that a high gain panel will outperform the same gain in a dish when LOS is not to be had. |
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Rahail
join:2005-12-21
Troy, MI |  LLigetfa thanks for input i will make sure to cheack both end |
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SipSizzurp
Fo' Shizzle
Premium
join:2005-12-28
Hilo, HI
 ·RoadRunner Cable
| I just did some testing to the HP model. I was almost shocked at the improvement in performance over the regular model. It weighs several ounces more, and the on-board power amp has some real ZAP. At my test distance, the regular model set to 125 Mw was fluctuating 1 or 2 bars of signal on the laptop, and connect rates were 11 and 5.5 random. With the HP in the same place and set for 30 Mw, (DD-WRT on both radios) my laptop shows a solid 2 and bumps 3 bars with 18 and 24 mb connect rates. I've had it with netstumbler. It is crap. The primary scan screen only shows the Db level that it catches when it initializes, and does not update properly. If the signal gets stronger, it indicates the increase, but never follows it back down as the signal decreases. The green graph that plays midi music was pathetic and equally useless. Does anyone know of a decent alternative to netstumbler ? It is a broadcom internal radio. I saw another model of laptop with a broadcom site monitor utility that was superb, but cannot seem to locate it to try on my machine. Pointers would be welcome. It would be nice to hook these radios to a service monitor to see what they are actually doing. I am estimating the HP model's output at around 300Mw. Rahail, if you have access to any half-way point between you and the client, you might consider putting a relay station there.
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Mi ultima pinche Carta Blanca. Que triste ! |
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Rahail
join:2005-12-21
Troy, MI
1 edit | Some one told me if you enable the amp and put the radio on 10mW it can hit up to 100Mw so if you put 100 mW it can hit up to 1000mw now sure how much true... however I did test today with hp unit 3000 feet way from my AP nlos lots of trees and housed on the way i got about -72 thing was my crazy friend he was on the roof so his moving to much I couldn't get the stable signal ... However one of forum member helping me with bi-quad antenna so I am gone make home mad bi-quad and try test on Wednesday and I will pass my result wish me luck ..... I can feel the good thing 
Btw keep posting your result |
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SipSizzurp
Fo' Shizzle
Premium
join:2005-12-28
Hilo, HI
·RoadRunner Cable
| The output seemed to saturate with about 55 Mw drive. Going higher did not make the signal stronger, but it made the laptop start dis-connecting. Even at 45 Mw the signal was very strong, and the radio was getting hot pretty fast. 30 Mw is the most I think you should set it for.
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Mi ultima pinche Carta Blanca. Que triste ! |
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Rahail
join:2005-12-21
Troy, MI | how far was your distance is there any way you can try .... nlos test and post your result |
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SipSizzurp
Fo' Shizzle
Premium
join:2005-12-28
Hilo, HI
·RoadRunner Cable
| I just got them today and I will test them some more and let you know. The problem that you have with 3000 feet of trees and houses will not get much better, even if you put a big amplifier on each end. 2.4 GHZ will be blocked easily by the obstructions and I do not think you will have much luck with more power or better antennas. They will help a little, but still will not be reliable in the end. Think of the wi-fi signal like a flashlight. If the light from a little flashlight cannot go through the side of a house, a great big spotlight will not get through either. The wall will stop all of the light. Your obstructions are going to stop almost all of your signal, even if it is very strong to start with. You need to find a place in the middle for a relay that can get service to each end. By the way, light and 2.4 GHZ radio waves are the same stuff, just a big difference in frequency.
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Mi ultima pinche Carta Blanca. Que triste ! |
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