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Routers & Modems Forum => Wireless => Topic started by: Esgrimidor on June 05, 2012, 03:27:58 AM

Title: A nasty and disgusting antenna wifi connection problem
Post by: Esgrimidor on June 05, 2012, 03:27:58 AM
Hello Shane. Nice to come back.
I have had a problem with the connection via antena and wifi usb adaptor.
One day I left to receive the signal. No webs.
But the Ralink wireless utility for my alfa 2 usb adapter tells all is going well with The signal R+ in green.

So I would like to know how must be the perfomance values of these parameters to comment.

Transmit Link Speed (Mbps)
Transmit Throughput (Kbps)
Receive Link Speed (Mbps)
Receive Throughput (Kbps)

Link Quality (%)
Signal Strenght 1 (%)

?

Best Regards
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Shane on June 05, 2012, 08:59:29 AM
Link Quality (%)
Signal Strength 1 (%)

Are the 2 most important ones to look at. What are they now?

Shane
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Esgrimidor on June 06, 2012, 03:05:39 PM
I would like a link to learn
Those values are high

I am using now the directional antenna and the problem continues with conexion limited or null and can't connect really.
I am studying the situation.

I want to learn the above concepts.
Best Regards
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Shane on June 06, 2012, 04:26:52 PM
This will explain the two a little better :-)

http://forums.anandtech.com/showthread.php?t=1013878

Quote
Link quality = Signal to Noise Ratio (SNR), or to break it down, how much noise or interference there is vs your point to point link. If your utility software will give you the strength in db's rather than a percentage it is much easier to decipher as far as strength goes. Your AP manual should give you a chart with what the signalling rate is at variant db levels. Then you factor in SNR, which if your running high SNR levels, or quality, it means you don't have much or any other 2.4 noise in your environment. It's gets a bit complex but if your quality (SNR) is good, your in pretty good shape. Different Mfg AP's will vary as to what the numbers mean in relationship to the overall performance of your link. In my experience with many many site surveys and 2.4 installations high SNR numbers are more important than the strength. Cisco AP's for instance will maintain an 11 Mb signalling rate with strength in the teens. Your actual throughput will suffer some but when your quality starts to drop, where noise is introduced, your total link quality is generally poor and you need to start looking at different placement options of the AP with dipoles or external antennas.

Shane
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Esgrimidor on June 09, 2012, 01:22:27 PM
Let's go Shane.
I will comment.
Now, sometimes, give me conectivity null or limited for an open network without password.
And always don't have connection.

Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Esgrimidor on June 09, 2012, 01:59:03 PM
Two screenshots

(http://img99.imageshack.us/img99/4479/asus09062012213056.png) (http://img99.imageshack.us/i/asus09062012213056.png/)
(http://img9.imageshack.us/img9/2223/asus09062012213137.png) (http://img9.imageshack.us/i/asus09062012213137.png/)

I have in the connection afected assign IP automatically
 :confused:
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Shane on June 10, 2012, 09:58:18 AM
The signals all look fine. You could have a cordless phone on the same channel that kills the connection or something with the router itself.

Really hard to tell at this point.

Shane
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Esgrimidor on June 11, 2012, 08:34:58 AM
What router. Mine or from receiving signal ?

(http://img854.imageshack.us/img854/9335/mozart0501201285153.png) (http://img854.imageshack.us/i/mozart0501201285153.png/)

Conexiones de red inalámbricas 3

(http://img205.imageshack.us/img205/4720/asus11062012161856.png) (http://img205.imageshack.us/i/asus11062012161856.png/)
(http://img24.imageshack.us/img24/7750/asus11062012161827.png) (http://img24.imageshack.us/i/asus11062012161827.png/)

How can I probe if mi cordless phone is causing the interference. Is in the same place some years ago. And never have any problem.

My router is about ten meters. And with wall between the pc affected.

 :thinking:
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Shane on June 11, 2012, 09:36:53 AM
All the older wireless signals are 2.4ghz.

If a phone that is also on 2.4ghz gets on the same channel it will kill the wireless signal. I have no clue how to check for that.

But if the connection works and keeps dropping at random times it sounds like something is killing the signal, like a phone or something else.

Can you change the channel that the wireless is using?

Shane
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Esgrimidor on June 11, 2012, 02:52:52 PM
Okis. I'll try my very best looking features of the Panasonic.
As we are in family I send you several photos of my home office. You see an omnidirectional antenna, but now is on the directional antenna on a tripod in the terrace, several meters away (3 meters). The problem continues.
I take photos because I don't observ any changes from the prior situation to the problem. So interferences is difficult to understand for me.

Now the photos :

(http://img521.imageshack.us/img521/3131/dscf0451l.jpg) (http://img521.imageshack.us/i/dscf0451l.jpg/)
(http://img829.imageshack.us/img829/7982/dscf0447wm.jpg) (http://img829.imageshack.us/i/dscf0447wm.jpg/)
(http://img29.imageshack.us/img29/7937/dscf0448i.jpg) (http://img29.imageshack.us/i/dscf0448i.jpg/)
(http://img444.imageshack.us/img444/5106/dscf0449b.jpg) (http://img444.imageshack.us/i/dscf0449b.jpg/)
(http://img834.imageshack.us/img834/1976/dscf0450x.jpg) (http://img834.imageshack.us/i/dscf0450x.jpg/)

I have reproduce the environment. The phone is about 2.50 mts. from the alfa 2 and the omnirectional antenna, and about 4.50 mts from the directional antenna.
And 1.70 from the CPU .

 :rolleyes:
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Shane on June 12, 2012, 10:58:17 AM
Do me a favor and try it with the house windows open. :wink:

If those are double pane house windows the gas in them kills wireless signals.

Shane
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Esgrimidor on June 14, 2012, 02:25:30 PM
 :confused: The antenna now is a directional one in the outdoors over a tripod in my terrace (terraza exterior) .
But allways have been the omnidirectional in that position without any problem.

 :shocked:

Must be something we haven't seen yet....  :undecided:
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Shane on June 14, 2012, 02:57:07 PM
That could explain it right there.

omnidirectional lets the signal go out in all directions. Being directional only means it only goes in the line that you face it, and is much easier to interfere with, you have something that is killing it, but finding out what and where is going to be dang hard.

Any chance you can just go back to omnidirectional?

Shane
Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Esgrimidor on June 14, 2012, 03:36:05 PM
That could explain it right there.

omnidirectional lets the signal go out in all directions. Being directional only means it only goes in the line that you face it, and is much easier to interfere with, you have something that is killing it, but finding out what and where is going to be dang hard.

Any chance you can just go back to omnidirectional?

Shane

Omnidirectional or Directional is the same issue.

we haven't seen the real cause.

I think we must to do some proofs far from my home. With the portatil.....

And an portable omnidirectional antenna connected to the alfa 2

I make some proofs with the portatil some days ago outside home without the alfa 2.
I think is time, is you don't give more ideas, to test the alfa 2 outside home in the portatil.

In home with the portatil is the same problem with the alfa 2. I think something is interfering, but something powerful.  And something new, because before don't affect.

In the proofs in home with alfa 2 and the portatil I get sometimes connection, but after in the desktop pc I get sometimes connection. So.

I have to repeat all the proofs with attention and taking notes.

Then, perhaps, we'll find the answer.

Title: Re: A nasty and disgusting antenna wifi connection problem
Post by: Shane on June 14, 2012, 06:29:26 PM
Thing about wireless is location means everything.

Let me know what your tests turn up :wink:

Shane