Hello,

I'm having problems with clients to connect to my hotspot (I’m using 3 Groove A-2hn with sector ants), I saw that if the client was more of 20m from hotspot tower was impossible to connect. After do a spectral scan I saw that I had a lot of interference originated in the 2.5Ghz LTE band of a mobile operator that is about 10 meters of distance from my tower. I attach the spectral scan.

Tomorrow I will test to install a band filters and I will hope that solution the problem.

someone with similar problem? Some advice?

Attach the spectral scan of two of the ants (one is pointing a little to the LTE tower, is easy to see which)

Thanks

what is the frequency of your AP?

The 3 AP when I done the scan was off.

Yes, but to know if there is interference, you must tell us at which frequency they are running

The channel of the Ap1 is 2412, Ap2 is 2437 and AP3 2462

I have good news,

After install the filter on the ant with more interference, the hotspot come back to function correctly. Attach the scan with the filter of channel 2412.

Now the clients can connect more farther than before.

One big difference that I show is that when you have interference and you do a scan, only you can see a little wifi networks when you should see a lot of them (in my case I only could saw two networks, and after install the filter I see about 50 networks).

In this environment of noise if I use mimo 802.11n in 2.4ghz (20mhz) you think that the quality will be better or worse?

Some advice to improve the signal quality? perhaps this http://www.rfarmor.com/cart/index.php?m ... ducts_id=8 ? anybody tested this shields?

Thanks

where did you bought filter ?

Viewing your graph so you peak at 2490 Mhz. I have doubts as to the LTE as this operates in> 2500 Mhz and 2600 Mhz (EUROPE). In which country do you live?

Is an old filter of 8 poles that I had (I bought this in 2006 in hyperlink, now l-com) http://www.l-com.com/productfamily.aspx?id=6175

The operator have assigned the band 2575-2595Mhz. When I did the test, one ant point near the LTE (ant1.jpg) base station (tilt to the ground) ant the other in the opposite direction (ant2.jpg).

I also found this document http://www.google.es/url?sa=t&rct=j&q=c ... oQ&cad=rja that is interesting about the coexistence of LTE, WIFI and BT in mobile devices.

I found this post with similar problem, but with umts http://forum.mikrotik.com/viewtopic.php ... al#p328001 (I have more luck, I have at 5 meters UMTS and at 15 meters LTE+UMTS)

Viewing your graph so you peak at 2490 Mhz. I have doubts as to the LTE as this operates in> 2500 Mhz and 2600 Mhz (EUROPE). In which country do you live?

Hi Muso,
Because if the LTE operator works on 2575-2795 Mhz interference is occurring at 2490 Mhz? In the graph the spectrum from 2.5 GHz appears clean. It seems very strange.

This is due to the nature of cheap wireless equipment such es nearly every wireless-LAN hardware.
They simply use no band-filter before the signal reaches the antenna pre-amp.
So the high level and out-of-band will make the antenna pre-amp tune down its gain in order not to over amplify the incoming singal.
But in fact it does not over-amplify the LTE signal and completely misses the silent signal of the remote wireless party.

A band-filter will filter out the out-of-band LTE signal and makes the antenna pre-amp only see the remote party's weak signal.