B11 low SNR on Access point


#1

Hi,

We have diferent links running very good, but we have 2 links with poor results, one of them is this:

But on the reality is:

The acces point has bad SNR and signal.

Can halp me?

Thanks.


#2

Could you post your “Channel & Power” page? Are there trees or other structures along the way of your path? It seems like you are in a very hilly area, are you shooting over water or big fields?


#3

It’s possible that you are on a sidelobe. I am not sure if it’s a fresnel obstruction because all of your SNRs and signal levels are pretty close.


#4

Hi!

Not Tree, not structures and qhen is raining not afect so much de link…it’s really strange.


#5

Could you show us the spectrum graph for both sides of the link as well? Also are you really using 0 dB antennas? I am always nervous on our B11s to make sure all the settings are correct because we are licensed and there were a few WISPs in Colorado that got nailed with some huge fines a few years back for using incorrect power settings on their antennas.


#6

Hi!

No, we use 34dB antenas, I think this is an error of the web interface.

We are configured the antenas like a link simulator on mimosa web.

Spectrum graph:


#7

Who’s your antenna manufacturer? Are you using the latest firmware? I just setup a 2x80 link with 36 dB antennas and I did not see any graphical bugs for antenna gain. That said, dialing in one of these links at 10 km can be pretty hard. (Took me most of a year to find a bad link in our network that had never been dialed in correctly. Once we did though, boy oh boy did it move data…)


#8

We had a link link this. You are on a side lobe on at least one dish. Go peak them up and you will see.


#9

Hi!

We Are using Jirous Antenas. Latest Firmware. Abaut the antena gain theis week we will try to reconfigure or reboot and will see.

@Brock we will try to peak up one side and will see, we will post de result.

Thanks to all!


#10

Parabolic antennas are hard, make sure to swing through your X and Y axis fully to locate the true alignment and not just a side lobe. It is really easy to start aligning on a lobe and never get a good signal, you will know you are on your main lobe when a small adjustment of the antenna causes significant changes to the signal strength (.5-2 dB)


#11

Hi @Marc4,

The following video is all about B11. If you click this link, it’ll start you on the actual alignment part of the video: https://www.youtube.com/watch?v=DNmJZ5tOJ_w&t=94s


#12

Hi!

Thanks a lot! We re-align de link and we adjust on the main lobe and the result is very good!
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We love Mimosa :slight_smile: