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Frequent Contributor II

hwat is the best way to allign 2000 Meter Mesh link between 2x MST200?

Hi Dears,

 

hwat is the best way to allign 2000 Meter Mesh link between 2x MST200 and what will be the expected data rates and throughut on distance like this as per Datasheets MST200 can support 7.5 KiloMeter so waiting you asistance

Re: hwat is the best way to allign 2000 Meter Mesh link between 2x MST200?

Do you have line of sight and clear visibility? If so, then there are a couple of ways, one is free and one requires some expensive hardware.

 

For the free method, you need a compas, declinometer (consturction equipment, at Lowes or Home Depot), and Google Earth is a plus (or a handheld GPS unit). Capture GPS and elevation, etc. From there you can calculate with google earth or your GPS coordinate headings (X degrees + or - from due north). If one site is above or below the other you also need to account for uptilt or downtilt on each end. Once close you can have a partner on the other end make small changes in heading and log in to the MST200s to monitor SNR/RSSI, make a small change, monitor for a minute to see if it improves or not, etc. Will take trial and error. 

 

For the expensive method, you can buy/build special laser alignment tools, there's lots of examples on the internet.

 

Throughput at 2km should be approx 40Mbps HT20, or 60-70Mbps HT40, depending on how you deploy (L2 or L3). 

Jerrod Howard
Sr. Techical Marketing Engineer
Moderator

Re: hwat is the best way to allign 2000 Meter Mesh link between 2x MST200?

Here is a short video from our Director of Outdoor Solutions Engineering showing some of the methods he uses for antenna allignment:

 

https://www.youtube.com/watch?v=1WmKfxMPxus

Frequent Contributor II

Re: hwat is the best way to allign 2000 Meter Mesh link between 2x MST200?

Thank you so much I just also noticed something on 20MHZ link quality was 17% when I changed it to 40MHZ I wasn't able to get any link why is that?

Re: hwat is the best way to allign 2000 Meter Mesh link between 2x MST200?

You link isn't strong enough to support HT20 more than likely, at the threshold configured. HT40 requires better signal/SNR. If your link is 2km and you only have 17% of signal, you need to either align them better or identify what is blocking the signal.

 

How high are they off the ground (for fresnel clearance), what is between the two antennas (line of sight obstructins, trees, fences, power lines, etc)?

Jerrod Howard
Sr. Techical Marketing Engineer
Frequent Contributor II

Re: hwat is the best way to allign 2000 Meter Mesh link between 2x MST200?

there was trees in freznl zone but we will go higher but I found something strange on outdoor planner it said :

 

 The data rate associated with one or both RSSI values is too slow to establish a connection
 Go to Global Vars to double-check noise floor or move the antennas closer together
• The RSL of one or both ends is too low to establish a connection
 Go to Define Nodes to boost the signal

Re: hwat is the best way to allign 2000 Meter Mesh link between 2x MST200?

You will need to provide the KMZ with the placemarks set, your intended design, antennas with headings/azimuth, etc. You would get that notice if the distance was too far, or alignment was not correct.

Jerrod Howard
Sr. Techical Marketing Engineer
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