Need wireless link setup p2p help

RouterOS Wireless Networking
1

Hi, I have to setup 35 kms p2p link.
I am using 800mw cards, with 30dbi parabolic antenna, 1 meter pigtail, RB 411ah, 35 meters cat5.

One end location in google earth is 247ft and another end is 111 ft. After that both have 100ft tower.

There is one higher location at 268ft in between.
Location A: 247 ft + 100ft, Location B: 111ft + 100ft tower.

Will the cards and everything should suffice? And At what height both end my antenna on tower should be fitted ideally?

Currently I am getting -94/-95 signal strength. Will this work with 1mb throughput?

I am using both end Bridge mode with 2.4 and no interferences in between.
When both links come and setup wds with each other, 1 radio gets restarted automatically. Although this problem is solved if I set card rates TX Power to 17. Should I use defaiult card rates or use as specified in cards?

2

What is the distance from point A to the “higher location”?

3

Point A to Point B is 32 kms in google earth

4

Why not use link planner like the free - http://www.ligowave.com/linkcalc/

..1 meter pigtail…

Is this low loss LMR cable?

5

its good qulality but I am not sure as nothing written on those cables mostly LM 600.
How much difference would it make?

6

There is one higher location at 268ft in between.

What in on that “hill” any trees or buildings? if so you may have a Fresnel zone problem.

7

May be, but I have 100ft tower on 247 ft
247 + 100ft

And another lower location
Attaching the ligowave pdf. Plz check the same and advise, I am new to the filed so need help.

Currently I am getting Tx/Rx Strength of -90/-91. I have grid antenna fitted horizotally.
LigowaveLinkAnalysis.pdf (83 KB)

8

You have used vertical polarization and -70 on rx, try horizontal and -90

9

oops!! Attached new one.

I didnt get what here means Link Availability?
I need 1mbps throughput with good reliability? What changed do I need ? or will it work fine?
LigowaveLinkAnalysis-NewHori.pdf (69.1 KB)

10

You have a fresnel zone issue which will effect your throughput, you will need to select another site which has line of sight to both point A and point B.

11

Line of sight seems clear. but fresnel not. But can you help how that effects I read but couldnt understand.

THe fresnel zone has some hindrance as in pdf, so that will create an issue?

What should be ideal location, what fresnel will be cleared and no obstacles?

12

http://www.terabeam.com/support/calculations/fresnel-zone.php

For any PTP to have good throughput you cannot have fresnel zone issues, as suggested pick another site to link A to B and maybe this site could also be used as PTMP as well as PTP?

13

Thanks a lot!!.. I cant take another site as this is customer requirement and no other site available.

Any other good tools and suggestions for p2p links? And will this fresnel zone come for p2mp also?
What should be ideal requirements

  1. 25 km p2p link. What antenna type and gain? what tx power cards? And what sort of radios? - considering good LOS and fresnel
  2. 3 km p2mp, what antenna type and gain? and what should be same for customer CPE?

Thanks again for help.

14

Another option if you want to cover the distance over that terrain is go higher on a mast both sides and use 5.8ghz as it will have less than half the fresnel zone area of 2.4ghz,

As regards p2p’s I would suggest use of 5.8ghz, 25km p2p link antenna between 26 to 30dbi gain and the antenna to cover 4.9 -6ghz as this is important should you need to change frequency at a later date due to interference, etc
Radio’s - MIKROTIK Metal 5SHPn also a right angled N connector adapter,

Is the 3km p2mp using 2.4ghz?

Ps - Extra Krama is always welcome for helping.

15

It could be 5.8 or 2.4 whatever experts suggests :slight_smile: