Pathloss 4.0 : Link Budget Calculations

After we already decided antenna heights for each link we should calculate link budget for each link to find antenna diameter, link RX & Availability as the following steps

2.5.1- Go to Worksheets from Modules menu or by pressing ctrl W. you get work sheet page as shown in Fig. 2.5.1

Fig. 2.5.1

2.5.2- Enter Point frequency & polarization at each site by pressing on Ch. Then click OK As shown in Fig. 2.5.1 & 2.5.2

Fig. 2.5.2

2.5.3- Select Radio Equipment type by clicking on TR you will get Radio Equipment page as shown in Fig. 2.5.3

Fig. 2.5.3

2.5.4- click on Code Index then New Index. Go to your pathloss folder – Equipment – MRS – NEC (where you placed NEC equipment folder) as shown in Fig. 2.5.4

Fig. 2.5.4

2.5.5- Select your radio according to Type (3000S , Pasolink , Pasolink+ , …..) , Frequency ban (7G , 8G , 11G, …….) Modulation (16 QAM , 32 QAM , 128 QAM,….) Capacity (PDH x E1 , STM-0 , STM-1) then click Both to set same Radio for both stations then Press OK as shown in Fig. 2.5.5

Fig. 2.5.5

2.5.6- Set Branching Circuit or Hybrid Loss by clicking on its Symbol (above TR) then press OK as shown in Fig. 2.5.6

Fig. 2.5.6

2.5.7- Enter Feeder Data & connection losses by pressing on Wave Guide symbol then kick OK as shown in Fig. 2.5.7

Fig. 2.5.7

2.5.8- Select antenna type for each station by clicking on antenna symbol then press as shown in Fig. 2.5.8

Fig. 2.5.8

2.5.9- Press on Code Index then New Index then brows for pathloss folder (where you placed it) – Equipment – MAS – Antenna manufacturer (Andrew, RFS, …..) – Frequency Range (102-132 , 122 – 132 , 142 – 153 , …….)then press OK as shown in Fig. 2.5.9

Fig. 2.5.9

2.5.10- Select antenna for site 1 & press on Site 1 & select antenna for site 2 & press Site 2 or in case of both sites have same antenna press on Both. The press Close – OK as shown in Fig. 2.5.10

Fig. 2.5.10

2.5.11- Set Reliability Method
In worksheet page go to Operation Menu – reliability Methods as per attached in Fig. 2.5.11

Fig. 2.5.11

Set Reliability criteria as per shown in Fig. 2.5.11-1 for SDH or as Project & Customer requirement & press OK

Fig. 2.5.11.1
2.5.12- Set of Rain factor

Press on Rain symbol – select ITU-R-P-530. 6/8 – press Load Rain File – Select Rain area according to ITU-530 Map Fig. 1.2.3 (Rain Files are placed in Pathloss folder – Rain) – Press Close as per shown in Fig. 2.5.12

Fig. 2.5.12

2.5.13- Set Geoclimatic Factor
Press on the Ground Symbol (as shown in Fig. 2.5.13-1) – Set Geoclimatic Factor according to ITU-R-P-453 as Shown in Fig. 2.5.13-2)

Fig. 2.5.13-1

Fig. 2.5.13-2

2.5.14- Make sure of either our Path Calculation is correct or we need to revise again. To do that please check the followings
- Make sure that your worksheet page has Green Correct sign in Right Bottom of screen. If it is wrong sign that's mean there are some data mistake
- Have a look to RX Signal, Fade Margin & (Annual Availability with rain) Percentage as per shown in Fig. 2.5.14

Fig. 2.5.14

• If any of (RX, Margin, Availability) is less than the required to meet the Spec. & recommendations. You have to increase antenna diameter or add Space Diversity Radio to reach to the required Spec.
• So you go to step 2.5.10 again & select new antennas

2.5.15- After finish of path calculations go to Report Menu in Worksheet page – click Full Report
You will get full path calculation report as below one. You can copy it to Word or Excel sheet & save it for reference & submitting with your survey report