Line of sight microwave link (Line of Sight, LOS) propagation surveying

The necessary equipment
required to have two teams and personnel with voice communication equipment.

• SAF Spectrum Compact (SC) - a spectrum analyzer apparatus
• SAF SG Compact- signal generator device
• Two antennas
• 2xSMA cable
• 2x compass
• 2x level tool
• Two waveguide adapters (optional)

Preparation
using specialized design and radio link budget planning tool path calculation to determine significant values, for example: azimuth, elevation, frequency, polarization, and the target reception signal level. SG-Compact using the output power in the calculation, in particular, antenna gain and frequency parameters.
Before climbing tower, make sure the direction towards the other locations. Use a compass to find the right azimuth, and look for something in the environment as a reference point. When you're in the tower, it will help you align the antenna.
Please note! Metal structures such as telecommunication towers and the like may affect the accuracy of the compass. The Executive azimuth measurements on the ground from the tower reasonable distance.

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Installation and Configuration

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1. Climbing tower.
2. The antenna is mounted at a selected height and polarization position.
3. The adjustment in the horizontal direction of the antenna azimuth is selected as the reference point and the objects in the environment.
4. It is strongly recommended to use tool level vertical angle of the antenna is adjusted to 90 degrees with the ground.

Please note! The steps of the two sites 1-4.

1. FIG angle to the ground antenna

• By the SG-Compact SMA cable connected to an antenna in which a site (two sites to ensure mounted on the same polarization)
• The center frequency and the SG-Compact power unit to the same calculation.
  
  FIG 2. SG-Compact frequency and power menu
• The antenna is connected to another site by SMA cables Spectrum Compact.
• The center frequency of the SG disposed on the center frequency Spectrum Compact, and SPAN to the minimum.

Please note! SC and the SG frequency settings must match.

How to set the frequency on the SC: Frequency -> Center MHz -> (your frequency) -> Input

FIG 3. SC into the frequency menu

FIG 4. SC into the center frequency

• If correctly initial coarse, the signal track should appear on the display screen SC, similar to Figure 4.

Please note! If the calculated target received signal level below -80dBm, the function of the LEVEL scaling on the SC signal to achieve better visualization.

LEVEL on how to set up SC: Tools -> LEVEL-> Set MIN and MAX

FIG 5. SC into the Tools menu

of FIG. 6. SC into the menu LEVEL

• Use AVERAGE mode to reduce noise. LoS survey recommended settings: an average of 2 or 4 average.

How to set the average mode on SC: TRACE MODE-> 2/4 Average

FIG 7. SC enters tracking mode in

FIG. 8 enters a tracking mode Average

• To measure the input power of the desired bandwidth (BW), press POWER IN BAND button, and entering a value using the numeric keypad, provided the necessary bandwidth to 4MHz.
  
  9. FIG POWER IN BAND into the
  
  view of the inner band 10. Power menu

Fine tuning

• Starting from the SC site. Adjust the horizontal alignment to find the maximum received signal level. Once found, a fixed current position.
• SG horizontally aligned on the site and antenna fixed at the maximum height.
• After completed horizontal fine alignment, vertical alignment in the same manner as the antenna.

Please note! Please note that due to the side-lobe antenna error caused by alignment. In addition to projecting a main lobe, also has a small radiation pattern sidelobes.

For example: if the received signal is less than or equal to the calculated RSL 20dB, you may have already found the side lobes. Continue to slowly sweep the flap to see if you can find the main lobe.

• If the maximum received signal level obtained from the calculated value of +/- 3dB, it indicates that no significant loss in the signal path, and therefore can be considered a clear line of sight