User's Manual

Page

Next Generation

Signal Enhancement

9. System Maintenance

9.1. General

The system normally operates without any operator intervention or

maintenance. In the event of fault, the field replaceable units (antenna &

cables) should be checked for faults and the system restored if possible. A

faulty unit can be removed and replaced with a spare while the rest of the

system is still operating. Soldering or local repair of the modules should be

avoided. Faulty module/unit should be replaced with genuine spares from

Shyam Telecom Limited only.

However, the power supply of the faulty unit should be isolated from AC

mains and DC power before any module is replaced. In the event of a

system malfunctioning, the status of the antenna systems should be

checked as well as the continuity of the cabling before replacing any

modules within the repeater.

9.2. Preventative Maintenance

The DB6MR20 repeater does not require any preventative maintenance.

9.3. In-Building Coverage Problems

If the coverage area appears to be smaller than the installation site plan,

there are only a few possibilities that limit the signal level in the area.

I) Physical obstructions degrading the signal level-Visually inspect the

area of weak coverage. If possible, rearrange objects that may be

interfering with the signal path. Pay particular attention to large metallic

objects that reflect or block the signals to the weak coverage area. If

weak coverage area still persists, check the following:

a. Inspect the indoor RF coaxial cable and its connection with

connector

b. Indoor antenna direction and its tilting

c. DB6MR20 repeater gain setting

II) Defective Indoor coaxial cable/Antenna – Check the RF coaxial cable

and antenna. If necessary, replace each individually with a known

functional unit, and verify the respective signal level. This can be

achieved by observing the signal strength indicator on a mobile handset

that has an unobstructed line-of-sight view, 15 to 20 feet (5 to 7 meters)

from the indoor antenna. If the signal level increases at this test location,

re-verify the signal level in the weak coverage area. If the signal level

remains marginal, inspect the unit.