Philips TW0200, Manual

Page: 9 / 44

7-1.6
Before proceeding
any M/W system A/T ---------
1] Get TT-O, TT-1 duly filled in all respect,
2] Collect Survey report which includes,
- Check list
- Route details
- Site survey report
- Particulars at a glance
- Clearance calculation
- Path data calculation
- Rain attenuation calculation
- Availability calculation
- Interference calculation
- Tower diagram
- Line diagram
- Path profile
- Site map
Here you have to check the deviation in survey and nominal level which should not be
more than ±3 dBm.
N.B. Nominal system level and sample survey report 14 pages attached h/w and just for
reference Optel, HFCL,PCL system’s front views are shown in Fig. nos. 7-2, 7-3, 7-5.
3] Check whether Tower is new or existing, carry out Earth measurement in both the
cases. Limit of Ring Earth is 0.5 ohms.
4] Before starting local A/T carry out a physical inspection of installation, Tower, W/G
Earthing and its entrance in equipment room.
5] Confirm that all required meters, RF cords, available or not? This is important
because so many types of meters and cords are required in M/W A/T.
6] Check whether W/G entry is through hatch plate or not?
7] Obtain equipment room layout of all stations along with repeaters, duly approved
by DET Maintenance.
8] Take the information regarding antenna diameter, gain etc. also confirm whether
orientation of antenna is over or not, receive level is within limit or not.
9] Whether -50V is taken from MCB with proper gauge wire or not.
10] Check QA stamp or QA approval of the system
11] Obtain SACFA clearance, if not available or if applied then note down the
registration number along with the date.
12] Note down earth resistance measured by maintenance within 6 months or
otherwise carry out earth audit.
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