Philips TW0200 User Manual

Chapter 7

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7-1.5

Meters for M/W System

1. Power Meter Anritsu - ML 4803 A

2. Power Meter HP - 437 B, 4368, Philips 3350

3. Spectrum Analyzer- Anritsu MS 7101 B,10 KHz- 23 GHz, 22 GHz- 140 GHz.

4. M/W System Analyzer (MSA) Transmitter & Receiver ME 538 M
Anritsu 4510 B Transmitter and Receiver.

5. M/W frequency counter Anritsu MF 76 A

6. Sweep Generator programmable Marconi instrument 10Mhz-20 GHz

7. VSWR Meters: -- HP Scalar network analyzer 8757 A

- HP Sweep Generator 8350 B

- Wiltron scalar network analyzer 56100 A

- Wiltron Synthesized sweep generator 68147 B

- Radart 2424 Synthesized signal generator 10 KHz – 10.4 GHz

- Adaptor S/N 9610-63090 MFR 63661

- Anritsu open/short model 22 N 50

8. Power sensors - Low power -70 to -20 dBm,

- High power -20 to + 20 dBm

9. Attenuators :- 10,20 dB HP or Anritsu

10. Jitter modulator oscillator Anritsu MH 370 A

11. Anritsu DTA Set ( Transmitter and Receiver)

12. Directional Bridge HP 85020127

13. PCM Mux Tester.

14. ANT-20

15. M/W Variable Attenuator

16. VF Oscillator

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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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