User Guide

PAMS

Technical Documentation

NSE–8/9

Troubleshooting

Page 44

Issue 1 07/99

6. Synthesizers

There are three oscillators generating the needed frequencies for

RF–section. 13 MHz reference oscillator, 464 MHz VHF VCO and UHF

VCO.

The frequency range for UHF VCO is GSM TX: 2012.4 ... 2061.6 MHz,

PCN TX: 1942.2 ... 2016.8 MHz,

GSM RX: 2012.4 ... 2061.6 MHz,

PCN RX: 1992.2 ... 2066.8 MHz.

6.1 . General instructions for Synthesizer troubleshooting

Start WinTesla–Service–Software and

Select: P

roduct Alt+p

and b

SM g

Select: Te

sting Alt+e

F Controls r

X Continuous Alt+r

nt. Mode Ch: 60 Alt+o, 60

6.2 .. 13 MHz reference oscillator

The 13 MHz oscillator (G701) is controlled by COBBA_GJP (N200). This

13 MHz signal is pulse–shaped and connected to SUMMA (N700) and it is

also buffered, filtered and connected to MAD2 (D300).

6.3. VHF VCO

The 464 MHz VHF VCO (G702) signal is used to generate the 116 MHz–

and 232 MHz signals inside SUMMA. The 116 MHz signal is used in GSM

transmitter and in PCN receiver. The 232 MHz signal is used in PCN

transmitter.