User Guide

PAMS
Technical Documentation
NSE–8/9
Troubleshooting
Page 45
Issue 1 07/99
Fault finding table for VHF VCO
The fault finding is as described for UHF VCO with following exceptions:
UHF VCO VHF VCO
1 SUMMA N700 pin 21 changed to SUMMA N700 pin 12 Vdc = 1.8 ... 3.0 Volt
2 UHF VCO G700 changed to VHF VCO G702
3 SUMMA UHF PLL changed to SUMMA VHF PLL
4 UHF VCO G700 OUT–pin changed to VHF VCO G702 OUT–pin Pout > –3 dBm
The exceptions will be inside (.) in the fault finding chart for the UHF VCO.
6.4. UHF VCO
UHF VCO (G700) is used to generate the first injection for RX (GSM
2012.4 ... 2061.6 MHz, PCN 1992.2 ... 2066.8 MHz) and the final injection
for TX (GSM 2012.4 ... 2061.6 MHz, PCN 1942.2 ... 2016.8 MHz). The
output frequency of the module depends on the DC–control voltage
coming from SUMMA.