User Guide

Technical Documentation
NHB–3
PAMS
Troubleshooting
Original 26/97
Page 31
Synthesizer Signal levels and frequencies
UHF Synthesizer Malfunction
Setting of PCLocals
Active unit : RX or TX
Operation mode : Continuous (RX) or Burst (TX)
Continuous Mode Ch: Channel will be changing
Synthesizer locked ( Control voltage depends on channel)
Test point Position Frequency *Level Note:
1 C821 ~1.5V CMch:512
1 C821 ~2.0V CMch:661
1 C821 ~2.6V CMch:810
Voltages of synthesizer N820 :
Test point Position Frequency *Level Note:
2 N820 pins 1,20 DC 4.0V Pow. supply
3 N820 pins 2,19 DC 4.6V Charge pump
UHF VCO (G1) output:
Test point Position Frequency *Level Note:
4 RFOUT DC 4.6V Vcc
5 ” 1617.2 MHz RX / CMch:512
5 ” 1647.0 MHz RX / CMch:661
5 ” 1676.8 MHz RX / CMch:810
5 ” 1650.2 MHz TX / CMch:512
5 ” 1680.0 MHz TX / CMch:661
5 ” 1709.8 MHz TX / CMch:810