User Guide

CC Technical Documentation Troubleshooting - RF (Part 2)

RM-11

Check for the presence of the signal at the following points (use a high-impedance

RF probe):

• CLK19M2_B, clock reference to Batman, should be +4.5dBm

• CLK19M2_R, clock reference to Robin, should be +4.5dBm

• CLK19M2_UPP, clock reference to UPP, should be +7.5dBm

Figure 4: Presence of signal test points

If you do not see the VCTCXO signal at any of these points, check the voltages at the

following supply lines:

• VR3, main supply line for VCTCXO circuitry, should be 2.78VDC

• VIO, supply line for buffer amplifier, should be 1.8VDC

VR3 = 2.78VDC

VIO = 1.8VDC

To Batman PLL

19.2 MHz @ +4.5 dBm

(CLK19M2_B)

VCTCXO

To Robin PLL

19.2 MHz @ +4.5 dBm

(CLK19M2_R)

To Baseband UPP

19.2 MHz @ +7.5 dBm

(CLK19M2_UPP)