User Guide

CCS Technical Documentation RF Troubleshooting Instructions
Issue 1 10/02 ¤Nokia Corporation Page 87
RF Service Tools
MJS-46 Module Jig
All RF tunings should be performed in MJS-46 Jig. When using Test Jig MJS-46, the ref-
erence level attenuation is 0.1 dB + cable loss.
JVB-1 Docking Station, MJF-6 Adapter and coupler CPL-9
The reference level attenuation for Docking Station JBV-1 + MJF-6 adapter with antenna
coupler CPL-9 is approximately 4 dB +cable loss.There can be minor differences between
CPL-9 antenna couplers, but maximum distribution is +-0.3dBm. Attenuation can vary
between antenna couplers. There is differences in attenuations between low and high
channel, but those can be ignored.
Coupler attenuation calibration
When Docking Station with MJF-6 and CPL-9 inside the shield box JSX-1 is used, then
calibration procedure is following:
• Measure one known phone in MJS-46 Module Jig in Ch 661, the output power
(P1) should be 29.5dBm +- 0.2dB. Remember the jig loss 0.1dB and cable loss.
• Assemble the measured phone in to mechanics
• Put the phone in to the JBV-1 Docking Station, without JXS-1 Shield Box
• Measure the output power (P2) in Ch 661
• The attenuation (A1) of the antenna coupler is: A1=(P1+0.5dBm)-P2
•(Note! Mechanics will increase output power 0.5dB)
Typical coupler (CPL-6) attenuation is 4.0dB. If measurements are done without JXS-1
Shield Box, the same value can be used in TX and RX.
If using shielded box JSX-1, additional loss is needed separately for LO, MID and HI
Channels. Typical loss values are: LO= 5.7dB, MID=2.3dB and HI=0.5dB
Functionality Testing Limits
When checking the phone’s functionality in the JBV-1 docking station with a coupler,
the TX power may vary to some degree. TX power levels 14 and 15 should be ignored, as
the coupler’s response is not reliable. The following table lists the TX output power toler-
ances, when CPL-6 is used for measuring: