Tn Tx Limiting Po Cell (Or Pcs) Is95, Low Channel (Or Lowmid, Midlow, Mid, Midhigh, Highmid, Or High Channel); Tn Tx Limiting Cell (Or Pcs) Cdma2000: Po - Nokia NPD-1 Series Troubleshooting - Rf
Transceivers
Hide thumbs
Also See for NPD-1 Series:
- Troubleshooting - bb (42 pages) ,
- Assembly (10 pages) ,
- Troubleshooting - antenna (8 pages)
Table of Contents
Advertisement
CCS Technical Documentation
Manual Verification: Use the same method as for the cell band described in the TN TX RF
AGC Cell Po (0) section, but set the phone to transmit in PCS on channel 600.
Troubleshooting: Check Robin (N801) according to Tables 1, 4, and 5. Also check D400,
which generates the PDM signals.
TN TX Limiting Po Cell (or PCS) IS95, Low channel (or LowMid, MidLow, Mid,
MidHigh, HighMid, or High channel)
This tuning provides an upper limit on the transmit power while in Cell (or PCS) IS95
mode. This ensures that the phone never violates the Specific Absorption Ratio (SAR)
limit, which is a health and safety specification that limits the amount of radiation near
the user's head. The phone is set to transmit and TxdBCtr is adjusted for the maximum
transmit power.
The result is a power level in dBm, which is the maximum allowed. This is done on each
of the seven channels.
Manual Verification: Using Phoenix, set the phone to local mode, then turn on the Cell
(or PCS) transmitter set to each of the channels in the list below.
Using the RF Tuning window, adjust TxdBCtr in the "values" dialog box until the TX power
— measured on the RF connector with a spectrum analyzer — is within the limits on each
of the following channels.
Channel
Low
LowMid
MidLow
Mid
MidHigh
HighMid
High
Troubleshooting: If the maximum cannot be reached, either a component in the trans-
mitter has too much loss, or not enough gain. Troubleshoot the Cell (PCS) transmitter,
with the phone set to the same channel as the failed channel.
TN TX Limiting Cell (or PCS) CDMA2000: Po
Same as previous tuning, except that CDMA2000 (C2K) modulation is used instead of
IS95.
Explanation of Result: See previous tuning.
Issue 1 11/2002
Cell
PCS
991
25
107
200
245
400
384
600
512
800
660
1000
799
1199 (1199 not a voice channel,
but used in tuning)
Nokia Corporation
Troubleshooting — RF
Confidential
NPD-1
Page 23
Advertisement
Table of Contents
Troubleshooting
