Tn Lna Amps (Or Cell Or Pcs) Lowgain (Or Highgain) Lo (Or Lm, Ml, Md, Mh, Hm, Hi); Final Ui Test: Rho; Final Ui Test: Frame Error Rate (Fer) - Nokia NPD-4 Series Technical Documentation Manual

CCS Technical Documentation
Manual Verification: With the phone in local mode, use the Main Mode window to turn
on the AMPS receiver set to channel 384. Using the RF Tuning window, perform the man-
ual tuning three times, each time injecting the CW signal at the amplitudes listed above
— one amplitude per tuning. Each time, record RxdBCtr, which is returned by Phoenix
during the manual tuning. For the manual tuning, use the RF Tuning window with
"mode"=RF Tuning, and choose the appropriate tuning name. Ensure that the resulting
value of RxdBCtr is within the limits in the tuning results file.
Troubleshooting: While injecting a signal into the receiver, check the values of RSSI and
RX_IF_AGC PDM value and, if needed, voltage. RSSI should be within +/- 2 dB of the
actual power in dBm on the RF connector. Table 3a lists limits and typical values. The
AGC will try to keep the same amplitude on Batman output; therefore, if the AGC value
is larger than normal, then the AGC is compensating for loss in the chain prior to the
variable gain amplifier.
After checking RSSI and AGC value, if it is still necessary to probe to pinpoint the source
of the error, use the AMPS probing tables.
TN LNA AMPS (or Cell or PCS) LowGain (or HighGain) LO (or LM, ML, MD,
MH, HM, HI)
This tuning records RxdBCtr (which is automatically adjusted to produce the same ampli-
tude on the receiver output no matter what the input is) for the receiver with the LNA in
highgain mode, and again with the LNA in lowgain mode. For AMPS, this is done only on
the center channel, but for Cell and PCS it is done over several channels.
The result is a value of RxdBCtr.
Manual Verification: Using Phoenix, choose this tuning in the RF Tuning window. Inject a
CW signal that is 10 kHz offset from the center frequency of the channel that is being
tuned. For AMPS, set the amplitude to –65 dBm, for Cell and PCS set it to –95 dBm.
Record RxdBCtr, which is returned from Phoenix in the lowest field in the RF Tuning win-
dow.
Troubleshooting: Check Alfred and supporting components.

Final UI test: Rho

Rho is a measure of CDMA transmit signal quality which encompasses other transmitter
indicators such as phase error and magnitude error. Rho is measured with the phone in a
phonecall, and is read directly from the call box. Rho is measured with sector power=
75 dBm. If Rho fails, first check the signal purity of the LOs. Check synthesizer compo-
nents and power supply decoupling.

Final UI test: Frame Error Rate (FER)

This measurement — also made in a phone call — measures the frame errors of the
receiver in CDMA mode. A low amplitude signal (typically at receiver sensitivity level of
-104.0 dBm) is injected into the receiver, and the FER is recorded. FER is measured in
percentage, and 0.5 % or lower is passing (w/ 95% confidence). Failures are most often
Issue 1 02/2003
Nokia Corporation
Troubleshooting — RF
Confidential
NPD-4
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