Motorola V200 Service Manual page 42

Troubleshooting
38
RX Hum and Noise
Table 10. RX Hum and Noise Test Values
RX Hum & Noise
Upper limit
Lower limit
• Select the SUSPEND button to put the phone into Suspend Mode.
• Under CP_MODE, select the AMPS button to place the transceiver into Analog
call processing mode.
• Under the LOAD_SYN heading, enter desired channel and select the Set Chan
button to tune the UUT to the TEST_CHANNEL
• Under AUD_PATH heading, set Input to 3 and Output to 4, and select SET.
• Set AUD_LVL to level 4.
• Under AUD_CTRL, select Sidetone OFF.
• Under COMPD, select Compander OFF.
• Under SET_RF_PWR, set transceiver to power step 2.
• Under CARRIER, select ON to enable the analog carrier.
• See Figure 14.
• Set up the test set as follows: apply an analog RF input signal at -50 dBm mod-
ulated with a 1004 Hz at 8 kHz deviation. Set the audio analyzer for 15 kHz
LPF, C-message filtering, de-emphasis OFF, and RMS detector.
• Measure the received audio signal at the audio out pin of the accessory connec-
tor. Reference the audio analyzer to the 1004 Hz tone. Remove the 1004Hz
modulated tone from the RF input signal. Measure the change in received
audio level in dB with respect to the reference. The measured change in signal
level must meet the specifications defined in Table 10.
October 04, 2001
CDMA V200
Level (dB)
-38
-99
6881039B10