User's Manual

SECTION 3: FACTORY TEST PROCEDURE
IPM8-FCCRpt.doc Page 14
Adjustment / Alignment Procedures
Receiver Injection
Perform the following steps to adjust the receiver injection and injection frequency:
Step 1 While monitoring the receiver injection frequency at C206 pin 1, adjust potentiometer R186
for minimum frequency error of +/- 100Hz. Record this value on the Test Data Sheet.
Receiver 1
Perform the following steps to adjust receiver 1:
Step1 Inject an on-frequency carrier signal with an amplitude of -80 dBm, modulated with a 1 kHz
test tone at +/- 5.0 kHz deviation into receiver 1's antenna port.
Step 2 While monitoring the voltage at RSSI1 Test Point with a DMM, adjust trimmer capacitor CV1
to midway between the points where the oscillation stops.
Step 3 While monitoring the DC level of the recovered modulation, adjust potentiometer R82 for a
reading of 2.500 VDC +/- 1 mV DC.
Step 4 While monitoring the amplitude of the recovered audio signal, adjust potentiometer R81 and
R82 for a reading of 350 mV RMS and 2.500 VDC.
Step 5 Steps 3 and 4 are interactive adjustments, therefore repeat steps 3 and 4 until further
adjustment is no longer required (i.e. when 350 mV RMS and 2.500 VDC are realized).
Step 6 While monitoring the recovered audio signal at TP1, verify the distortion is less than 3.5%,
adjust CV1 if necessary to achieve less than 3.5% distortion. Record this value on the Test
Data Sheet.
 If CV1 is adjusted to minimize 3.5% distortion, then repeat steps 3 to 5 to readjust AC-DC
levels.
Step 7 While monitoring the recovered audio signal at TP1, verify the SINAD is -117 dBm or better.
Record this value on the Test Data Sheet.