User Manual

SECTION 2: FACTORY TEST PROCEDURE
~\Technical Documentation\System Manuals\FCC-Reports\IP1HPV\IP1HPV-FCCRpt.doc Page 12
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 RXINJ1, adjust potentiometer RV3 for
minimum frequency error of +/- 100Hz. Record this value on the Mobile Radio Performance
Test Data Sheet.
Step 2 While monitoring the 44.545 MHz 2nd injection frequency at U34 pin 4, adjust trimmer
capacitor CV1 for the maximum amplitude of this injection frequency. The maximum
amplitude must be between -3 to -5 dBm. Record this value on the Mobile Radio
Performance 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 the two (2) poles of
filter FLT7 for the maximum RSSI voltage. These two (2) poles are interactive; therefore,
continue adjusting first one pole and then the other until no further improvement in RSSI
voltage can be made.
Step 3 Repeat the above procedure on FLT8 (adjusting both poles) The two (2) poles of FLT8 are
interactive; continue adjusting both poles until no further improvement can be made in the
RSSI voltage.
Step 4 While monitoring the voltage at RSSI1 Test Point with a DMM, adjust trimmer capacitor CV1A
for the maximum RSSI voltage. The RSSI value should be between 2.8 to 3.0 VDC for a
properly tuned radio. Record this value on the Mobile Radio Performance Test Data
Sheet.
Step 5 While monitoring the DC level of the recovered modulation, adjust potentiometer R82 for a
reading of 2.500 VDC +/- 1 mV DC.
Step 6 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 7 While monitoring the recovered audio signal at TP1, verify the distortion is less than 3%,
adjust CV1 if necessary to achieve less than 3% distortion. Record this value on the Mobile
Radio Performance Test Data Sheet.
Step 8 While monitoring the recovered audio signal at TP1, verify the SINAD is -119 dBm or better.
Record this value on the Mobile Radio Performance Test Data Sheet.
Step 9 R81 and R82 are interactive adjustments; therefore, continue adjusting R81 and R82 until the
Audio AC and DC Amplitudes are within the respective limits. Record these values on the
Mobile Radio Performance Test Data Sheet.