User Manual

SECTION 2: FACTORY TEST PROCEDURE
~\Technical Documentation\System Manuals\FCC-Reports\IP8HPV\IP8HPV-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 C64, adjust potentiometer RV3 for
minimum frequency error of +/- 100Hz. Record this value on the Mobile Radio Performance
Test Data Sheet.
Step 2 RX1 - While monitoring the 44.545 MHz 2nd injection frequency at U33 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.
Step 3 RX2 – While monitoring the 44.545 MHz 2nd injection frequency at U34 pin 4, adjust trimmer
capacitor C159 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 The RSSI value should be between 1.3 and 1.5 VDC for a properly tuned radio. Record this
value on the Mobile Radio Performance Test Data Sheet.
Step 3 While monitoring the DC level of the recovered modulation at TP1, adjust potentiometer R82
for 2.500 VDC +/- 1 mV DC.
Step 4 While monitoring the amplitude of the recovered audio signal at TP1, adjust potentiometer
R81 for 350 mV RMS +/- 1 mV RMS.
Step 5 While monitoring the recovered audio signal at TP1, verify the distortion is less than 3%.
Record this value on the Mobile Radio Performance Test Data Sheet.
Step 6 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 7 R81 and R82 are interactive adjustments; therefore, continue adjusting R81 and R82 until the
Audio AC & DC Amplitudes are within the respective limits. Record these values on the
Mobile Radio Performance Test Data Sheet.