Alignment Procedures - Cobra MR HH325VP Service Manual

This unit has been fully aligned at the factory before shipment and does not normally require further adjustment.
When necessary, however, the unit may be aligned as indicated below.
Do not adjust any circuit in this radiotelephone unless you understand the circuit operation and have
experience in adjusting the radiotelephone. Tampering with the radiotelephone may upset the alignment and
lower its performance.
The test equipment listed below are used for the test setup shown in Fig. 3.1.
This test setup used either partially or totally during the following adjustments.
Test Equipment
1) DC Power Supply (7.2V DC)
2) RF Power Meter
3) RF Signal Generator
4) FM Linear Detector (FMLD)
5) Frequency Counter
6) Oscilloscope
7) Distortion Meter
8) Sinadder
9) Audio Oscillator
10) Toggle Switch (for use as PTT switch).
Fig. 3.1
AUDIO OSC
PTT
SWITCH
ALIGNMENT AND PROCEDURES
DC POWER
SUPPLY
MIC
UNIT
UNDER TEST
ANT
RX
TX
RF SG
0 - 15V 3A max.
10 W 50 Ohm 100-200 MHz
100-200 MHz, 50 ohm termination
100-200 MHz
1-500 MHz
20 MHz
OSCILLOSCOPE
SPEAKER
JACK
COUPLER
RF POWER
METER
8
SINADDER
DISTORT
FMLD
METER
FREQ
COUNTER