TEKCOM Industries Limited
Page 4 of 6
ALIGNMENT AND ADJUSTMENT
This transceiver is completely aligned at the factory and does not require any adjustments for installation.
However it is considered as good practice to verify that none of the adjustments are changed.
Do not adjust any circuitry in this radiotelephone unless you understand the circuit operation and have
experience in adjusting radiotelephone. Tampering with the radiotelephone may upset the alignment and
lower its performance.
Test Equipment Required:
!"
Regulated DC power supply, 15V,7A
!"
Audio signal generator,10Hz~3kHz
!"
Digital multimeter
!"
Deviation meter
!"
Frequency counter,0~500MHz high impedance
!"
Oscilloscope
!"
RF power meter,
≥
30W
!"
High frequency standard generator,>500MHz
!"
Tracking generator,>500MHz
!"
Distortion analyzer
!"
Audio level meter
!"
T-coupler
!"
Alignment drivers, etc.
ADJUSTMENT PROCEDURE
Step Item
Adjustment
Procedure
1
TX Frequency
VC2
Adjust VC2 to obtain demanded TX frequency.
2
TX Power Hi
VR5
Adjust VR5 to obtain demanded TX power 23
±
2W.
3
TX Power Lo
VR6
Adjust VR6 to obtain demanded TX power 0.8
±
0.1 W.
4
TX. Dev.
VR3
1.
Inject an audio frequency (AF) -20dBm.
2.
Adjust VR3 to obtain maximum TX deviation
≤
5kHz.
3. Check MIC modulation sensitivity, which should be
2.5~10mV.
5 RX
L10,L11,L12,
L13,L14,T1,T2
1. Check RX sensitivity if it is normal.
2. Adjust L10, L11, L12, and L13 to obtain Best Frequency
response.
3. Adjust L14,T1 and T2 to obtain Best RX sensitivity
