TM-600 SERVICE MANUAL
71
3. Tuning
Some items can be tuned in conventional mode and the others in manual adjustment mode.
Turn on the power to enter conventional mode.
Switch off the power. And then turn on the power while holding down [P1]. The radio enter manual
adjustment mode. The tuning item is displayed on LED.
Frequency Table
TM-600VHF:136-174MHz TM-600U1:400-470MHz
TM-600U2:450-500MHz TM-600U3:470-520MHz
TM-600U4:350-400MHz TM-600U5:440-470MHz
VCO
Item Condition
Measurement Tuning
Specification/Remarks
Test Instrument Terminal Part Method
1. Power
Supply
1. Power
supply
voltage DC
13.6V
Note: 1. This radio can only be installed in negative
grounding electrical system. Reverse polarity will cause the
cable fuse to blow. Check the vehicle ground polarity before
the installation to avoid wasted time and effort.
2. If the DC power is controlled by the vehicle ignition switch,
then the power on procedure is controlled by the input
control pulse signal of the car ignitor.
2.VCO Lock
Voltage (Tx )
1.CH: TX HI
Digital Voltmeter
CV
TC1
VHF:6.0V±0.1V
UHF: U1 6.1V±0.1V
U2 5.0 V±0.1V
U3,U4 5.1V±0.1V
U5 4.0 V±0.1V
2.CH: TX LO Check >1.0V
3. VCO Lock
Voltage (Rx)
1.CH: TX HI
TC2
VHF:6.0V±0.1V
UHF: U1,U3,U4 6.0±0.1V
U2 6.5V V±0.1V
U5 4.0V V±0.1V
2.CH: RX LO Check >1.0V
Model RX/TX 1 ( C ) 2 ( L ) 3 ( H ) 4 5 6 7 8
0 RX(MHz) 155.15 136.15 173.85 145.55 164.5 155 155.2 155.4
(V) TX(MHz) 155 136 174 145.5 164.5 155 155.2 155.4
1 RX(MHz) 435.15 400.15 469.85 417.55 452.5 435 435.2 435.4
(U1) TX(MHz) 435 400 470 417.5 452.5 435 435.2 435.4
2 RX(MHz) 475.15 450.15 499.85 462.55 487.5 475 475.2 475.4
(U2) TX(MHz) 475 450 500 462.5 487.5 475 475.2 475.4
3 RX(MHz) 495.15 470.15 519.85 482.55 507.50 495.00 495.20 495.40
(U3) TX(MHz) 495.00 470.00 520.00 482.50 507.50 495.00 495.20 495.40
4 RX(MHz) 375.15 350.15 399.85 362.55 387.5 375 375.2 375.4
(U4) TX(MHz) 375 350 400 362.5 387.5 375 375.2 375.4
5 RX(MHz) 455.15 440.15 469.85 447.55 462.5 455 455.2 455.4
(U5) TX(MHz) 455 440 470 447.5 462.5 455 455.2 455.4