HYT TM-600 Guide

Adjustment Description
I. Key Functions
1-1 Front Panel
① Volume Knob
② Low Power Indicator
③ Scan Indicator
④ Channel Display Numeric LED
⑤ Channel Up Key
⑥ Channel Down Key
⑦ Rx/Tx Indicator
⑧ On/Off Key
⑨ P2 Key
⑩ P1 Key
⑪ Mic Jack
1-2 Panel Test Mode
■When the function is off
Controls Functions Description
Up Channel Up
Down Channel Down
PF1 Squelch On/Off
PF2 Channel scan
Selector Knob Volume tuning

1-3 Panel Tuning Mode
Controls Function Description
Up Tuning value up
Down Tuning value down
PF1 Test/Tuning mode toggle
PF2 Save tuning value, then move to the
next item.
Selector Knob No function.
II. Panel Test Mode
Measure the transceiver’s Tx output, Rx sensitivity and other items. CTCSS, CDCSS,
2-Tone, MSK and DTMF signalling are decoded in this mode.
2-1 To Enter the Test Mode
Press [P1] key to power on and enter test mode.
2-2 Test Frequency Channel (MHz)
In this mode, the test channel frequency (Center (C), Low (L), High (H) frequency) can be
modified via the programming software.
Model RX/TX 1 (C) 2 (L) 3 (H) 4 5 6 7 8
0 RX(MHz) 155.15 136.15 173.85 145.55 164.50 155.00 155.20 155.40
（V）TX(MHz) 155.00 136.00 174.00 145.50 164.50 155.00 155.20 155.40
III. Panel Tuning Mode
The transceiver is adjusted in this mode.
3-1 To Enter the Panel Tuning Mode
Press the [P2] key in the panel test mode.
Within the adjustment items, all the frequency and signalling, other than the maximum
deviation and sensitivity, return to the values valid for the test frequency channel and test
signalling channel before entering the panel tuning mode.
No. Dealer Mode LED Display
1 Tx high power 0
2 Tx low power 1
3 Max. frequency deviation 2
4 CDCSS balance 3
5 CTCSS frequency deviation (67.0Hz) 4

6 CTCSS frequency deviation (151.4Hz) 5
7 CTCSS frequency deviation (254.1Hz) 6
6 CDCSS frequency deviation 7
7 DTMF frequency deviation 8
8 MSK frequency deviation 9
9 Single tone frequency deviation A
10 Rx sensitivity B
11 Squelch on level (Level 9) C
12 Squelch on level (Level 3) D
13 Squelch off level (Level 9) E
14 Squelch off level (Level 3) F
3-2. Tuning Items and Display
Items Wide/Narrow
Band Frequency LED Display Signalling
Center 0.No signalling
Low 1.No signalling
High Power
Wide Band
High 2.No signalling
Center 0.No signalling
Low 1.No signalling
Tx Frequency
Medium Power
Wide Band
High 2.No signalling
Center 0.No signalling
Low 1.No signalling
Wide Band
High 2.No signalling
Medium Band Center 3.No signalling
Max Frequency
Deviation
Narrow Band Center 4.No signalling
Center 0.Square wave 100Hz
Low 1.Square wave 100Hz
Wide Band
High 2.Square wave 100Hz
Medium Band Center 3.Square wave 100Hz
CDCSS
Balance
Narrow Band Center 4.Square wave 100Hz
Center 0.CTCSS: 67.0Hz
Low 1.CTCSS: 67.0Hz
Wide Band
High 2.CTCSS: 67.0Hz
Medium Band Center 3.CTCSS: 67.0Hz
Narrow Band Center 4.CTCSS: 67.0Hz
Center 0.CTCSS: 151.4Hz
CTCSS
Frequency
Deviation
Wide Band
Low 1.CTCSS: 151.4Hz

High 2.CTCSS: 151.4Hz
Medium Band Center 3.CTCSS: 151.4Hz
Narrow Band Center 4.CTCSS: 151.4Hz
Center 0.CTCSS: 254.1Hz
Low 1.CTCSS: 254.1Hz
Wide Band
High 2.CTCSS: 254.1Hz
Medium Band Center 3.CTCSS: 151.4Hz
Narrow Band Center 4.CTCSS: 254.1Hz
Center 0.CTCSS: 023N
Low 1.CTCSS: 023N
Wide Band
High 2.CTCSS: 023N
Medium Band Center 3.CTCSS: 151.4Hz
CDCSS
Frequency
Deviation
Narrow Band Center 4.CTCSS: 023N
Wide Band Center 1.DTMF: 9
Medium Band Center 3.DTMF: 9
DTMF
Frequency
Deviation Narrow Band Center 4.DTMF: 9
Wide Band Center 1.0XAAA…
Medium Band Center 3.0XAAA…
MSK Frequency
Deviation
Narrow Band Center 4.0XAAA…
Wide Band Center 1.1KHz
Medium Band Center 3.1KHz
Single Tone
Frequency
Deviation Narrow Band Center 4.1KHz
- Low
1.No signalling; SQ deactivated
- Low-medium 5.No signalling; SQ deactivated
- Center 0.No signalling; SQ deactivated
- Medium-high 6.No signalling; SQ deactivated
Rx Sensitivity
- High 2.No signalling; SQ deactivated
Center 0.No signalling
Low 1.No signalling
Level 9
Wide Band
High 2.No signalling
Level 9
Medium Band
Center
3.No signalling
Level 9
Narrow Band
Center
4.No signalling
Center 0.No signalling
Squelch On/Off
Level 3
Wide Band Low 1.No signalling

High 2.No signalling
Level 3
Medium Band
Center
3.No signalling
Level 3
Narrow Band
Center
4.No signalling
Center 0.No signalling
Low 1.No signalling
Level 9
Wide Band
High 2.No signalling
Level 9
Medium Band
Center
3.No signalling
Level 9
Narrow Band
Center
4.No signalling
Center 0.No signalling
Low 1.No signalling
Level 3
Wide Band
High 2.No signalling
Level 3
Medium Band
Center
3.No signalling
Level 3
Narrow Band
Center
4.No signalling
3-3. Flow Chart
1. Use “UP”, “DN” keys to adjust the value (1 to 256).
2. Press [P2] key to move to the next item.

0(High power)
2(Max. deviation)
CDCSS Balance
0. (Center)
1. (Low)
2. (High)
Max. deviation (Center)
Max. deviation (Low)
Max. deviation (High)
[P2]
Rotate select
knob
0.(Center)
1. (Low)
2. (High)
[P2]
[P2] [P2]
[P2]
[P2] [P2]
TX low power (narrow
Center)
[PF6]
[PF6]
[PF6]
[PF6]
CDCSS Balance (Center)
CDCSS Balance(Low)
CDCSS Balance(High)
CDCSS Balance(narrow
Center)
[PF6]
[PF6]
[PF6]
[PF6]
Rotate select knob
Rotate select knob
CTCSS deviation
MSK deviation
Sensitivity
open Squelch
Close Squelch
DTMF deviation
Single tone deviation
CDCSS deviation CDCSS deviation(Center)
CDCSS deviation(Low)
CDCSS deviation(High)
CDCSS deviation(narrow
Center)
[PF6]
[PF6]
[PF6]
[PF6]
DTMF deviation
DTMF deviation(narrow)
[PF6]
[PF6]
MSK deviation
MSK deviation(narrow)
[PF6]
[PF6]
Tone deviation
Tone deviation(narrow)
[PF6]
[PF6]
Rx Sensitivity(Low)
Rx Sensitivity(CL)
Rx Sensitivity(Center)
Rx Sensitivity(HC)
[PF6]
[PF6]
[PF6]
[PF6]
open Squelch(Center)
open Squelch(Low)
open Squelch(High)
open Squelch(narrow
Center)
[PF6]
[PF6]
[PF6]
[PF6]
Close Squelch (Center)
Close Squelch (Low)
Close Squelch (High)
Close Squelch (narrow
Center)
[PF6]
[PF6]
[PF6]
[PF6]
Rotate select knob
Rotate select knob
Rotate select knob
Rotate select knob
Rotate select knob
[PF6]
[PF6]
[PF6]
[PF6]
[PF6]
Rx Sensitivity(High)
[PF6]
[PF6]
CTCSS deviation(Center)
CTCSS deviation(Low)
CTCSS deviation(High)
CTCSS deviation(narrow
Center)
[PF6]
[PF6]
[PF6]
[PF6]
[P2]
[PF6]
Rotate select knob Rotate select knob
[P2]
[PF6]
[PF6]
Panel test mode
[P1]+Power ON
[P2]
Rotate select knob
1(Low power)
[UP]
[UP]

IV. Test Instrument for Alignment
Instrument Method Major Specifications
Standard Signal
Generator (SSG)
Frequency
Modulation
Output power
136 to 174 MHz
Frequency modulation and external modulation
0.1uV to 1mV above
Power Meter Input Impedance
Operation Frequency
Measurement Capability
50Ω
136 to 174 MHz or above
About 50W
Digital Voltmeter (DVM) Measuring Range
Accuracy
1 to 20V DC
High input impedance for minimum circuit loading
Oscilloscope DC to 30MHz AC
High Sensitivity
Frequency Counter
Frequency Range
Frequency Stability
10Hz to 600MHz
0.2ppm or below
Ammeter 13A or above
AF Voltmeter
(AF VTVM)
Frequency Range
Voltage Range
50Hz to 10kHz
3mV to 3V
Audio Generator (AG) Frequency Range
Output Power
50Hz to 5kHz
0 to 1V
Distortion Meter Measurement Capability
Input Level
1kHz above 3% or less
50mV to 10Vrms
Voltmeter Frequency Range
Input Impedance
10 to 1.5V DC or less
50kΩ/V or more
4ΩDummy Load About 4Ω, 20W
Regulated Power 13.6V, about 20A (adjustable from 9 to 20V)
Applicable if antenna required
4-1 Test Cable for Speaker Output
4-2 Test Cable for Microphone Input
The following test cable is recommended.

V. Cautions When Removing or Attaching the Shield Cover
1. When handling with the shield cover, do not damage the components on the TX-RX unit.
2. When installing the shield cover, insert the cover from the rear side.
3. When removing the shield cover, squeeze the hole marked with an arrow as shown in the
diagram and pull it straight up.
This mobile radio can only be adjusted via programming software or manually. Manual
adjustment is described as follows. (Refer to ‘Test Mode” and ‘Adjustment Mode” in the
section Radio Modes.)
Instrument:
Radio Communication Test Set 1 set
SpectrumAnalyzer 1set
20A/30V Power Supply 1 set
DigitalVoltmeter 1set
PowerMeter 1set
Signal Line (with dummy load) 1 set
Adjustment:
1. Download
● Connect the radio with PC by programming cable; turn the radio on.
● Click “Download” on software interface.
● Select the desired program and click “Open”, download starts.
● Click “End” when download is completed.
● Turn the radio off and remove the programming cable.
2. Initialization
It is necessary to set the frequency and initialize the radio before adjustment because there

is no needed information in EEPROM when the radio is manufactured.
● Turn on the power while holding down [P2], and re-press it after the LED displays “0”.
● The LED on the control panel finishes flashing, indicating that the initialization is over.
3. Adjustment
Some items can be adjusted in conventional mode and the others in manual adjust 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 CH number is displayed on LED.
● Frequency Table
Model RX/TX 1 (C) 2 (L) 3 (H) 4 5 6 7 8
0 RX(MHz) 155.15 136.15 173.85 145.55 164.50 155.00 155.20 155.40
(V) TX(MHz) 155.00 136.00 174.00 145.50 164.50 155.00 155.20 155.40

VCO
Measurement Adjustment
Item Condition
Test Instrument Terminal Part Method
Specification/R
emarks
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 DC power is to be controlled by the vehicle ignition switch, a
switch relay should be used to switch the positive power lead. The
vehicle ignition switch then controls DC to the relay coil.
1.CH: TX HI 6.0V±0.1V
2. VCO Lock
Voltage (Tx) 2.CH: TX LO TC1 Check ＞1.0V
1.CH: RX HI 6.0V±0.1V
3. VCO Lock
Voltage (Rx) 2.CH: RX LO
Digital Voltmeter CV
TC2 Check ＞1.3V
Transmitter
Measurement Adjustment
Item Condition
Test Instrument Terminal Part Method
Specification
/Remarks
4. TX
Frequency
Not enter adjustment
item, but switch to 2CH
Radio
Communication
Test Set
ANT Adjust VR801 Adjust channel
frequency Error<50Hz
High Power:
PO=23~25WW
I≤8.0A
Check High
Power
5. TX Power
Each CH corresponds
to a specific TX freq;
enter the item “0”, ‘1” in
turn, to adjust High/Low
power.
Radio
Communication
Test Set
Ammeter
ANT
Adjust software
setting &
VR101; press
[P2] to save the
setting and
move to the
next item.
Low Power:
PO=5±0.5W
I≤5.0A
Check Low
Power
Check the deviation of
Hi/Mid/Low channel:
4.0±0.1KHz(W)
Check the deviation of
Hi/Mid/Low channel:
2.4±0.1KHz(W)
6. Max.
Deviation
1. Each CH
corresponds to a
specific TX freq; enter
the item “2” and adjust
“0.”、“1.”、“2.”、“3.”、
“4.”
Radio
Communication
Test Set
Filter:
0.05-15KHz
AF：1KHz
75mV
ANT
MIC Jack
Adjust software
setting; press
[P2] to save the
setting and
move to the
next item.
Check the deviation of
Hi/Mid/Low channel:
1. 9±0.1KHz (N)

7. Modulation
Sensitivity
Check deviation:
2.6KHz-3.4KHz (W)
2.2KHz-2.7KHz (M)
1.3KHz-1.7KHz (N)
8. Modulation
Distortion
1. Each CH
corresponds to a
specific TX freq.
Radio
Communication
Test Set
Filter:
0.05-15KHz
AF: 1KHz
7.5mV
ANT
MIC Jack
≤5%
Check
9. CDCSS
Balance
Each CH corresponds
to a specific TX freq;
enter item “3”
Radio
Communication
Test Set
Filter
LPF: 300Hz
ANT
Use “UP”, “DN”
key to set
CDCSS
Check
waveform
10. CTCSS
Deviation
Each CH corresponds
to a specific TX freq;
enter item “4”, “5”, “6”;
adjust
67Hz/151.4Hz/254.1Hz
CTCSS
Radio
Communication
Test Set
Filter
LPF: 300Hz
ANT
Use “UP”, “DN”
key to set
CDCSS
Adjust deviation to
0.75KHz±0.10KHz (W)
0.60KHz±0.10KHz (M)
0.37KHz±0.05KHz (N)
11. CDCSS
Deviation
Each CH corresponds
to a specific TX freq;
enter item “7"
Radio
Communication
Test Set
Filter
LPF: 300Hz
ANT
Use “UP”, “DN”
key to set
CDCSS
Adjust deviation to
0.75KHz±0.10KHz (W)
0.60KHz±0.10KHz (M)
0.37KHz±0.05KHz (N)
12.DTMF
Deviation
Each CH corresponds
to a specific TX freq;
enter item “8"
Radio
Communication
Test Set
Filter
LPF: 3KHz
ANT
Use “UP”, “DN”
key to set
CDCSS
3.0KHz±0.1KHz (W)
2.4KHz±0.1KHz (M)
1.5KHz±0.1KHz (N)
13. MSK
Each CH corresponds
to a specific TX freq;
enter item “9"
Radio
Communication
Test Set
Filter
LPF: 3KHz
ANT
Use “UP”, “DN”
key to set
CDCSS
3.0KHz±0.1KHz (W)
2.4KHz±0.1KHz (M)
1.5KHz±0.1KHz (N)
14. Single
tone
(2-/5-tone)
Each CH corresponds
to a specific TX freq;
enter item “A"
Radio
Communication
Test Set
Filter
LPF: 3KHz
ANT
Use “UP”, “DN”
key to set
CDCSS
Adjust deviation to
3.0KHz±0.10KHz (W)
2.4KHz±0.10KHz (M)
1.5KHz±0.1KHz (N)

Receiver
Measurement Adjustment
Item Condition
Test Instrument Terminal Part Method
Specification
/Remarks
15. RF
bandpass filter
Enter item “B”; Each CH
corresponds to a specific
TX freq.
Scanner ANT . TP1
First
manually
adjust
TC101, then
the software
setting
Set the gain
value to the
max; the
corresponding
freq is on the
rightmost of the
bandpass wave.
Press [P2] key to
save.
16. Max.
SINAD
Frequency: RX Center;
adjust to CH1(C);
corresponds to a specific
freq.
Radio
Communication
Test Set
SSG Output:
-47dBm
MOD: 1KHz
DEV: ±3KHz(W)
±1.5KHz(N)
Filter:
0.3-3.0KHz
ANT
SP Jack
K301
Check Max.
volume:
4.6V or above
1. CH: RX Center,
manually adjust to CH
1(C).
2. CH: RX LO, manually
adjust to CH 2 (L).
17. Sensitivity
3. CH: RX HI, manually
adjust to CH3 (H).
Radio
Communication
Test Set
SSG Output:
-116dBm
MOD: 1KHz
DEV: ±3KHz(W)
±2.4KHz(M)
±1.5KHz(N)
Filter:0.3-3.0KHz
ANT
SP Jack
Wide/narro
w
band switch
(turn on the
power while
holding [P1]
key to enter
CH setting
mode)
[P2] key for CH
adjustment
Check
SINAD:
12dB or
above
19. SQ Open
Enter in turn the item “C”
(Level 9 on), “D” (Level 3
on); adjust CH to “0.”, “1.”,
“2.”, “3.”, “4.”
Radio
Communication
Test Set
SSG Output:
-119dBm (Level 3)
ANT
SP Jack
Adjust
software
setting
No need to adjust
software setting
at SQ Level 3/9;
press [P2] twice
to save.
Continuously
press[P2] key
twice for CPU
reading and
writing; SQ

SSG Output:
-112dBm (Level 9)
level
Radio
Communication
Test Set
SSG Output:
-123dBm (Level 3)
20. SQ Close
Enter in turn the item “C”
(Level 9 off), “D” (Level 3
off); adjust CH to “0.”, “1.”,
“2.”, “3.”, “4.”
SSG Output:
-115dBm (Level 9)
No need to adjust
software setting
at SQ Level 3/9;
press [P2] twice
to save.
Continuously
press[P2]
key twice fo
r
CPU reading
and writing;
SQ level
21. Distortion DIS≤5%
22. S/N
1. Channel: RX Center
Radio
Communication
Test Set
SSG Output:
-60dBm
ANT
SP Jack
Filter:
0.3-3.0KHz Check S/N≥47 (W)
S/N≥42 (N)
Note: The radio must be covered with aluminum chassis during the adjustment of
sensitivity, Tx power, signalling waveform, frequency deviation, Rx Squelch. Connect an
RF power meter to the antenna connector during transmission. Connect the SINAD meter
with 16ohm load to the external [SP] Jack.