Kenwood NX-5600HB User manual

SERVICE MANUAL
COPYRIGHT © 2019 JVCKENWOOD Corporation No.RA075<Rev.001>
2019/6
B5B-7318-00
VHF DIGITAL TRANSCEIVER
RA075<Rev.001>20196SERVICE MANUALB5B-7318-00
NX-5600HB
COPYRIGHT © 2019 JVC KENWOOD Corporation
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-57
This product complies with the RoHS directive for the European market. This product uses Lead Free solder.

1-2 (No.RA075<Rev.001>)
Document Copyrights
Copyright 2019 by JVC KENWOOD Corporation. All rights reserved.
No part of this manual may be reproduced, translated, distributed, or transmitted in any form or by any means, electronic,
mechanical, photocopying, recording, or otherwise, for any purpose without the prior written permission of JVC KENWOOD
Corporation.
Disclaimer
While every precaution has been taken in the preparation of this manual, JVC KENWOOD Corporation assumes no responsibility
for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein.
JVC KENWOOD Corporation reserves the right to make changes to any products herein at any time for improvement purposes.
Firmware Copyrights
The title to and ownership of copyrights for firmware embedded in KENWOOD product memories are reserved for JVC KENWOOD
Corporation. Any modifying, reverse engineering, copy, reproducing or disclosing on an Internet website of the firmware is strictly
prohibited without prior written consent of JVC KENWOOD Corporation. Furthermore, any reselling, assigning or transferring of the
firmware is also strictly prohibited without embedding the firmware in KENWOOD product memories.
Transceivers containing AMBE+2 Vocoder:
The AMBE+2 voice coding technology is embedded in the firmware under the license of Digital Voice Systems, Inc.
Bluetooth Copyrights
The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by
JVC KENWOOD Corporation is under license. Other trademarks and trade names are those of their respective owners.
TM
TM
R

(No.RA075<Rev.001>)1-3
SPECIFICATION
Analog measurements made per TIA 603, and NXDN digital measurements made per NXDN Conformance Test.
Specifications shown are typical.
JVC KENWOOD Corporation reserves the right to change specifications without prior notice or obligation.
GENERAL
Frequency Range 39~50MHz
Max. Channels per Radio 1024 (Up to 4000 channels with option)
Number of Zones 128
Max. Channels per Zone 512
Channel Spacing Analog 20kHz
Digital 12.5kHz
Operating Voltage 13.4V DC ±15%
Operating Temperature Range -22°F to +140°F (-30°C to +60°C)
Frequency Stability (-30°C to + 60°C; +25°C Ref.) ±0.5ppm
Dimensions (W x H x D) (Projections not included) 7.01 x 2.56 x 13.84 in (178 x 65 x 351.5 mm)
Weight 12.1 lbs (5.5 kg)
RECEIVER
Sensitivity NXDN 12.5kHz Digital (3% BER) 0.25μV
Analog 20kHz (12dB SINAD) 0.25μV
Selectivity Analog 85dB
Digital 57dB
Intermodulation 80dB
Spurious Rejection 90dB
Audio Distortion Less than 3%
Audio Output Power 12W / 4ohm (Remote Control Head: 3W / 4ohm)
TRANSMITTER
RF Power Output (Preset: High/Mid/Low) 110 to 25 W (110 / 70 / 25 W)
Spurious Emission -80dB
FM Hum & Noise 55dB
Audio Distortion Less than 2%
Emission Designator Analog 16K0F3E
Digital 8K30F1E, 8K30F1D, 8K30F7W

1-4 (No.RA075<Rev.001>)
SECTION 1
PRECAUTION
This service manual does not describe PRECAUTION.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 SYSTEM SET-UP
YES
RF Deck (NX-5600HB) is possible to combine and install the Remote Kit
(KRK-14H), Control Head (KCH-19, KCH-20R, KCH-21R) and Cable
(KCT-71, KCT-72) respectively.
Refer to the KRK-14H/15B service manual (B5B-7173-20) for Setup and
installation information for all combinations.
Note: The function of the KRK-15B is incorporated in the NX-5600HB.
Are you using the Multi-RF Deck/Multi-Control
Head remote kit?
NO
KCT-18
YES
(Option)
Refer to the “2.3.2 Ignition Sense
Cable (KCT-18: Option)”.
KES-5 or KES-5A
YES
(Option)
Are you using the public address?
Are you using the microphone?
NO
KES-5 or KES-5A
YES
(Option)
Delivery
Are you using the secure cryptographic module? KWD-AE30 or KWD-AE31
YES
NO
NO
NO
NO
(Option)
KMC-27A,KMC-27B,KMC-28A,
KMC-35,KMC-36,KMC-65,KMC-66
YES
(Option)
Desk top microphone KMC-9C
Frequency range (MHz) RF powerType Operation panel
TX/RX 39~50 110WNX-5600HB F3 No
NX-5600HB is complete by combining options with
only the transceiver body (without panel).
Merchandise received
Select the type of transceiver
Are you using the ignition sense cable?
KRA-40 GPS active antenna
Refer to the "2.3.3 External Speaker
(KES-5/KES-5A: Option)".
Refer to the "2.3.3.3 Use as public
address speaker".
Refer to the "2.3.5 SECURE
CRYPTOGRAPHIC MODULE
(KWD-AE30/KWD-AE31: Option)".
A personal computer, programming interface (KPG-46U/46X),
and FPU (programming software) are required for programming.
Transceiver programming
Are you using the GPS function?
KCT-23 M2,M4
YES
(Option)
NO
KCT-23 DC cable
Are you using the external speaker?

(No.RA075<Rev.001>)1-5
2.2 REALIGNMENT
2.2.1 Modes
*1:In order to use the Front panel programming mode, it is
necessary to purchase the "Front panel program" feature
option.
2.2.2 How to Enter Each Mode
*2 There is the two or three as how to enter.
2.2.3 Panel Test Mode
Setting method refer to ADJUSTMENT.
2.2.4 Panel Tuning Mode
Setting method refer to ADJUSTMENT.
Mode Function
User mode For normal use.
Panel test mode Used by the dealer to check the
fundamental characteristics.
Panel tuning mode Used by the dealer to tune the transceiver.
PC mode Used for communication between the
transceiver and PC.
Data programming
mode
Used to read and write frequency data and
other features to and from the transceiver.
PC test mode Used to check the transceiver using the
PC. This feature is included in the FPU.
Firmware
programming
mode
Used when changing the main program of
the flash memory.
Clone mode Used to transfer programming data from
one transceiver to another.
Front panel
programming
mode
Frequency, signaling and features write to
the transceiver.
Transceiver
information mode
Used to confirm the transceiver firmware
version, SCM firmware version and SCM
Hardware version.
Mode Operation
User mode Power ON
Panel test mode*2 •[ ] + Power ON
• [ ] + Power ON
Select the “Panel Test” using the [] /
[] key.
Press the [ ] key.
PC mode Received commands from PC
Panel tuning mode [Panel test mode] + [ ]
User mode
Data programming mode
PC tuning mode
Transceiver information mode
PC mode
Panel tuning mode
Panel test mode
Firmware programming mode
Clone mode
Front panel programming mode*1
PC test mode
Firmware programming
mode*2
• [AUX (Orange)] + Power ON
• [ ] + Power ON
Select the “Firmware Prog” using the
[] / [] key.
Press the [ ] key.
• If Write is performed by KFL,
Firmware programming mode will
start automatically.
Clone mode*2 • [ ] + Power ON
• [ ] + Power ON
Select the “Clone” using the [] / []
key.
Press the [ ] key.
Front panel
programming mode*2
• Press the PF key to which Front
panel programming mode is set
during the user mode.
• Press the [ ] key and enter the
Menu mode.
Select the any icon assigned the Front
panel programming mode using the
[] / [] key.
Press [ ] key.
Select the “Panel Program” using the
[] / [] key.
Press the [ ] key.
Transceiver
information mode*2
• [+] + Power ON
• [ ] + Power ON
Select the “Transceiver Info” using the
[] / [] key.
Press the [ ] key.
Mode Operation

1-6 (No.RA075<Rev.001>)
2.2.5 PC Mode
2.2.5.1 Preface
The transceiver is programmed by using a personal computer (PC), a USB programming cable (KPG-46U/46X) and a Programming
software (FPU).
The programming software can be used with a PC. Figure 1 shows the setup of a PC for programming.
Fig.1
2.2.5.2 Connection procedure
(1) Connects the transceiver to the PC using the
KPG-46U/46X.
Note:
You must install the KPG-46U/46X driver in the PC to use
the KPG-46U/46X.
(2) When the POWER is switched on, you can immediately
enter user mode. When PC sends command the
transceiver enter PC mode, and “PROGRAM” is displayed
on the LCD.
When data transmitting from the transceiver, the red LED
lights.
When data receiving to the transceiver, the green LED
lights.
Note:
The data stored in the PC must match the “Model Name”
when it is written into the flash memory.
2.2.5.3 KPG-46U/46X description (USB programming
interface cable: Option)
The KPG-46U/46X is a cable which connects to a USB port on a
PC.
When using the KPG-46U/46X, install the supplied CD (with
driver software) in the PC. The KPG-46U driver runs under
Windows 7, 8.1 or 10.
The KPG-46X driver runs under Windows 7, 8.1 or 10.
The latest version of the USB driver is available for download
from the following URL:
https://www.kenwood.com/usb-com/
(This URL may change without notice.)
2.2.5.4 Programming software KPG-D1/D1N (Ver. 3.10 or
later) description
The FPU is the programming software for the transceiver
supplied on a CD. This software runs under Windows 7, 8.1 or
10.
The data can be input to or read from the transceiver and edited
on the screen.
2.2.6 Firmware Programming Mode
2.2.6.1 Preface
Flash memory is mounted on the transceiver. This allows the
transceiver to be upgrade when new features are released in the
future. (For details on how to obtain the firmware, contact
Customer Service.)
2.2.6.2 Connection procedure
Connect the transceiver to the PC using the programming
interface (KPG-46U/46X). (Connection is same as in the PC
mode.)
2.2.6.3 Programming
(1) Start up the firmware programming software (KENWOOD
Firmware Loader). The KFL.exe exists in the KPG-D1/D1N
installed folder.
(2) Set the baud rate to "auto" or 1152000, 576000, 115200,
and 57600.
(3) Set the firmware to be upgrade by file name item.
(4) Check the connection between the transceiver and the PC.
(5) Press “Write” key in the window. When the transceiver
starts to receive data, the “LOADING” is displayed on LCD,
and the green LED lights.
(6) If writing ends successfully, the checksum is calculated
and a result is displayed on the LCD. Also the Red LED
lights.
(7) If you want to continue programming other transceivers,
repeat step (5) to (6).
Note:
If write is performed by KFL, Firmware programming mode
will start automatically even if Firmware programming is set
to disable in the programming software.
2.2.6.4 Function
If you press the [ ] key while “FIRMWARE PROG” is
displayed, the checksum is calculated, and a result is displayed.
If you press the [ ] key again while checksum is displayed,
“FIRMWARE PROG” is redisplayed.
FPU
PC
KPG-46U/46X
+ Tuning cable
(E30-7754-05)
Modular jack
NX-5600HB with
KCH-20R

(No.RA075<Rev.001>)1-7
2.2.7 Clone Mode
Programming data can be transferred from one transceiver to
another by connecting them via their modular microphone jacks.
The operation is as follows.
The following data cannot be cloned.
• Tuning data
• Embedded message with password
• ESN (Electronic Serial Number) data
Key guide on the Clone/ Front Panel Programming
Password input screen.
• Confirm ([ ] key): The password confirmation
• Delete ([ ] key): Delete the latest digit from the current
password number (Press and hold to delete all password
numbers)
• Select ([ ] key): Determine the latest digit of the password
number.
(1) In the source transceiver, enter the clone mode by using
section “2.2.2 How to Enter Each Mode”. When the Clone/
Front Panel Programming Password is set to the
transceiver, "Input Password" is displayed on the LCD.
If the password is not set, the transceiver displays "CLONE
MODE".
(2) When you enter the correct password, “CLONE MODE” is
displayed, the transceiver can be used as the cloning
source. The following describes how to enter the
password.
(3) There are two methods to enter the password as follows.
- How to enter the password using the MIC keypad;
If one of the keys 0 to 9 is pressed while the “Input
Password” is displayed, the password number is
displayed on the LCD.
Each press of the key shifts the display in order to the
left.
When you enter the password and press [ ] or [*] key,
“CLONE MODE” displayed if the entered password is
correct. If password is incorrect, “Input Password” is
redisplayed.
- How to enter password using the [] and [] keys;
If the [] / [] key is pressed while “Input Password” is
displayed, the Clone/ Front Panel Programming
Password input screen is displayed.
If the [] or [] key is pressed while the clone/ Front
Panel Programming Password input screen is displayed,
the number (0 to 9) blinks on the LCD. When you press
the [ ] key, currently selected number is determined. If
you press the [ ] key after entering password in this
procedure, “CLONE MODE” is displayed if entered
password is correct. If the password is incorrect, “Input
Password” is redisplayed.
(4) Power ON the target transceiver.
(5) Connecting the cloning cable (part No.E30-3382-05) to the
modular microphone jacks on the source and target.
(6) Press [ ] key on the source while the source displays
“CLONE MODE”. The data of the source is sent to the
target. While the target is receiving the data, “PROGRAM”
is displayed. When cloning of the data is completed, the
source displays “END”, and the target automatically
operates in the User mode. The target can then be
operated by the same program as the source.
(7) The other target can be continuously cloned. When the
[ ] key on the source is pressed while the source displays
“END”, the source displays “CLONE MODE”. Carry out the
operation in step (4) to (6).
Note:
• Cannot be cloned if the password (overwrite password) is
programmed to the target.
• “Model name” must be same to clone the transceiver.
Fig.2
2.2.8 Front Panel Programming Mode
If the Front Panel Programming Mode is used, the frequency or
other data of the conventional channel is rewritable only by the
transceiver.
Moreover, the conventional channel can be added.
The following setup items can be changed or added by
using the Front panel programming mode.
• RX/TX Frequency
• Channel Type
• Decode QT/DQT/RAN, Encode QT/DQT/RAN
• Transmit Power
• Channel Name
Key guide on the Clone/ Front Panel Programming
Password input screen.
• Confirm ([ ] key): The password confirmation
• Delete ([ ] key): Delete the latest digit from the current
password number (Press and hold to delete all password
numbers)
• Select ([ ] key): Determine the latest digit of the password
number.
2.2.8.1 How to enter the Front panel programming mode
Press the PF key which is assigned as “Panel Program” by the
FPU, or select the “Panel Program” which is assigned into the
Menu key by the FPU.
If the Clone/Front panel programming Password is not set to the
transceiver, "Panel Program" is displayed on the LCD. If the
Clone/Front panel programming Password is set to the
transceiver, "Panel Program" is displayed on the LCD when you
enter the correct password while “Input Password” is displayed.
2.2.8.2 Data Writing
Before moving to next Zone/Channel, “Keep This Change?”
appears on the LCD, if you select “OK”, the new data is written
to memory. If you select “Cancel”, the new data not be written;
the new data will be erased.
•The setup items for Front panel programming mode are as
follows.
NX-5600HB with
KCH-20R
NX-5600HB with
KCH-20R
Cloning cable
(E30-3382-05)

1-8 (No.RA075<Rev.001>)
The setup items for Front panel programming mode
 Key operation (1/3)
*3: Mixed Mode only
*4: [1] = "Analog", [2] = "NXDN", [3] = "Mixed"
*5: [1] = "Analog", [2] = "NXDN"
No. Setup item Display Remarks
1 RX Frequency RX Frequency Receive Frequency
2 TX Frequency TX Frequency Transmit Frequency
3 Channel Type Channel Type NXDN:
Analog/NXDN/Mixed
4 Transmit Mode Transmit Mode NXDN: Analog/NXDN
5 RX Signaling RX QT/DQT Receive QT/DQT
6 TX Signaling TX QT/DQT Transmit QT/DQT
7 RX RAN RX RAN None, 1~63
8 TX RAN TX RAN None, 1~63
9 Transmit Power Transmit
Power
Low/Medium/High
10 Channel Name Channel Name
Key
\Item
Zone
Select
Channel Select RX Frequency TX Frequency Channel Type Transmit Mode
*3
RX Signaling
[ ] Decision Decision Decision Decision Decision Decision Decision
[ ] Unused Back to the
previous item
Back to the
previous item
Back to the
previous item
Back to the
previous item
Back to the
previous item
Back to the
previous item
[ ] Unused Unused Unused TX Frequency
OFF
Unused Unused Unused
[ ] Exit panel
program
mode
Exit panel
program mode
Exit panel
program mode
Exit panel
program mode
Exit panel
program mode
Exit panel
program mode
Exit panel
program mode
[] Zone
change
Channel change Frequency up Frequency up Channel type
change
Transmit Mode
change
Signaling
number change
[] Zone
change
Channel change Frequency down Frequency down Channel type
change
Transmit Mode
change
Signaling
number change
[] Unused Unused Frequency step
change
Frequency step
change
Unused Unused Signaling type
change
[] Unused Unused Frequency step
change
Frequency step
change
Unused Unused Signaling type
change
MIC
Keypad
[0] ~ [9]
Zone
number
select
Channel number
select
Entry a Frequency directly Channel type
select ([1], [2] or
[3]) *4
Transmit Mode
select ([1] or [2])
*5
Entry a
Frequency
directly
MIC
Keypad [*]
Decision Decision Decision Decision Decision Decision Decision
MIC
Keypad [#]
Unused Back to the
previous item
Back to the
previous item
Back to the
previous item
Back to the
previous item
Back to the
previous item
Back to the
previous item

(No.RA075<Rev.001>)1-9
 Key operation (2/3)
*6: [1] = "Low", [2] = "Medium", [3] = "High"
 Key operation (3/3)
Key
\Item
TX Signaling RX RAN TX RAN Transmit
Power
[ ] Decision Decision Decision Decision
[ ] Back to the previous item Back to the previous item Back to the previous item Back to the previous item
[ ] Unused Unused Unused Unused
[ ] Exit panel program mode Exit panel program mode Exit panel program mode Exit panel program mode
[] Signaling number change RX RAN up TX RAN up Transmit power change
[] Signaling number change RX RAN down TX RAN down Transmit power change
[] Signaling type change RX RAN ON/OFF TX RAN ON/OFF Unused
[] Signaling type change RX RAN ON/OFF TX RAN ON/OFF Unused
MIC Keypad
[0] ~ [9]
Entry a Frequency directly Entry a code directly Transmit power select ([1],
[2] or [3]) *6
MIC
Keypad [*]
Decision Decision Decision Decision
MIC
Keypad [#]
Back to the previous item Back to the previous item Back to the previous item Back to the previous item
Key\Item Channel Name
[ ] Decision and exit the “Manual Entry mode”
[ ] Back to the previous item
[ ] Change the character type (Capital font → Small font → Numerical value)
[ ] Delete
[] Character selection ("A", "a" or "0" to "Z", "z" or "9" )
[] Character selection ("Z", "z" or " 9" to "A", "a" or "0")
[] Move a cursor to the right
[] Move a cursor to the left
MIC Keypad
[0] ~ [9]
Character selection (Follow to the "Keypad Character Entry" in the FPU setting)
MIC Keypad [*] Change the character type (Capital font → Small font → Numerical value)
MIC Keypad [#] Delete

1-10 (No.RA075<Rev.001>)
•Front panel programming mode flow chart
Medium
Blank Channel
there is more than two.
Analog
DQT IDQT NQT
OFF
[Channel Type]: "Analog"
[TX Frequency]: "OFF"
[Channel Type]: "Analog"
Clone/Front Panel Password
[ ]
[ ]
[ ] or [ ]
[No]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ] or [ ]
Mixed
[ ] or [ ]
[ ] or [ ] [ ] or [ ] [ ] or [ ]
[ ] or [ ] [ ] or [ ] [ ] or [ ]
Enter the Front panel programming mode
by using section "2.2.2 How to Enter Each Mode".
[ ]
[ ] or [ ]
Transmit Mode select NXDN
DQT IDQT NQT
OFF
Channel Type
NXDN
[ ] or [ ]
OFF
Zone Select
Keep This Change?
Channel Name Channel Select
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
Zone-Channel Format
is “Personality”.
[No]
NXDN
OFF
[ ] or [ ]
RAN
OFF
[ ] or [ ]
RAN
[Channel Type]: "Analog","Mixed"(Transmit Mode: NXDN)
[TX Frequency]: Other than "OFF"
[Channel Type]: "Analog","Mixed"(Transmit Mode: NXDN)
High
[ ] or [ ]
Analog
[ ] or [ ]
[ ]
Analog
[ ]
[TX Frequency]: "OFF"
[Channel Type]: "NXDN"
[ ]
[Channel Type]: "NXDN"
"Mixed"(Transmit Mode: NXDN)
[ ]
Note: Zone-Channel Format allows you to whether to configure for each zone the channels in the same system, or channels in different system.
[TX Frequency]: Other than "OFF"
[Channel Type]: "NXDN","Mixed"(Transmit Mode: NXDN)
RX Signaling
TX Signaling
RX RAN
TX RAN
"Mixed"
(Transmit Mode: NXDN)
Input Password
Front panel Programming mode
Low
Transmit Power
Select the setting channel.
"System Type = Conventional"
System Select
RX Frequency
TX Frequency
[System Type]: "NXDN"
[Channel Type]: "Mixed"
[System Type]: "NXDN"
[System Type]: "NXDN"

(No.RA075<Rev.001>)1-11
2.3 INSTALLATION
External View
MODEL NAME PLATE
DEPTH OF
EFFECTIVE
THREAD:8
121.6 66 45.5
4
3-M x0.7
DC CONNECTOR
WITH CABLE
ANTENNA
CONNECTOR
(M TYPE)
DEPTH OF
EFFECTIVE
THREAD:10 33
28.8
4
2-M x0.7
CAUTION LABEL
(FCC)
CAUTION LABEL
(HOT SURFACE)
KCT-71
CONNECTION
DEPTH OF
EFFECTIVE
THREAD:8
SMA CONNECTOR (GPS)
ACC.CONNECTOR
(MOLEX 9P)
WITH CABLE
D-SUB CONNECTOR (25P)
MICRO USB CONNECTOR
WITH CABLE
121.6 66 45.5
65
336.5
351.5
177
178
4
3-M x0.7

1-12 (No.RA075<Rev.001>)
2.3.1 Installation for the remote control system
The KCH-19, KCH-20R REMOTE CONTROL HEAD, and KCH-21R HANDHELD CONTROL HEAD can be connected to the
NX-5600HB with the KCT-71 or KCT-77 REMOTE CONTROL CABLE.
The figure below shows the configuration of the control head system and the setting of the DIP switch. The DIP switch settings are
very important for the proper operation of a Multi Control Head system. The DIP switches are used for number management of the
Control Heads in the system; they also determine termination for CAN (Controller Area Network) communications.
REMOTE CONTROL HEAD configuration and DIP switch setting
HANDHELD CONTROL HEAD configuration and DIP switch setting
Note:
For the multi RF Deck system, refer to the KRK-14H/KRK-15B service manual (B5B-7173-20).
Because the NX-5600HB has the function of the KRK-15B, it can be connected directly to the REMOTE CONTROL HEAD.
The KRK-14H interface kit is required to connect the KCH-19 and radio. Refer to the KRK-14H/KRK-15B service manual (B5B-
7173-20).
NX-5600HB
KCH-20R
KCT-71
REMOTE
CONTROL HEAD
(SW1-SW4: ON)
(SW1-SW4: ON)
1 2 3 4
ON
1 2 3 4
ON
1 2 3 4
ON
Dual Head systemSingle Head system
NX-5600HB
KCH-20R
1
KCH-20R
2
KCT-71 KCT-71
REMOTE
CONTROL HEAD 1 REMOTE CONTROL HEAD 2
(SW1: OFF, SW2-SW4: ON)
(SW1-SW4: ON) (SW1-SW3: ON, SW4: OFF)
1 2 3 4
ON
1 2 3 4
ON
KCT-77
NX-5600HB
KCH-21R
HANDHELD CONTROL HEAD
Single Head system
(SW1-SW4: ON)
HANDHELD CONTROL HEAD 2
HANDHELD CONTROL HEAD 1
KCT-77 KCT-77
NX-5600HB
KCH-21R
1
KCH-21R
2
Dual Head system
(SW1: OFF, SW2-SW4: ON)
(SW: ON) (SW: ON) (SW: OFF)
ONONON
1 2 3 4
ON
1 2 3 4
ON

(No.RA075<Rev.001>)1-13
2.3.1.1 Connecting procedure of the REMOTE CONTROL
CABLE for Single Head system
(The procedure for connecting the KCT-71 to the radio and the
procedure for connecting the KCT-77 to the radio are the same.)
(1) Insert the connector of the KCT-71 into the connector of the
radio.
(Even if the connector of the KCT-71 is inserted into either
of the 2 connectors of the radio, the conditions are the
same, there is no influence on the operation.)
(2) Fit the waterproof packing to the chassis, then press it in
the direction of the arrow and flatten its surface.
(3) Form the cable of the KCT-71 so as not to protrude from
the groove of the chassis as shown below.
(4) Attach the MOLDING COVER of the radio accessory to the
chassis, and tighten the 2 screws.
(5) Attach the other side of the KCT-71 or KCT-77 to the KCH-
20R REMOTE CONTROL HEAD, KCH-21R HANDHELD
CONTROL HEAD.
For the installation method, refer to the service manuals of
the KCH-20R or KCH-21R.
DIP switch
Waterproof packing
MOLDING COVER
Screw

1-14 (No.RA075<Rev.001>)
2.3.1.2 Connecting procedure of the REMOTE CONTROL
CABLE for Dual Head system
(The procedure for connecting the KCT-71 to the radio and the
procedure for connecting the KCT-77 to the radio are the same.)
(1) Cut the waterproof packing of the KCT-71 along the dotted
line with a cutting tool so as to make the hole for the
passage of another KCT-71 connector wire.
(2) Push out the connector from the hole of another KCT-71
waterproof packing.
(3) Combine the modified KCT-71 of step (1) and KCT-71 of
step (2).
Plug the connector of the KCT-71 of step (2) into the hole
of the KCT-71 waterproof packing of step (1).
(4) Insert each of the 2 connectors of the KCT-71 made in step
(3) into the connectors of the radio.
(5) Fit the waterproof packing to the chassis, then press it in
the direction of the arrow and flatten its surface.
(6) Form the cable of the modified KCT-71 so as not to
protrude from the groove of the chassis as shown below.
Waterproof packing Cut point
DIP switch
Waterproof packing

(No.RA075<Rev.001>)1-15
(7) Attach the MOLDING COVER of the radio accessory to the
chassis, and tighten the 2 screws.
(8) Attach the other side of the KCT-71 or KCT-77 to the KCH-
20R REMOTE CONTROL HEAD, KCH-21R HANDHELD
CONTROL HEAD.
For the installation method, refer to the service manuals of
the KCH-20R or KCH-21R.
2.3.2 Ignition Sense Cable (KCT-18: Option)
The KCT-18 is an optional cable to use the following functions:
Ignition function
The ignition function allows you to turn the radio's power on and
off with the ignition key of your car.
2.3.2.1 Connecting the KCT-18 cable to the radio
(1) Insert the KCT-18 lead terminal into pin 1 (IGN) of the
Socket (9-pin) NX-5600HB accessory.
(2) Connect the socket (9-pin) to the connector (9-pin) for
accessory on the front of the radio.
2.3.2.2 Connecting the KCT-18 cable to the
KCH-20R Remote Control Head
When connecting the KCT-18 to the KCH-20R, the KCT-72
connection cable is used.
(1) To connect the KCT-72 to the KCH-20R, modify (cut) the
waterproof packing of the KCT-71 (KCH-20R side). The
cutting position and procedure of the KCT-71 waterproof
packing are the same as "2.3.1.2 Connecting procedure of
the REMOTE CONTROL CABLE for Dual Head system".
Refer to the "2.3.1.2 Connecting procedure of the
REMOTE CONTROL CABLE for Dual Head system".
(2) Combine the modified KCT-71 and KCT-72.
Plug the connector of the KCT-72 into the hole of the
modified KCT-71waterproof packing.
(3) Insert each of the 2 connectors of the KCT-71 and KCT-72
made in step (2) into the KCH-20R.
(4) Insert the KCT-18 lead terminal into pin 1 (IGN) of the
socket (12-pin) KCT-72 accessory.
(5) Connect the socket (12-pin) made in step(4) of the KCT-18
to the KCT-72 of the control head.
Screw
MOLDING COVER
1
7
9
3KCT-18
Socket (9-pin) NX-5600HB accessory
KCT-72 connector
Modified KCT-71
Note: Flatten swelling of the
waterproof packing.
Slide and lock
Socket (12-pin) KCT-72 accessory
KCT-18

1-16 (No.RA075<Rev.001>)
2.3.3 External Speaker (KES-5/KES-5A: Option)
The speaker output is as follows:
(1) The external speaker output from the connector (9-pin) for
accessory on the front of the NX-5600HB is 12 W / 4 ohm.
(2) The KCH-20R Remote Control Head does not have a built-
in speaker. By connecting the KCT-72 to KCH-20R, an
external speaker can be connected. When using the KCT-
72, the speaker output from the KCH-20R is 3 W / 4 ohm.
Note:
Since the radio uses a BTL audio amplifier, do not ground
the speaker output pin.
2.3.3.1 Connecting the KES-5/5A to the accessory
connector (9-pin) of the NX-5600HB
(1) Connect the speaker lead of KES-5/5A to the Socket (9-
pin) NX-5600HB accessory.
Insert the black and white stripe speaker lead into hole pin
2 of the socket (9-pin), and black lead into hole pin 6 of the
socket.
(2) Connect the socket of KES-5/5A made in step (1) to the
connector (9-pin) for accessory on the front of the NX-
5600HB.
2.3.3.2 Connecting the KES-5/5A to the KCH-20R
When connecting the KES-5/5A to the KCH-20R, the KCT-72
connection cable is used.
(1) Connecting the KCT-72 to the KCH-20R is same as
"2.3.2.2 Connecting the KCT-18 cable to the KCH-20R
Remote Control Head". Refer to the "2.3.2.2 Connecting
the KCT-18 cable to the KCH-20R Remote Control Head".
(2) Connect the speaker lead of KES-5/5A to the socket (12-
pin) KCT-72 accessory.
Insert the Black/White lead into hole pin 10 of the socket
(12-pin), and the Black lead into hole pin 11 of the socket.
(3) Connect the socket of KES-5/5A made in step (2) to the
accessory connector (12-pin) of the KCT-72.
2.3.3.3 Use as public address speaker
The 20W PA (Public Address) voice signal is output from pins 7
and 8.
(1) Connect the lead wire of the KES-5/5A to the Socket (9-
pin) NX-5600HB accessory.
Insert the black and white stripe lead into hole pin 7 of the
socket, and the black lead into hole pin 8 of the socket.
2.3.4 Horn Alert Function
Installation procedure for the Horn alert function (maximum 2A
drive).
Connect the car horn warning control signal with the 4 pin and 5
pin of the Socket (9-pin) NX-5600HB accessory.
The Horn alert function is turned on / off by the FET switch circuit
inside the radio.
Horn alert function can be controlled by signaling decoding.
This switch is the FET switch of P-channel type.
Therefore, a DC power supply is necessary to use the HR1.
The voltage range is from 5V to 16V. The maximum current is
2A.
Pay attention to the input and output of the Socket (9-pin) NX-
5600HB accessory.
1
7
6
2
9
Black/White lead
KES-5/5A speaker lead
Black lead
Socket (9-pin) NX-5600HB accessory
Socket (12-pin) KCT-72 accessory
Black lead
KES-5/5A speaker lead
Black/White lead
10
11
13
7
8
KES-5/5A speaker lead
Black lead
Black/White lead
Socket (9-pin) NX-5600HB accessory
1
7
9
horn warning control signal
horn warning control signal
Socket (9-pin) NX-5600HB accessory
h
5
4
5
4. HR1
5. HR2
More
than 8ohm
SB (D-Sub 25pin connector)
9. GND
4. HR1
5. HR2
More
than 8ohm
SB (D-Sub 25pin connector)
9. GND
4. HR1
5. HR2
9. GND
(Default)

(No.RA075<Rev.001>)1-17
2.3.5 SECURE CRYPTOGRAPHIC MODULE (KWD-AE30/KWD-AE31:Option)
2.3.5.1 SUPPLIED ACCESSORIES
Note:
Supplied accessories with * mark are not used for the NX-5600HB.
2.3.5.2 INSTALLING THE MODULE IN THE TRANSCEIVER
(1) Remove the M.CABINET and RUBBER SEAL of the
transceiver.
(2) Attach the cushion B and C to the module backside.
Note:
Refer to the figure for how to attach cushion B. If the
release paper is reversed, it cannot be pulled out.
(3) Fold the release paper as indicated in the figure.
(4) Insert the connector of the module into the CN5 of the Main
unit.
(5) Pull and remove the release paper while pressing down on
the module with your finger to hold it in place, to attach the
module to the Main unit.
Note:
• When it is necessary to remove the module, do so by
peeling the module off using your finger, while pulling
it vertically. Do not use a screwdriver or other similar
implement to remove the module; you may
inadvertently damage the Main unit and the module.
• Cushion B cannot be reused. Attach a new cushion B
when you remove the cushion from the module.
Connecting cable *
(X42-3330-XX)
Cushion A *
(G13-2179-XX)
Cushion B
(G13-2178-XX)
Cushion C
(G1D-0006-XX)
Cushion D *
(G1D-0055-XX)
Spacer *
(F3K-0004-XX)
M.CABINET
RUBBER SEAL
Align and attach the
cushion to the side of the
Module.
CN5

1-18 (No.RA075<Rev.001>)
(6) Reinstall the M.CABINET and RUBBER SEAL of the
transceiver.
Note:
• When the KWD-AE30/ KWD-AE31 is installed, select
the “Secure Cryptographic Module” checkbox in the
Product Information of the Programming software
[FPU (Field Programming Unit)], and then set each
parameter.
• If the KWD-AE30/ KWD-AE31 connector is not
properly installed, the TX/RX indicator will blink red or
"No SCM" will appear on the display when the
transceiver power is turned on.
• If the Encryption Key data is not written at the
Keyloader, or the Encryption Key data is zeroized,
"Key Fail" will appear on the display.
• If the KWD-AE30/ KWD-AE31 is installed in other
transceivers, the Encryption Key data will be forced to
zeroize.
2.3.6 Changing D-SUB 25-pin connector (4 pin, 5 pin)
configuration
2.3.6.1 Change configuration of D-SUB 25-pin connector
from AUXIO9 to CTS
4 pin
The output (4 pin) of D-SUB 25-pin connector is configured at
the AUXIO9 as the default value.
Remove the R950 chip jumpers and solder the chip jumpers to
$R953.
2.3.6.2 Change configuration of D-SUB 25-pin connector
from DI to RTS
5 pin
The input (5 pin) of D-SUB 25-pin connector is configured at
the DI as the default value.
Remove the R943 chip jumpers and solder the chip jumpers to
$R946.
MAIN UNIT Component side
Ref. No. Function
R950 $R953 Default AUXIO9
$R950 R953 - CTS (RS-232C)
Ref. No. Function
R943 $R946 Default DI
$R943 R946 - RTS (RS-232C)

(No.RA075<Rev.001>)1-19
2.4 CIRCUIT DESCRIPTION
2.4.1 Overview
The NX-5600HB is a Low Band Analog FM & Digital Mobile transceiver designed to operate in the frequency range of 39 to 50MHz.
The unit consists of a receiver, a transmitter, a phase-locked loop (PLL) frequency synthesizer, a digital control unit, and a power
supply circuit.
2.4.2 Frequency Configuration
The receiver is a double-conversion super-heterodyne using first intermediate frequency (IF) of 10.70MHz and second IF of 2.10MHz.
Incoming signals from the antenna are mixed with the local signal from the VCO/PLL circuit to produce the first IF of 10.70MHz. This
is then mixed with the 12.80MHz second local oscillator output to produce the 2.10MHz second IF. The transmit signal frequency is
generated by the PLL and the VCO-B, and modulated by the signal from the Baseband Circuit. It is then amplified and fed to the
antenna.
Fig.1 Frequency configuration
2.4.3 Receiver System
2.4.3.1 RF Circuit
The receive signal from antenna switch (D306, D307, D308, D309 and D310) is amplified by a RF amplifier (Q505) and passes through
the band-pass filter (L503, L510, L511, L512, L516, L521, L524, L526, L527 and L531) to remove unwanted signals. The signal is
then fed to the 1st mixer (Q502, Q503, Q504 and Q514).
2.4.3.2 IF Circuit
Since there is a noise blanker circuit in the IF circuit section, the IF signal first passes through the delay circuit.
When the noise blanker function is effective, noise is suppressed.
The first IF signal then passed through a four-pole monolithic crystal filter (XF601) to reject adjacent channel signal. The filtered first
IF signal is amplified by the first IF amplifier (Q604 and Q603) and then applied to the IF system IC (IC600). The IF system IC provides
a second mixer, second PLL, AGC and A/D converter.
The second mixer mixes the first IF signal with the 12.80MHz of second local oscillator output and produces the second IF signal of
2.10MHz.
The second IF signal is then be fed into an A/D converter, generates the “I” and “Q” data. This data is in the form of SSI (Serial
Synchronous Interface), and sent to the MPU/DSP (IC706).
2.4.3.3 Audio Amplifier Circuit
Audio processing (high-pass filter, low-pass filter, de-emphasized and so on) at Analog FM mode and decoding at Digital mode are
processed by DSP. SSI signal from DSP is converted to audio signal at CODEC (IC902). The signal goes to connector for external
speaker (CN9) through the amplifier (IC903), electronic volume control (IC719), the amplifier (IC906), Changeover switch (IC912) and
audio amplifier (IC911).
Fig.2 RF and IF circuit
ANT
EXT SP12.80MHz10.70MHz
19.2MHz
230.4~314.4MHz
312~401.6MHzMHz
39~50MHz
28.8〜39.3MHz
49.7〜50.2MHz
XIMts1
MIC
ANT
SW
PA
AMP
RF
AMP
TX
AMP
MCF MIX
IF Circuit
SW
PLLTCXO
VCO-A
VCO-B
1/8
2nd
VCO
Baseband
Circuit
CODEC
AF
AMP
TX/RX: 39~50MHz
ANT D306 Q600
D307,308
Q505
L503,510
L511,512
L516
D309,310
L521,524
L526,527
L531
RF AMP
SSI
IC600IF AMPIF AMPMCF
RX VCO/PLL
IC903 IC719 IC906IC706 IC902
External Speaker
ANT
LPF
ANT
SW BPF BPF BPF
Delay
Circuit
Noise
Blanker
NB
SW IF IC
2nd
VCO
MPU/DSP CODEC
IC911 CN9
VOL
IC912
SW
Q502,503
Q504,514 XF601Q606,607Q608
IF AMP
Q604 Q603

1-20 (No.RA075<Rev.001>)
2.4.4 Transmitter System
2.4.4.1 Audio Band Circuit
Refer to the “LEVEL DIAGRAM” in this manual. The signal from microphone is amplified and converted to digital signal by CODEC
(IC902). IC902 includes AGC function.
Digital signal is transferred to MPU/DSP (IC706) through SSI.
2.4.4.2 Baseband Circuit
Refer to the "LEVEL DIAGRAM" in this manual. The audio signal transferred from CODEC (IC902) is processed at MPU/DSP (IC706).
Voice signals of 300Hz or lower and frequencies of 3kHz or higher are cut off and an audio range 300Hz to 3kHz is extracted. The
audio signal is then pre-emphasized in FM mode and synthesized with the signals, such as CTCSS and DCS, as required, and is
transferred to PLL Frequency Synthesizer block. The DTMF and MDC baseband signals are also generated by MPU/DSP (IC706).
In Digital mode, the audio signal is converted to the 4-Level FSK baseband signal and is transferred to PLL Frequency Synthesizer
block.
The output level according to the transmit carrier is fine-adjusted according to each modulation method.
2.4.4.3 Drive and Final Amplifier
The signal from the TX PLL is amplified by pre-drive amplifier 1 (IC301) and pre-drive amplifier 2 (Q301). The output of the pre-drive
amplifier is amplified by the drive amplifier (Q308) and RF Power amplifier (Q306 and Q307) to 110W (70W when the power is middle
and 25W when the power is low). IC301 is MMIC. Q301, Q306, Q307 and Q308 is MOS FET. The output of the final amplifier is then
passed through the coupler, antenna switch (D306, D307, D308, D309 and D310), harmonic filter (LPF) and applied to the antenna
terminal.
2.4.4.4 APC Circuit
The Automatic transmission power control circuit (APC) controls the transmitter output in adjusted value by monitoring it with a coupler.
RF detection and comparison functions are included in the power-control IC (IC306).
The power control IC output is given as a drive source of the RF power amplifier’s gate (Q306 and Q307), and completes APC
feedback loop.
When a normal antenna load is connected, the Forward RF Power is referenced by the coupler and sent to power-control IC (IC306).
Forward RF Power is converted into DC voltage at IC306 and is compared with the SPC.
The output voltage goes through DC amplifier (IC305 B/2) to pre-drive amplifier 2 (Q301), Drive amplifier (Q308) and RF Power
amplifier (Q306 and Q307).
The voltage controls the gate bias voltage of Q301, Q306, Q307 and Q308, and keeps transmission output stable.
Fig.3 Drive and Final amplifier and APC circuit
D306
D307,308
D309,310
Pre-
Drive1 Drive Amp RF Power Amp ANT
SW LPF
Coupler
PA
CTRL
REV
DET
DC
AMP
DC
AMP
DC
AMP
IC306
SPC
REV
Gate Bias
Gate Bias
Q307
RF Power Amp
Q306
Q308IC301
Pre-
Drive2
Q301
IC305
D304
TX VCO
ANT
IC308
IC305