Kenwood TKR-740 Service Manual

VHF FM REPEATER

TKR-740

SERVICE MANUAL

E VERSION

Panel (Front) (A62-0726-03)

LED (B30-2197-05)

LED (B30-0864-05)

LED ASSY (LA301DB)

LED (B30-2198-05)

B51-8642-00 (S) 272

PUSH KNOB (TEST) (K29-3002-14)

MODULAR JACK (E08-0876-05)

KNOB (VOL) (K29-4539-04)

CONTENTS

GENERAL ................................................................2

SYSTEM SET-UP ....................................................2

INSTALLATION.......................................................3

OPERATING FEATURES ........................................ 4

REALIGNMENT.....................................................13

APPLICATION NOTE ............................................ 15

DISASSEMBLY FOR REPAIR ............................... 24

CIRCUIT DESCRIPTION ........................................ 26

SEMICONDUCTOR DATA .................................... 43

COMPONENTS DESCRIPTION ............................46

PARTS LIST...........................................................48

EXPLODED VIEW..................................................61

PACKING ............................................................... 63

TERMINAL FUNCTION.........................................64

ADJUSTMENT ...................................................... 69

PC BOARD

CONTROL UNIT (X53-3882-71) ......................81

TX UNIT (X56-3072-70) ................................... 91

RX UNIT (X55-3050-11).................................103

SCHEMATIC DIAGRAM......................................109

BLOCK DIAGRAM...............................................121

LEVEL DIAGRAM................................................123

INTERCONNECTION DIAGRAM ........................ 125

KES-4 (EXTERNAL SPEAKER) ...........................127

KPG-46 (PROGRAMMING INTERFACE CABLE) .....

SPECIFICATIONS...............................BACK COVER

128

TKR-740

GENERAL / SYSTEM SET-UP

INTRODUCTION

SCOPE OF THIS MANUAL

This manual is intended for use by experienced technicians familiar with similar types of commercial grade communications equipment. It contains all required service information for the equipment and is current as of the publication date. Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions. These are issued as required.

ORDERING REPLACEMENT PARTS

When ordering replacement parts or equipment information, the full part identification number should be included. This applies to all parts, components, kits, or chassis. If the part number is not known, include the chassis or kit number of which it is a part, and a sufficient description of the required component for proper identification.

PERSONNEL SAFETY

The following precautions are recommended for personnel

safety:

●

DO NOT transmit until you verify that all RF connectors are secure and any open connectors are properly terminated.

●

SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an explosive atmosphere.

●

This equipment should be serviced by a qualified technician only.

SERVICE

This radio is designed for easy servicing. Refer to the schematic diagrams, printed circuit board views, and alignment procedures contained within.

SYSTEM SET-UP

Merchandise

received

Choose the type

of transceiver

External RX Filter

Repeater

programming & setup

External speaker

Delivery

Frequency range (MHz)

158-174 (RX)/146-174 (TX)

Yes

See page 14 A personal computer (IBM PC compatible), programming cable (KPG-46), and programming disk (KPG-47D) are required for programming.

Yes

RX modification See page 3

KES-4

installation

RF power

5W to 25W

TKR-740 E

Type

INSTALLATION

RX MODIFICATION FOR EXTERNAL PRESELECTOR FILTER

This model may be modified to use an external pre-selector

filter.

TKR-740

1 Remove the RX cover panel. 2 Remove the flat clip spring from IC4 and L16 3 Remove the 11 screws from the RX unit and the 10 screws

from the shield case.

4 Remove the jumper (R179) from the reverse side of the RX

unit.

5 Insert an SMB receptacle (E04-0409-05) at CN10. Solder

the 5 leads in place.

screw x10

Foil side view

IC17

R179

(0Ω)

RX UNIT (X55-305)

6 Replace the screws on the RX unit and shield case, and the

flat clip spring on IC4 and L16.

7 Move the RX IN signal cable (from the back panel) from

CN1 to CN10.

8 Connect a tracking generator signal to RX IN, then use a

spectrum analyzer to read the output at CN2 while adjusting L16 for the proper response.

9 Next, adjust IF , squelch , and RSSI. 0 Replace the RX cover panel.

PANEL

RX UNIT

screw x11

screw

screw x14

flat clip spring

IC4

L16

flat clip spring

shield case

RX.IN Signal cable

CN1

SMB Receptacle (E04-0409-05)

CN10

L16

CN2

TKR-740

1. Front Panel

OPERATING FEATURES

q Speaker

qq ww

w REF (reference) indicator

Lights red when using an external reference oscillator. Lights green when using the internal oscillator.

e BUSY indicator

Lights green when receiving. Flashes when receiving data from the KPG-47D or when the receiver PLL is unlocked.

r TX (transmit) indicator

Lights red when transmitting. Flashes when transmitting data to the KPG-47D (during programming) or when the transmit PLL is unlocked.

t POWER indicator

Lights green when DC power is applied to the TKR-740.

y Display

Two 7-segment digits display the channel number or status.

PF 1 Key Default: CH (CH UP)

PF 2 Key Default: MON (MONITOR ON/OFF)

PF 3 Key Default: TAKE OVER (TAKE OVER ON/OFF)

PF 4 Key Default: INTERCOM (INTERCOM ON/OFF)

PF 5 Key Default: TX DISABLE (TX Disable/Enable)

PF 6 Key

u Programmable Function keys

Press these keys to activate their programmable functions.

i TEST switch

Press to transmit an unmodulated signal with no local microphone connected. If an external modulation signal source is connected to the

CONTROL I/O jack, the RF signal is modulated

with this signal source.

o VOLUME control

Turn clockwise until a click sounds, to unmute the volume. Rotate to adjust the volume. Turn counterclockwise fully to mute the volume.

!0!0

!0 MICROPHONE jack

!0!0

Connect a microphone to 8-pin modular jack.

PF1 PF2 PF3

PF4 PF5 PF6

Default: RPT DISABLE (Repeat Disable/Enable)

!0!0

2. Rear Panel

q RX IN jack

Connect an RX antenna or a duplexer to this BNC receptacle.

w TEST/SPKR jack

Test input/output jack. Connect an external speaker to this jack.

e REMT I/O jack

Connect an external remote controller to this jack.

r CONTROL I/O jack

Connect an external programming device or an external repeater controller to this

DB-25 interface port.

t EXT REF IN jack

Connect a high-stability external frequency reference oscillator (10MHz, -10dBm or higher) to this BNC receptacle (optional).

y DC 13.2V jack

Connect a 13.2 V DC power supply to this jack.

u FUSE

Insert a 10 A blade fuse into this fuse holder.

i TX OUT jack

Connect a TX antenna or a duplexer to this BNC receptacle.

OPERATING FEATURES

3. Two 7-segment LED Displays

TKR-740

●

Channel display (1-32): while operating normally in User Mode

●

“PC” displayed while in PC Mode.

●

“PG” displayed while in Firmware Programming Mode 2 decimal points displayed = 115,200 bps 1 decimal point displayed = 57,600 bps No decimal = 38,400 bps

●

“E2” displayed when the channel data is not written.

●

“E3” displayed when PLL is unlocked . Receiver PLL unlocked = flashing BUSY LED. Tansmitter PLL unlocked = flashing TX LED. Internal 19.2MHz reference unlocked = flashing decimal point .

●

“E4” displayed when PTT is attempted on a channel number that has no frequency data programmed.

●

“E1” displayed when FPU data is not written.

●

“SC” displayed while in scan mode when the displayed channel is contained in scan sequence, the right side decimal point is displayed. When the displayed cahnnel is the priority channel, the left side decimal point is displayed.

TKR-740

OPERATING FEATURES

4. Programmable Functions

TKR-740 contains many Programmable Functions tabled below.

Programmable Function Description

Channel 1-32 Directly select Channel 1 to 32, respectively. Channel Down The channel decrements by one. Channel Up The channel increments by one. AUX Out 1-6 Off AUX Out 1 to 6 ports become deactivated, respectively. AUX I/O 1-7 Off AUX I/O 1 to 7 ports become deactivated, respectively. AUX Out 1-6 On AUX Out 1 to 6 ports become activated, respectively. AUX I/O 1-7 On AUX I/O 1 to 7 ports become activated, respectively. AUX Out 1-6 On/Off AUX Out 1 to 6 ports are toggled between its active and inactive states, respectively. AUX I/O 1-7 On/Off AUX I/O 1 to 7 ports are toggled between its active and inactive states, respectively. Repeat Enable Enables repeater operation. Repeat Disable Disables repeater operation. Repeat Disable/Enable Toggles between disabling and enabling repeater operation. TX Enable The transmitter is enabled (normal). TX Disable The transmitter is inhibited. TX Disable/Enable Toggles between transmitter enabled (normal) and transmitter inhibited. Remote TX Enable The Remote PTT is enabled. Remote TX Disable The Remote PTT is disabled. Remote TX Disable/Enable The Remote PTT is toggled between disabled and enabled. Local TX Enable The local mic’s PTT is enabled. Local TX Disable The local mic’s PTT is disabled. Local TX Disable/Enable The local mic’s PTT is toggled between disabled and enabled. Scan Off Inhibits scanning. Scan On Starts scanning. Scan On/Off Scanning is toggled between being enabled or inhibited. Intercom On The Intercom feature is enabled. Intercom Off The Intercom feature is disabled. Intercom On/Off The Intercom feature is toggled between enabled and disabled. Voting Tone Off Inhibits the Voting Pilot Tone. Voting Tone On Enables the Voting Pilot Tone. Voting Tone On/Off Toggles between enabling and inhibiting the Voting Pilot Tone. Take Over Toggles between enabling and disabling remote wireline control. QT/DQT Encode Enable Enables the QT/DQT encode operation. QT/DQT Encode Disable Disables the QT/DQT encode operation. QT/DQT Encode Disable/Enable Toggles between disabling and enabling the QT/DQT decode operation. QT/DQT Decode Enable Enables the QT/DQT decode operation. QT/DQT Decode Disable Disables the QT/DQT decode operation. QT/DQT Decode Disable/Enable Toggles between disabling and enabling the QT/DQT decode operation. Test Tone Off The Test Tone is inhibited. Test Tone On The Test Tone is enabled. Test Tone On/Off Toggles between enabling and inhibiting the Test Tone. Squelch Off The Squelch unmutes. Squelch On The Squelch mutes. Squelch On/Off The receiver’s squelch toggles between muted and unmuted. Squelch Momentary The squelch momentarily unmutes. Monitor Off The QT/DQT decoder is enabled. Monitor On The QT/DQT decoder is disabled. Monitor On/Off The QT/DQT decoder is toggled between enable and disable.

TKR-740

OPERATING FEATURES

Programmable Function Description

Monitor Momentary The QT/DQT decoder is momentarily disabled. CW ID On The CW ID is transmitted. CW Message 1-8 On The CW Message 1 to 8 is transmitted, respectively. TOT Enable The Time Out Timer is enabled. TOT Disable The Time Out Timer is disabled. TOT Disable/Enable The Time Out Time is toggled between enabled and disabled. Hold Time Enable The parameter of Repeat Hold Time is enabled. Hold Time Disable The parameter of Repeat Hold Time is disabled. Hold Time Disable/Enable The parameter of Repeat Hold Time is toggled between disabled and enabled. Scrambler Off Disables an installed optional voice scrambler board. Scrambler On Enables an installed optional voice scrambler board. Scrambler On/Off Toggles between enabling and disabling an installed optional voice scrambler board. Digital Pager PTT Accepts the external paging encoder’s PTT on AUX Input 2. Digital Pager Data Accepts the external paging encoder’s digital signal on AUX Input 3. Reset Resets to default condition set up by FPU. None No function.

●

The following Programmable Functions are output functions used to tell the condition of the TKR-740 to an external device.

●

The output functions can be assigned to only AUX Outputs as follows.

Programmable Function Description

COR(Carrier Operate Relay) This function becomes valid if an RF carrier is present. TOR(Tone Operate Relay) This function becomes valid if an RF carrier and specified QT/DQT are present. TXS(TX Sense) This function becomes valid when the transmitter is keyed. RX Unlock This alarm function becomes valid if the RX PLL circuitry becomes unlocked. TX Unlock This alarm function becomes valid if the TX PLL circuitry become unlocked. Exciter Temperature This alarm function becomes valid if the temperature of transmitter’s exciter

exceeds approximately 203˚F (95˚C) while transmitting.

Power Supply Upper Limit This alarm function becomes valid if the DC power supply voltage exceeds the

preset point. The preset point is selected in the range of 13.9V to 15.9V.

Power Supply Lower Limit This alarm function becomes valid if the DC power supply voltage becomes less

than the preset point. The preset point is selected in the range of 11.7V to 13.8V.

Exciter Power Upper Limit This alarm function becomes valid if the transmitter’s RF Power output exceeds the

preset point in High power range.

Exciter Power Lower Limit This alarm function becomes valid if the transmitter’s RF Power output becomes

less than the preset point in High power range.

RX Signal Detect (Above) This function becomes valid if the receive signal strength exceeds the preset

point. The preset point is selected in the range of -120dBm to -80dBm.

RX Signal Detect (Below) This function becomes valid if the receive signal strength becomes less than the

preset point. The preset point is selected in the range of -120dBm to -80dBm.

Selectable AUX Outputs which are set up as Selectable appear in the available Function List

for the AUX Input Functions and Key Assignment. This allows AUX Inputs and PF Keys to be used to control AUX Outputs.

TKR-740

OPERATING FEATURES

5. Trigger Assignment

The Programmable Functions described above can be assigned to PF Keys, AUX Input, and Start Up according to following table. In the last column of the table, when the Programmable Functions is assigned to any PF Keys, it expresses that the

Trigger

LED in the PF Key turns on either conditions. ‘O’ expresses that the trigger is available the Programmable Function. ‘X’ expresses that the trigger is not available the Programmable Function.

Condition of LED on

Function

Channel 1-32, Up/Down O O O Do not turn on AUX Out 1-6(I/O 1-7) Off X O O AUX Out 1-6(I/O 1-7) On X O O AUX Out 1-6(I/O 1-7) On/Off O O X Turns on in ON status Repeat Enable X O O Repeat Disable X O O Repeat Disable/Enable O O X Turns on in Disable status TX Enable X O O TX Disable X O O TX Disable/Enable O O X Turns on in Disable status Remote TX Enable X O O Remote TX Disable X O O Remote TX Disable/Enable O O X Turns on in Disable status Local TX Enable X O O Local TX Disable X O O Local TX Disable/Enable O O X Turns on in Disable status Scan Off X O O Scan On X O O Scan On/Off O O X Turns on in ON status Intercom On X O O Intercom Off X O O Intercom On/Off O O X Turns on in ON status Voting Off X O O Voting On X O O Voting On/Off O O X Turns on in ON status Take Over O X X Turns on in ON status QT/DQT Encode Enable X O O QT/DQT Encode Disable X O O QT/DQT Encode Disable/Enable O O X Turns on in Disable status QT/DQT Decode Enable X O O QT/DQT Decode Disable X O O QT/DQT Decode Disable/Enable O O X Turns on in Disable status Test Tone Off X O O Test Tone On X O O Test Tone On/Off O O X Turns on in ON status Squelch Off X O O Squelch On X O O Squelch On/Off O O X Turns on in OFF status Squelch Momentary O X X Turns on in OFF status Monitor Off X O O -

PF Keys

Start Up

AUX Input

OPERATING FEATURES

Trigger

TKR-740

Condition of LED on

Function

Monitor On X O O Monitor On/Off O O X Turns on in ON status Monitor Momentary O X X Turns on in ON status CW ID On O O O Turns on while transmitting CW Message 1-8 On O O O Turns on while transmitting TOT Enable X O O TOT Disable X O O TOT Disable/Enable O O X Turns on in Disable status Hold Time Enable X O O Hold Time Disable X O O Hold Time Disable/Enable O O X Turns on in Disable status Scrambler Off X O O Scrambler On X O O Scrambler On/Off O O X Turns on in ON status Reset O O X Do not turn on None O O O Do not turn on

PF Keys

AUX Input

Start Up

TKR-740

OPERATING FEATURES

6. Simplex/Duplex Operation

The Simplex/Duplex function is used to specify whether the channel is used as simplex (receiver muted during transmit) or duplex (receiver unmuted during transmit). The channel has same TX/RX frequency and can operate only in Simplex mode.

7. Repeater/Base Station Operation

The Repeat function is used to specify whether the channel is used as a repeater or as a base station. A repeater simultaneously and automatically re-transmits its received audio; a duplex base station has independent simultaneous transmit and receive paths; a simplex base station are mutually exclusive transmit and receive paths.

8. Signalling Feature

8.1 Multiple QT/DQT

The TKR-740 can function as a multiple-QT/DQT decode/ encode unit for operation as a community repeater or multipleQT/DQT base station. 16 Multi Tables can be created, each Multi Table consisting of 16 decode / encode combinations and can be assigned on a per-channel basis.

The Multi Table function enables the TKR-740 to decode any one of the 16 QT/DQTs pre-programmed into the selected Multi Table. When receiving a signal (repeater operation), the repeater uses the QT/DQT encode which corresponds to the decoded QT/DQT as set in the Multi Table. In the Multi Table, signalling pair of “No.1” (first column) is defined as “Primary”. A receiving signalling (if it is contained within No.1 to No.16) is defined as “Current”.

8.2 Encode Tone in Multiple

When Local mic PTT, Remote PTT or Ext. PTT is active while the repeater is in use or the duplex-base station is receiving, the encode signalling is determined according to Encode Tone in Multiple function. The simplex-base station always transmits the “Primary” encode QT/DQT.

Current : When any PTT as described above is active while the repeater is in use or the duplex-base station is receiving, the “paired” encode QT/DQT associated with receiving QT/ DQT is transmitted. When any PTT is active while the repeater or the duplex-base station is in idle period, the “Primary” encode QT/DQT is transmitted.

Primary : When any PTT (provided that the Priority of any PTT is higher than the Priority of Repeat PTT) is active while the repeater is in use, the encode QT/DQT changes “paired” encode QT/DQT to “Primary” while continuing to transmit. When any PTT is active while the repeater is in idle period, the “Primary” encode QT/DQT is transmitted. In the base station, the “Primary” encode QT/DQT is always transmitted regardless of the receiver status.

sent a reverse QT burst (squelch-tail elimination). This mutes a receiving radio’s speaker audio before its receiver circuit shuts off causes squelch tail noise in the speaker audio. The TKR740 can select the time between 140 to 200 ms that the QT reverse burst is sent. Typically this time should not have to be adjusted from the default value. The transmission of the QT reverse burst can be also inhibited if the QT Reverse Burst function is set to “No”.

8.4 DQT Turn Off Code Time

During repeat with DQT codes, the repeater re-transmits a specific turn-off code when it detects the radio using the repeater has un-keyed and also sent the turn-off code (squelchtail elimination). This mutes a receiving radio’s speaker audio before its receiver circuit shuts off and causes squelch tail noise in the speaker audio. The TKR-740 can select the time between 140 to 200 ms that the DQT turn-off code is sent. Typically this time should not have to be adjusted from the default value.

8.5 Off Hook Decode

The TKR-740 is able to decode QT/DQT regardless whether the local microphone is in the on- or off-hook condition. When the Off Hook Decode function is enabled, the TKR-740 is capable of QT/DQT decode even though the microphone is in the off-hook condition (or a local microphone is not installed).

9. Scan Feature

9.1 Scan Operation

Providing that the TKR-740 contains two or more non-priority ADD channel or one or more non-priority ADD channel and Priority channel, it starts scanning once the Scan On function is executed and displays “SC” on the 7-seg LED. Scanning stops temporarily if any following conditions become valid.

1) if a RF carrier and a valid QT/DQT is present. The receiving

channel number is displayed and the received audio is heard from a speaker.

2) if a RF carrier is present, providing that the Monitor On

function is executed.

3) if the Squelch Off function is executed. Scanning stops on

the channel being scanned when Squelch Off is executed, the channel number is displayed and the received audio is heard from a speaker.

4) if a local microphone’s hook is in off hook status, providing

that the Off Hook Scan function is set to Disable. Scanning stops on the Revert channel, but the audio is not heard until a valid signal is received.

When the received call is ended, scanning automatically resumes after the period set in Dropout Delay Time function has expired. When the Scan Off function is executed, the TKR740 inhibits scanning and displays the selected channel.

8.3 QT Reverse Burst Time

During repeat with QT tones, the repeater re-transmits a phase-shifted burst of the QT tone (“reverse burst”) when it detects the radio using the repeater has un-keyed and also

9.2 Scan Sequence

1) Normal Scan : When no Priority channel is set, scanning of ADD channels is done in ascending order.

2) Single Priority Scan : The Priority channel is set as either a

OPERATING FEATURES

TKR-740

fixed channel or a selected channel. When Priority channel is set, Priority channel and non Priority channel is scanned by turns. When scanning stops on the non Priority channel, calls from the Priority channel is still checked at set intervals while scanning is stopped. This operation is called Look Back and the interval period is selected by the Look Back Time function.

9.3 Revert Channel

The Revert channel is a channel that used to transmit during scanning. The time from the end of transmission on Revert channel to the time scanning automatically resumes is set in Dwell Time function. The Revert channel types are Last Called, Last Used, Selected + Talkback, Priority, Priority plus Talkback, and Selected.

1) Last Called : The TKR-740 reverts to the channel upon which

a call was last received even if scanning has resumed (power on default = selected channel).

2) Last Used (with Talkback) : The TKR-740 reverts to the

channel that was last transmitted on (power on default = selected channel). However, if a call is received on a channel other than the last transmit channel and PTT is pressed before scanning resumes, the transceiver “talks back” on the current receive channel.

3) Selected+Talkback : The TKR-740 reverts to the channel

set by the Channel ‘X’ functions or Channel Select function prior to scan initiation. However, if a call is received on a channel other than the selected channel and PTT is pressed before scanning resumes, the transceiver “talks back” on the current receive channel.

4) Priority : The TKR-740 always reverts to the Priority channel.

5) Priority+Talkback : The TKR-740 always reverts to the Priority

channel. However, if a call is received on a channel other than the Priority channel and PTT is pressed before scanning resumes, the transceiver “talks back” on the current receive channel.

6) Selected : The transceiver reverts to the channel set by the

function prior to scan initiation.

10. CW ID and Message

The TKR-740 contains internal automatic station identifiers. The CW ID (Morse code) is set and transmitted on a perchannel basis. The CW ID is transmitted when the interval period is reached (TX Interval Time function), the channel is changed (CW ID on Channel Change function) or CW ID On function is executed. When CW ID is activated by any functions described above, it is actually sent after the total time of TX Delay Time (not applied to CW ID On function) and CW Modulation Delay Time has expired. TX Delay Time is a period from CW ID is activated to the transmitter is keyed. CW Modulation Delay is a period from the transmitter is keyed to the CW ID tone is sent. The CW ID tone is routed to the Remote Receive Audio (Remote RA) port if the Send CW ID to Remote RA function is set to Yes, consequently the console can monitor the CW ID tone.

The TKR-740 contains 8 message banks for CW Message. CW Message 1 to 8 is transmitted on the current channel when the CW Message 1 to 8 On function is activated, respectively.

11. PTT Priority

A number of keying sources can be used to cause the TKR740 to transmit. The transmit audio path is switched according to their keying souces and when PTTs is simultaneously activated, the transmit audio path related to the PTT with higher priority is given priority. These are Local Mic PTT, External PTT, Remote PTT, Repeat PTT and Digital Pager PTT. However, since Digital Pager PTT is considered lowest of priority, it is not selected in the order of priority.

12. Intercom Operation

The repeater has an Intercom feature which allows wireline communication between the dispatcher at the remote site and the servicing technician at the repeater. To use this feature, Intercom On/Off (mandatory), TX Disable/Enable, Local TX Disable/Enable and Remote TX Disable/Enable functions must be optionally assigned to a PF Key or an Aux Input.

When Intercom On function is executed and a PTT is activated, a intercom operation becomes valid and a transmitter is also keyed. To use the Intercom without keying the transmitter, enable the TX Disable function (PF Key or Aux Input). To use the Intercom with a local mic’s PTT without keying the transmitter, enable the Local TX Disable function. To use the Intercom with the wireline remote site’s PTT without keying the transmitter, enable the Remote TX Disable function.

The audio routing during Intercom operation is determined by the Intercom Remote/Local function.

1) Remote : Audio from the Remote TA port will be heard on

the local speaker while a Remote PTT is pressed, regardless of whether receiver audio is present.

2) Local : Audio from the local Mic will be routed to the

Remote RA port on the rear panel regardless of whether receiver audio is present. This local Mic audio will be heard at the remote.

3) Remote/Local : Audio from the remote and the local Mic

audio will be heard from the local speaker and from the remote respectively, regardless of whether receiver audio is present.

13. Voting Pilot Tone

The TKR-740 contains an internal Voting Pilot Tone Generator to be used with a voting comparator shelf. The Voting Pilot Tone is sent from a remote receiver to a voting comparator during idle periods. This continuous tone is used to confirm that the phone line is intact as well as establish a reference amplitude for the audio which will be present once the remote receiver is unsquelched by a received signal. The Voting Pilot Tone is a single-frequency sine wave and is turned On and Off by toggling Voting Tone On/Off functions. When any Voting Pilot Tone is selected, the selected Voting Pilot Tone is automatically output to RA and Remote RA ports.

TKR-740

OPERATING FEATURES

14. Digital Pager

The TKR-740 can be used as a digital paging transmitter by using the Digital Pager inputs on the rear panel. These inputs accept the logical 0 or 1 (0 V or 5 V) from the external paging encoder, producing a +4.0 kHz carrier shift in response to a 0 and a -4.0 kHz in response to a 1. If Digital Paging Input function is enabled, the TKR-740 accepts the external encoder’s digital signal on AUX In 3 and its PTT on AUX In 2 (active low).

15. Time Out Timer

The Time Out Timer function determines the period of time users can continuously transmit. When the selected period expires, the transmission is inhibited.

16. Repeat Hold Time

The Repeat Hold Timer (hang timer) function is used to prevent the repeater from being repeatedly keyed and unkeyed in response to short message traffic. When a mobile transceiver unkeys, the repeater’s Hold Timer allows the repeater to continue transmitting for a brief period while waiting for a responding end user. If no valid QT/DQT is detected within the Hold Timer period, the transmitter is allowed to unkey. This function determines the period of time that the transmitter is allowed to remain keyed after the loss of a valid QT/DQT received signal.

17. Take Over

Take Over function is used to disable the remote wireline control of the repeater. When Take Over function is enable, the AUX Inputs and outputs, remote audio inputs and outputs, External PTT, External Monitor, Remote PTT and TXD2/RXD2 serial data lines are disabled. All AUX Input functions assigned to any AUX Input remain in current state. However Remote PTT, External PTT and External Monitor become a “Off” state.

18. Test Tone

The Test Tone is a single-frequency audio sine wave and is turned On and Off by toggling Test Tone On/Off functions. The transmitter can be modulated without a local mic by using the test tone. When Test Tone On function is executed and any PTT is activated, the TKR-740 transmits the test tone with mic mute and also routes the test tone to Remote RA port.

The AUX Output port can be set execute a single output function. If the port type for an AUX I/O Ports 1-7 is set for “AUX Output” it will also appear AUX Output window for function programming. The Output logic of AUX Output can be set as either active High or active Low by the Logic Type function. Active High outputs a High (5V) when the programmed condition becomes valid; active Low outputs a Low (0V) when the condition becomes valid.

20. Channel Select

AUX I/O Ports 1-5 (1 or all 5) can each be set for “Channel Select” providing up to 32 channel selection capability. These are 1 to 5 bit Binary Coded Decimal (BCD) inputs. AUX I/O 1 is a least significant bit. When all of AUX I/O ports 1-5 is set to Channel Select, “11111” input (LSB on the right side) signifies the Channel 1 and “11110” input signifies the Channel 2. When the Channel Select function is set to any AUX I/O Ports, The Channel ‘X’ function (Channel Up, Channel Down, Channel 1, etc.) can not be set to the AUX Input ports, but can be set to the PF Keys. Normally the channel control is controlled by the Channel Select function. If the Take Over function is executed, the channel control is disabled to be controlled by the Channel Select and enabled to be controlled by the PF Keys.

21. Start Up

When the TKR-740 is first turned on or is reset, up to 3 functions pre-programmed into the Start Up function are executed in sequence.

22. Optional Board

The TKR-740 can be installed as a optional scrambler board. Scrambler codes between 1 and 16 are available per channel. If the scrambler board is not to be used (although it is installed), set the parameter to “Off”. When any Scrambler code is set up and Scrambler On function is executed, the scrambler board is activated.

19. AUX Input and Output

There are 7 programmable AUX I/O Ports 1-7(pins 6-12) on the rear 12 pin REMT I/O connector and 3 programmable AUX Input Ports 1-3 (pins 4-6) and 6 programmable AUX Output ports (pins 20-25) on the rear 25 pin D-Sub connector. The 7 programmable AUX I/O pins are primarily intended for remote control interfaces. Each AUX I/O Port can be set for AUX Input, AUX Output or remote Channel Select types.

The AUX Input port can be set execute a single input function or a set of up to three functions when the port is activated. If the port type for an AUX I/O Ports 1-7 is set for “AUX Input”, it will also appear AUX Input window for function programming. The input logic is fixed as active low.

1. Modes

TKR-740

REALIGNMENT

User Mode

PC Mode

Firmware Programming Mode

Mode

User Mode PC Mode PC Programming Mode PC Test Mode

PC Tuning Mode

Firmware Programming Mode

PC Programming Mode

PC Test Mode PC Tuning Mode

Function

Use this mode for normal operation. Use this mode to make various settings by means of the FPU through the RS-232C port. Use to read and write frequency data and other features to and from the Repeater. Use to check the Repeater using the PC. This feature is included in the FPU. Use to tune the Repeater using the PC. This feature is included in the FPU. Use when changing the Firmware program of the flash memory.

2. How to Enter Each Mode

Mode

User Mode PC Mode Firmware Programming Mode

Power ON. Received commands from PC. [PF1] key + Power ON (one second).

Operation

TKR-740

REALIGNMENT

3. PC Mode

3-1. Preface

The TKR-740 repeater is programmed by using a personal computer, programming interface and KPG-47D software. (Version 2.00 or later)

3-2. Connection procedure

1. Connect the TKR-740 to the personal computer with the

interface cable.

2. When power is applied, the user mode is entered immediately.

When the PC sends a command, the repeater enters the PC mode and displays “PC” on the 7-segment LED. When data is being transmitted to the PC from the repeater, the TX LED flashes. The BUSY LED flashes when data from the PC is being received by the repeater.

Notes:

●

The data stored in the personal computer must match the model type, when it is written into the flash memory.

●

Change the TKR-740 to PC mode, then attach the interface cable.

3-3.

KPG-46 description (PC programming interface cable : Option)

The KPG-46 is required to interface the TKR-740 to the computer. It has a circuit in its D-subconnector (25-pin) case that converts the RS-232C logic level to the TTL level. The KPG-46 connects the MICROPHONE connector of the TKR-740 to the computer’s RS-232C serial port.

3-4. Programming software description

The KPG-47D programming disk is supplied in 3-1/2" disk format. The software on the disk allows a user to program TKR-740 repeater via the programming interface cable (KPG-46).

3-5. Programming with IBM PC

Data can be programmed into the flash memory in RS232C format via the MICROPHONE connector.

Note:

Select a frequency band [2.158-174MHz] in the band select menu of FPU.

4. Firmware Programming Mode

4-1. Preface

The TKR-740 uses flash memory to allow it to be easily upgraded when new features are released in the future.

4-2. Connection procedure

Connect the TKR-740 to the personal computer (IBM PC or compatible) with the interface cable (KPG-

46).(Connection is the same as in the PC Mode.)

Note:

You can only program firmware from the 8-pin microphone connector on the front panel. Using the 25-pin logic interface on the rear panel will not work.

4-3. Programming

1. Start up the programming software (KPG-47D), select “firmware program” in the “Program” item, and press the Return key on the personal computer. This starts up the firmware programmer.

2. The top screen is displayed. Press any key to advance to the next screen.

3. Set the communications speed (normally, 115200 bps) and communications port in the Setup item.

4. Set the firmware to be updated by File select (=F1).

5. Turn the TKR-740 power ON with the [PF 1] key held down. Hold the key down for one second until the 7segment display changes to “P.G”. When “P.G.” appears, release your finger from the key.

6. Check the connection between the TKR-740 and the personal computer, and make sure that the TKR-740 is in the Program Mode.

7. Press F10 on the personal computer. A window opens on the display to indicate progress of writing.

8. If writing ends successfully, the TX LED on the TKR-740 lights.

9. If you want to continue programming other TKR-740s, repeat steps 3 to 6.

Notes:

●

To start the Firmware Programmer from KPG-47D, the Fpro path must be set up by KPG-47D Setup.

●

This mode cannot entered if the Firmware Program mode is set to Disable in the Programming software (KPG-47D).

(Ver 2.00 or later)

4-4. Function

If you press the [PF 1] key (front panel), both decimal point on the 7-segment display will disappear. The writing speed is 38400 bps (low-speed mode). If you press the [PF 1] key again, the right hand decimal points will light. The writing speed is 57600 bps (middle-speed mode).

Note:

Normally, write in the high-speed mode (115200 bps).

Fig.1

TKR-740

1 2 3 4 5 6 7 8

APPLICATION NOTE

1. External I/O Connector Description

1.1. MICROPHONE jack

Connector No. Terminal Name Description

1NC No Connection 2+B Power Source; 13.2V / 0.75A maximum 3 GND GND *1 4 PTT (PC serial data from radio) PC Read/Write, PC Tuning, Firmware programming 5 MIG MIC Ground *1

MICROPHONE

Notes:

*1 Pin 5 (MIG) is used for MIC audio ground only. Electrical

grounds such as PTT current return must use Pin 3 (GND).

1.2. TEST/SPKR jack

Connector No. Terminal Name Description I/O Level

TEST / SPKR

6 MIC MIC input (600Ω)*1 7 HOOK (PC serial data to radio) PC Read/Write, PC Tuning, Firmware programming 8NC No Connection

MICROPHONE jack (Viewed from Front Panel)

1 B+(AUX) Un-switched B+ 1A maximum *1 O 13.2V 2 B+(AUX) Un-switched B+ 1A maximum *1 O 13.2V 3NC No Connection 4 GND GND 5 GND GND 6 SPG (Speaker Ground) GND *2 7 RD (RX Data output) RX Detector audio output (non-squelched) O 80mV

(Receive @1kHz Modulation, 60% Deviation) 8 RSSI RSSI voltage check (See Reference Table) O 0 to 5V 9 SPI (Internal Speaker Input) Internal Speaker Input *2 I

10 TXCV TX VCO lock voltage check (See Reference Table) O 1.0 to 4.5V 11 RXCV RX VCO lock voltage check (See Reference Table) O 1.0 to 4.5V 12 SPO External Speaker Output (4W/4Ω)*2O 13 VC Voltage check of Power Source (Impedance: 10kΩ)O 13.2V 14 FWD 15 EXT REF External reference check (INT; 5V EXT; 0V) O 0 or 5V

Voltage check of Forward power (See Reference Table)

O0 to 5V

Notes:

*1 This source can be used to power external equipment to

*2 Connect SPI and SPO by using the 15pin I/O plug when

a maximum 1A on each line (max 2A total). Use is prohibited with the fuse beyond 6A strictly.

using the internal speaker. (INT-SP: 0.25W/32Ω) When using an external speaker, remove the jumper lead from the connector and attach the speaker cable to SPO (pin 12) and SPG (pin 6).

1 2 3 4 5 6

7 8 9 10 11 12 13 14 15

TEST / SPKR jack

(Viewed from Back Panel)

VOLTAGE REFERENCE TABLE (approximate +VDC)

TKR-740E

RSSI (@ -100dBm) 2.5V FWD 2.7V @ 25W

0.6V @ 5W

1.4V @ 136.0MHz

TXCV

RXCV

4.5V @ 154.9MHz

1.8V @ 155.0MHz

4.5V @ 174.0MHz

1.8V @ 147.0MHz

4.5V @ 153.9MHz

1.8V @ 154.0MHz

4.5V @ 162.0MHz

TKR-740

APPLICATION NOTE

1.3. CONTROL I/O jack

Connector No. Terminal Name Description I/O Level

1NC No Connection 2 RXD2 (PC serial data to radio) PC Read/Write, PC Tuning, Remote *1 I RS-232C Level 3 TXD2 (PC serial data from radio) PC Read/Write, PC Tuning, Remote *1 O RS-232C Level 4 AUXI 1 Programmable Function input 1 *2 I 0 or 5V 5 AUXI 2 Programmable Function input 2 *2 I 0 or 5V 6 AUXI 3 Programmable Function input 3 *2 I 0 or 5V 7 DG (Digital Ground) GND (for Digital ground only) 8 TD (TX Data input) TX Signalling data input *3 I 0.5Vpp

9 TA (TX Audio input) TX Audio input *3 I 140mVrms 10 RD (RX Data output) RX Signalling data output *3 O 80mVrms 11 RA (RX Audio output) RX Audio output *3 O 400mVrms 12 RXG (RX Ground) GND (for RA, RD ground only) 13 SPM (Speaker Mute) Mute input; “Mute: Low” I0 or 5V 14 NC No Connection

CONTROL I/O

15 EXT MON (Monitor SW) External Monitor input; “Active: Low”*5 I 0 or 5V 16 EXT PTT (Same as Test SW) External PTT input “ON: 0V OFF: 5V” *3 I 0 or 5V 17 SC (Squelch Control) Squelch status output; “Busy: Low” O0 or 5V 18 NC No Connection 19 TXG (TX Ground) GND (for TA,TD ground only) *3 20 AUXO 1 Programmable Function output 1 *4 O 0 or 5V 21 AUXO 2 Programmable Function output 2 *4 O 0 or 5V 22 AUXO 3 Programmable Function output 3 *4 O 0 or 5V 23 AUXO 4 Programmable Function output 4 *4 O 0 or 5V 24 AUXO 5 Programmable Function output 5 *4 O 0 or 5V 25 AUXO 6 Programmable Function output 6 *4 O 0 or 5V

13 12 11 10 9 8 7 6 5 4 3 2 1

25 24 23 22 21 20 19 18 17 16 15 14

CONTROL I/O (25pin D-SUB) jack

(Viewed from Back Panel)

Notes:

*1Serial data communications with a PC can be done through

either front panel 8-pin modular microphone jack or the rear panel 25-pin D-SUB interface connector. Firmware can only be written through the 8-pin modular microphone jack.

Mode 8pin Modular 25pin D-sub

FPU Read/Write Yes Yes FPU Tuning mode Yes Yes Firmware programming Serial Remote No Yes Real time Monitor No Yes

Yes No

Serial Data transmission method

●

Full duplex communication

●

Asynchronous system (start-stop asynchronous)

●

Non-parity check

●

Start bit: 1bit, Stop bit: 2bit

●

Data: 8bit, LSB output

●

Baud rate: 9600bps

●

Hardware flow control line not used

All AUX I terminals (Section 1.3, 1.4), including any AUX I/O programmed as “AUX Input” with the KGP-47D are ActiveLow logic.

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