Kenwood 144, 440 MHz TH-D7A Troubleshooting, Problem Probable Cause Corrective Action

Page 98

TROUBLESHOOTING

1The problems described in this table are commonly encountered operational malfunctions and are usually not caused

2

by circuit failure.

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

Problem

Probable Cause

 

Corrective Action

Ref. Page

 

4

 

 

 

 

 

Nothing appears on the

1 Low supply voltage

1 Recharge the battery pack or replace

2, 4

 

5

display when the

 

 

the batteries.

 

 

6

transceiver is switched

2 If using the optional DC cable:

2

 

 

 

7

ON, or the display is

a) Bad power cable or connections

 

a) Check the power cable and

 

 

blinking ON and OFF.

 

5

 

8

 

 

 

connections, then correct/replace

 

 

 

 

 

as necessary.

 

 

9

 

 

 

 

 

 

b) Open (blown) power supply fuse

 

b) Investigate the cause for the

—

 

 

 

 

 

10

 

 

 

open fuse. Replace the fuse.

 

 

 

 

 

 

 

 

 

11

Most keys and the

1 Transceiver Lock is ON (Key icon is

1

Press [F] (1 s) to switch OFF

50

 

12

Tuning control do not

visible).

 

Transceiver Lock.

 

 

function.

2 The transceiver is in Channel

2

Press [A/B]+ POWER ON to exit

31

 

13

 

 

Display mode.

 

Channel Display mode.

 

 

14

 

 

 

 

 

3 Tone Alert is ON (Bell icon is

3 Press [F], [ENT] to switch OFF Tone

47

 

15

 

visible).

 

Alert.

 

 

16

 

4 Packet data was being transmitted

4 Operate the keys or the Tuning

—

 

 

using the data band.

 

control after transmitting of packet

 

 

17

 

 

 

 

 

 

 

data is completed.

 

 

 

 

 

 

 

 

18

You cannot select the

The current frequency step size does

Select the appropriate frequency step

46

 

19

exact desired frequency

not allow the frequency to be selected.

size.

 

 

20

using the [UP]/ [DWN]

 

 

 

 

 

or Tuning control.

 

 

 

 

 

21

 

 

 

 

 

You cannot recall any

You have stored no data in any of the

Store the desired frequencies in

27

 

22

memory channels.

memory channels using the current

memory channels using the current

 

 

23

 

band.

band.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90

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Contents TH-D7A Models Covered by this Manual FeaturesThank YOU Precautions One or more of the following statements may be applicableContents Functions ScanSystem Ctcss Microphone ControlMaintenance Wireless Remote Control TH-D7A onlySKY Command 2 TH-D7A only Optional AccessoriesConventions Followed in this Manual Supplied AccessoriesKEY+ Power on KEY2Insert the charger AC plug into an AC wall outlet Latch, then slide the battery pack backPreparation Batteries Installing the AntennaInstalling the Hand STRAP/ Belt Hook PB-39 NiCd PB-38 NiCdAlkaline Installing Alkaline Batteries10 2 Insert four AA LR6 alkaline batteries Connecting with a Regulated Power Supply Connecting with a Cigarette Lighter SocketFirst QSO Operating Basics Switching Power ON/OFFAdjusting Volume Selecting a BandPress F, Moni Adjusting SquelchPress OK to complete the setting Press UP/ DWN to select from 6 squelch levelsReduce battery consumption, if communication is still When you finish speaking, release the PTT switchSelecting lower transmit power is a wise method to Reliable. You can program a different power for bandGetting Acquainted Indicators UP/ DWN keys Cursor KeysBand a & B OK keyMemory Recall mode Function Select modeVFO mode Menu modeCommands to the built-in TNC from a personal computer Full Duplex modePacket mode Press TNC twice to select. In this mode, you can sendKeypad Direct Entry Quick Reference Guide Ctcss ON/ OFF Key Operation Function1 s VFO FMenu Access Menu SET-UPMenu Configuration Level Selections DefaultAprs Radio AUXLevel Selections OFFCMD SstvSKY Operating Through Repeaters Offset Programming FlowFollowing methods to bring the transmit frequency Programming OffsetPress UP/ DWN to select the appropriate offset Frequency Within the band limits67.0 97.4 136.5 192.8 Press F, 1 to switch the Tone function on or OFFPress UP/ DWN to select the appropriate tone frequency Automatic Repeater Offset A. and Canada versionsReverse Function Press REV to switch the Reverse function on or 13 OFFPress REV 1 s to switch the function on Automatic Simplex Check ASCTone FREQ. ID Parameter Memory ChannelsCHANNEL? Ctcss onPress UP/ DWN to select the desired memory channel Press OK Press PTT+OKClearing a Memory Channel Press MR+ Power onRecalling a Memory Channel Press UP/ DWN to select the desired memory ChannelRepeat steps 3 and 4 to enter up to 8 digits Naming a Memory ChannelPress UP/ DWN to select the first digit Press PTT+CALL Call Channel TH-D7A onlyPress VFO MEMORY-TO-VFO Transfer Channel DisplayVHF Band Defaults Version VFO Freq Tone Partial or Full RESET?Press F+ Power on UHF Band DefaultsScan Type Scan Range ScanThis transceiver provides the following types of scans Seek mode Time-Operated modeCarrier-Operated mode Selecting Scan Resume MethodPress VFO 1 s VFO ScanMemory Scan Press MR 1 sMHz Scan To quit MHz Scan, press ESCPress F, MR Program ScanSelect the desired frequency as the lower limit Recall the desired memory channel CALL/VFO Scan TH-D7A onlyCALL/MEMORY Scan TH-D7A only Press F, 4 to select F-4 Ctcss Freq Continuous Tone Coded Squelch System CtcssSelecting a Ctcss Frequency Press UP/ DWN to select the appropriate Ctcss frequencyCtcss FREQ. ID Using CtcssPress F, 3 to switch the Ctcss function on or OFFFreq. Hz 1209 1336 1477 1633 Dual Tone MULTI-FREQUENCY Dtmf FunctionsManual Dialing Press OK Automatic DialerPress UP/ DWN to select a character Transmitting a Stored Dtmf Number Press PTT+MENUMicrophone Control Data is accepted for the digits entered and 0 is Auxiliary FunctionsDirect Frequency Entry Programmed for the digits not yet enteredChanging Frequency Step Size Programmable VFOBeep ON/OFF Press F, ENT to switch Tone Alert on or OFFTone Alert Lamp Function Adjusting Volume BalanceAdjusting Display Contrast Blanking a Band DisplayAutomatic Power OFF APO Battery Saver13 3 Press UP/ DWN to select a character POWER-ON MessageTransceiver Lock 15 4 Press OKTX Inhibit Switching AM/FM Mode TH-D7A onlySwitching TX Deviation TH-D7E only Advanced Intercept Point AIPBe available at any store that handles Amateur Radio Packet OperationReference material for starting packet operation should EquipmentConverse mode Connecting with a Personal ComputerCommand mode Operating TNCPacket operation. The shaded steps indicate operations Preparation FlowFollowing steps should guide you to a good start On your personal computer. First connectBand only Selecting Data BandFull Duplex Both BandsComment Press List to restore the frequency display DX Packetclusters MonitorSLOW-SCAN Television Sstv with VC-H1 22 4 Press OK Entering Call SIGN/ MESSAGE/ RSV20 3 Press UP/ DWN to select a character Executing Superimposition Selecting Color for Call SIGN/ MESSAGE/ RSVVC-H1 Power is onVC-H1 Control Automatic PACKET/ Position Reporting System Operation Flow New Aprs Duplicate Indicator Meaning What is Included?Receiving Aprs Data KEY12 2 Press UP/ DWN to select the desired station Accessing Received Aprs DataPress List 18 3 Press OKTemperature 13 4 Press OK Programming a Call Sign11 3 Press UP/ DWN to select a character 15 5 Repeat steps 3 and 4 to enter up to 9 digitsPress UP/ DWN to select from 15 icons plus Others Press OK Press Menu to exit Menu modeSelecting Your Station Icon Kenwood SstvPress 2, 3 to select 2-3 My Pos Press Menu to enter Menu modeEntering LATITUDE/ Longitude Data Selecting a Position Comment Press UP/ DWN to select the desired comment17 4 Press OK Entering Status TextPress UP/ DWN to select a character Special Programming a Group CodeAll calls Alternate netProgramming a Packet Path Repeat steps 3 and 4 to enter up to 32 digitsMethod 3 WIDEN-N path Method 1 Specific pathMethod 2 Generic path Method 4 Ssid pathBcon again Selecting Beacon Transmit MethodPress 2, 9 to select 2-9 Data TX Press UP/ DWN to select the desired interval Selecting Beacon Transmit IntervalRestricting Reception of Aprs Data Press UP/ DWN to select the desired distanceAprs Message KEY+NEW Data Message Type Accessing Received Aprs MessagesPress MSG StatusRepeat to enter a message or bulletin with up to 45 digits Entering a MessageRepeat steps 4 and 5 to enter up to 9 digits Transmitting a Message Press OK to start transmittingPreparation Wireless Remote Control TH-D7A onlyPress PTT+VFO+ Power on Press a numeric key 0 to 9 to enter a 3-digit secret numberENT or VFO UP/ DWN To recall a memory channel Press PTT+MR+ Power onControl Operation SKY Command 2 TH-D7A only Transporter with the HF transceiver. For these cables TransceiverYou can use the optional cables PG-4R to connect Contact your authorized Kenwood dealerOn the Commander Access Menu 4-4 and select Commander Programming a Tone Frequency On CommanderProgramming Call Signs On TransporterMode PowerUP/ DWN CLRPage Service Note MaintenanceService CleaningPress A/B+ Power on to exit TroubleshootingProblem Probable Cause Corrective Action Press BAL, then UP/ DWN to Page Problem Probable Cause Corrective Action HMC-3 Optional AccessoriesSMC-32 SMC-33 SMC-34 EMC-3 PB-38 PB-39 BT-11VC-H1 PG-4V PG-3JPG-4W PG-4RConnecting Other External Equipment Equipment ConnectionsSpecifications General VHF Band UHF BandTransmitter VHF Band UHF Band Appendix TNC Commands ListShort Default Parameter Description Firmrnr FIR OFF ON/ OFF DwaitEcho ON/ OFF Flow ON/ OFFLpath LPA GPS HbaudLocation LOC Every LtextPersist ResetTxdelay Ppersist ON/ OFFIndex
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144, 440 MHz TH-D7A, TH-D7A specifications

The Kenwood TH-D7A is a sophisticated handheld transceiver designed especially for amateur radio enthusiasts. It combines advanced features with user-friendly operation, making it a popular choice among both beginners and seasoned operators.

One of the standout features of the TH-D7A is its dual-band capability, allowing users to operate on both the 2-meter (144 MHz) and 70-centimeter (440 MHz) bands. This dual-band functionality gives operators increased flexibility and access to a wider range of communication channels. Additionally, the transceiver supports the simultaneous transmission and reception of two different frequencies, allowing for efficient monitoring of multiple communications.

The TH-D7A is equipped with an impressive 1,000 memory channels, which can be organized into 100 memory groups. This allows users to store a vast amount of frequencies and access them easily when needed. The transceiver also provides a wide frequency coverage, extending from 144 to 148 MHz and from 430 to 450 MHz in the VHF and UHF bands, respectively.

Another remarkable feature of the TH-D7A is its built-in Automatic Packet Reporting System (APRS) capabilities. This technology enables users to share real-time location data, send and receive messages, and provide status updates, making it an invaluable tool for outdoor activities and emergency communication.

In terms of construction, the TH-D7A features a durable and compact design, making it suitable for both portable and mobile use. The large, easy-to-read LCD display provides clear visibility in various lighting conditions. Additionally, the transceiver supports a variety of advanced voice modes, including FM, AM, and SSB (Single Side Band), offering a versatile communication experience.

The TH-D7A also incorporates a wide range of digital modes, enhancing its operational capabilities. With the included programming software, users can easily customize their settings, manage memory channels, and update firmware, ensuring the transceiver remains compatible with evolving technologies.

Power management is another highlight, as the TH-D7A provides adjustable output power levels, enabling users to conserve battery life when needed. Overall, the Kenwood TH-D7A is a feature-rich handheld transceiver that combines robust performance with innovative technology, making it a top choice for amateur radio operators seeking reliable communication in diverse environments. Its versatility, combined with its intuitive design, ensures it meets the needs of users across all experience levels.
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