Kenwood TH-F6A, TH-F7E instruction manual Operation Notices

Page 56

15 TROUBLESHOOTING

OPERATION NOTICES

The transceiver has been designed and engineered to avoid possible hardware glitches. However, you may notice the following symptoms when you operate the transceiver. These symptoms are not malfunctions.

OPERATING VOLTAGE

As stated in “SPECIFICATIONS” {page 53}, this transceiver operates on a DC voltage from 5.5 V ~ 7.5 V DC (battery terminal) or 12.0 V ~ 16.0 V DC (DC IN jack). If you find that the transceiver cannot be switched ON, or “VOLTAGE ERROR” appears, the supplied power source may be outside of the specified range.

In such a case, remove the DC power cable from the transceiver immediately and confirm that the supplied voltage is within the specified range.

TUNING IN SSB/ CW MODE

The transceiver uses a general purpose IF filter to receive signals in LSB, USB, CW and AM modes. So, when you receive signals in LSB or USB mode, the opposite side band signal is not fully attenuated. At the same time, since the same filter is used for CW reception, you may have difficulties seperating the CW signal from other signals in the crowded band.

To best tune in to a SSB signal, follow the instruction below.

When you receive signals in USB mode:

1Turn the Fine Tuning function ON {page 35}.

2Tune to the target signal while starting at a lower frequency, using the Tuning control.

When you receive signals in LSB mode:

1Turn the Fine Tuning function ON {page 35}.

2Tune to the target signal while starting at a higher frequency, using the Tuning control.

RECEIVING IN AM BAND

If you receive a weak signal in AM band, you may notice a high pitched squealing noise in the background. This noise is generated by the internal DC/DC converter and it cannot be removed.

RECEIVING SIGNALS IN CITIES

When you receive signals in cities, the receiver’s entire S-meter may light up without receiving any strong signals. This happens when the RF amplifier in the receiver is overloaded by strong interference signals that are nearby. In this case, turn the Attenuator function ON {page 36} to reduce the interference signal level. You may further have to adjust the volume level while receiving the target signal.

BEAT AND NOISE

When you have the same 2 m, 1.25 m (TH-F6A only), and 70 cm band frequencies for both A and B-band receivers, the Visual Scan may indicate the signals on the bar-graph display even if no signal is monitored on the A-band receiver. This error occurs due to the internal spurious harmonics that are generated by the B-band-receiver. Refer to “INTERNAL BEATS” {below} for the frequencies.

You may also hear some noise in the receiving signal in the following cases.

•You perform any scan on the other receiver.

•You perform the Visual Scan on the B-band receiver.

TRANSMISSION

If you continuously transmit for more than 3 minutes at high power (5 W), the transceiver becomes warm. If you continue or repeat the transmission before the transceiver cools down, the thermal protector automatically decreases the output power to 0.5 W. “H” also blinks at the same time. If this happens, let the transceiver cool down for a while before transmitting again.

INTERNAL BEATS

If one of the formulas on the next page is true, the S-meter moves without receiving any signals or you cannot receive any signals. This is inevitable when you use superheterodyne receivers.

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Contents TH-F6A Market Codes PrecautionsModels Covered by this Manual Features Supplied AccessoriesThank YOU Thank YOUContents Wireless Remote Control Optional AccessoriesTroubleshooting SpecificationsInstalling the Antenna Installing Alkaline BatteriesInstalling the Belt Clip PreparationPreparation Connecting to a Cigarette Lighter SocketConnecting to a Regulated Power Supply Your First QSO First QSOGetting Acquainted Keys and ControlsDisplay Getting Acquainted0VOX 7DCSBasic Operation Getting Acquainted Transmitting Selecting a FrequencyENT ENT VFOMenu Setup What is a MENU?Menu Access Selecting a Menu LanguageMenu Setup On the Display Menu No Selections Default Alphabetical Function ListOperating Through Repeaters Offset Programming FlowProgramming Offset Selecting Offset DirectionAutomatic Repeater Offset Operating Through RepeatersActivating Tone Function Selecting a Tone FrequencyAutomatic Simplex Check ASC Reverse FunctionTone FREQ. ID Scan Memory Channels Parameter Simplex Odd-SplitCtcss on DCS onMemory Recall Mode Using the Tuning Control or / KeysUsing a Numeric Keypad Memory Channels Recalling a Memory ChannelDtmf Naming a Memory ChannelMemory Channels Memory Channel Transfer Group Delete FunctionMemory Group Function Memory \ VFO TransferCall Channel Recalling the Call ChannelReprogramming the Call Channel Channel 0 ~Information Channels Recalling AN Information ChannelReprogramming the Information Channel WeatherChannel Display KEYScan Normal ScanBand Scan Scan Type PurposeScan Program Scan Storing Program Scan Frequency RangePerforming the Program Scan Press VFOMemory Scan ScanALL-CHANNEL Scan Group ScanUsing Priority Scan Call ScanPriority Scan Programming Priority ChannelsVisual Scan Using Visual Scan VFOInformation Channel Scan Memory Channel Lockout Scan Using Visual Scan Memory ChannelScan Resume Method Using Ctcss Selective CallCtcss Selecting a Ctcss FrequencyUsing DCS DCSSelective Call Ctcss FREQ. ID Scan Selecting a DCS CodeSelective Call DCS Code ID Scan Dtmf Functions Manual DialingAutomatic Dialer Dtmf TX HoldAdjusting the Dtmf Tone Transmission Speed Adjusting the Pause DurationDtmf Lock Dtmf FunctionsUtilizing the B-BAND About the B-BANDBand Frequency Band Frequency Coverage TH-F6ASelecting a Mode for the B-BAND BAR AntennaUtilizing the B-BAND LSB/ USB/ CW/ AM/ FM/ WFMSelecting a Fine Tuning Frequency Step Fine TuningActivating Fine Tuning Battery Life Battery RemainingBattery Type Operator ConveniencesBattery Saver Display ContrastBeat Shift Beep FunctionTune Enable LampLock Function Microphone PF Keys OptionalPOWER-ON Message MonitorNarrow Band FM Operation Programmable VFOTIME-OUT Timer Single Band OperationTone Alert TX InhibitTX Power Volume BalanceVOX VOICE-OPERATED Transmit VOX GainVOX Delay Time VOX on BusyWireless Remote Control TH-F6A only PreparationControl Operation Tone SELPG-2W PG-3J Optional AccessoriesEMC-3 HMC-3 Interfacing to Peripherals SP/MIC JackSelecting SP/MIC Jack Function SP/MICInterfacing to Peripherals General Information TroubleshootingBackup Battery Troubleshooting TroubleshootingProblem Probable Cause Corrective Action Press A/B+Troubleshooting Microprocessor Reset Operation Notices Internal Beats Frequency Formula Specifications TH-F6A TH-F7ESpecifications LSB/ USB/ CW/ AM/ FMAppendix TV Channels VHFTV Channels UHF AppendixMarine Channels VHF Citizen Band ChannelsIndex CtcssDCS Dtmf
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