Kenwood TH-F6A Instruction Manual

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Contents

5115 TROUBLESHOOTINGOPERATION NOTICESThe transceiver has been designed and engineeredto avoid possible hardware glitches. However, youmay notice the following symptoms when you operatethe transceiver. These symptoms are notmalfunctions.OPERATING VOLTAGEAs stated in “SPECIFICATIONS” {page 53}, thistransceiver 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 cannotbe switched ON, or “VOLTAGE ERROR” appears, thesupplied power source may be outside of thespecified range.In such a case, remove the DC power cable from thetransceiver immediately and confirm that the suppliedvoltage is within the specified range.TUNING IN SSB/ CW MODEThe transceiver uses a general purpose IF filter toreceive 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 CWreception, you may have difficulties seperating theCW signal from other signals in the crowded band.To best tune in to a SSB signal, follow the instructionbelow.When you receive signals in USB mode:1 Turn the Fine Tuning function ON {page 35}.2 Tune to the target signal while starting at a lowerfrequency, using the Tuning control.When you receive signals in LSB mode:1 Turn the Fine Tuning function ON {page 35}.2 Tune to the target signal while starting at a higherfrequency, using the Tuning control.RECEIVING IN AM BANDIf you receive a weak signal in AM band, you maynotice a high pitched squealing noise in thebackground. This noise is generated by the internalDC/DC converter and it cannot be removed.RECEIVING SIGNALS IN CITIESWhen you receive signals in cities, the receiver’sentire S-meter may light up without receiving anystrong signals. This happens when the RF amplifierin the receiver is overloaded by strong interferencesignals that are nearby. In this case, turn theAttenuator function ON {page 36} to reduce theinterference signal level. You may further have toadjust the volume level while receiving the targetsignal.BEAT AND NOISEWhen you have the same 2 m, 1.25 m (TH-F6Aonly), and 70 cm band frequencies for both A andB-band receivers, the Visual Scan may indicate thesignals on the bar-graph display even if no signal ismonitored on the A-band receiver. This error occursdue to the internal spurious harmonics that aregenerated by the B-band-receiver. Refer to“INTERNAL BEATS” {below} for the frequencies.You may also hear some noise in the receiving signalin the following cases.• You perform any scan on the other receiver.• You perform the Visual Scan on the B-bandreceiver.TRANSMISSIONIf you continuously transmit for more than 3 minutesat high power (5 W), the transceiver becomes warm.If you continue or repeat the transmission before thetransceiver cools down, the thermal protectorautomatically decreases the output power to 0.5 W.“H” also blinks at the same time. If this happens, letthe transceiver cool down for a while beforetransmitting again.INTERNAL BEATSIf one of the formulas on the next page is true, theS-meter moves without receiving any signals or youcannot receive any signals. This is inevitable whenyou use superheterodyne receivers.