Kenwood TS-780 Instruction Manual

Also see for TS-780: Service manual Instruction manual Instruction manual

Use of SQUELCH controlThis control is used to eliminate noise when signal is ab-sent. Turn the control slowly until noise disappears. Whenthe control is properly adjusted, only the receive signal isheard from the speaker. This control is also used accordingto the strength of input signal during mobile operation.TransmissionNotes:1. Before transmitting, perform all the necessary pro-cedures for optimum reception. Make sure that the fre-quency you have selected does not interfere with otherstations.2. Check to make sure that the antenna connected is of theproper type. Use of an improper antenna will result notonly in insufficient power but also in TV1 and BC1.Do not attempt to operate the transceiver without con-necting antenna as it will cause damage to thetransceiver.Adjust forsuitablei=} volumea——,{ogooa)UoFig. 10 TransmissionSet the controls referring to Fig. 9. For transmission, usethe following procedure:1. Set the MODE switch to FM and the STANDBY switchto SEND (when the PTT switch is pressed, signal istransmitted at the REC position of the standby switch).Check to see that the RF meter is working and the ONAIR indicator is lit. Set the STANDBY switch to REC.2. Adjust the microphone gain by turning the FM MIC con-trol. Normally, optimum gain is obtained in the centerposition of the knob. If required, turn the controlcounterclockwise to reduce the gain.Use of LOW POWER SwitchThis switch is used to reduce transmit power duringoperation with a local station, thus preventing interferenceto other stations. It is also effective to reduce the powerconsumption.Set the switch to the up position and the transmit poweris reduced to about 1 watt.The transmit power is indicated on the RF meter. Sincethe indication on the RF meter depends on the installationcondition of antenna, it will not indicate the exact outputpower. If the meter indicates ‘’8’’ at the rated power, thenthe reading of the meter will be ‘’1’’ or ‘‘2’’ when the LOWPOWER switch is turned on.Note:The LOW POWER switch is used in FM mode only.5-3. SSB ModeReceptionOn VHF bands, USB is traditionally more often usedthan LSB. As far as the operating technique is concerned,there is no difference between two. Generally, the ‘‘zero-in’’ technique in SSB mode required a little experience.For SSB operation, set the knobs and switches asdescribed in section on ‘‘FM Mode’, except that the MODEswitch should in USB position.POWER SEND VOX ALC CEN NAOFF REC OMAN RES OFFTS-780MOveLFig. 12 Transmission in SSB ModeCenter position'CARL FM-Mic S-ToNE |VOX-G DELAY ANTIuO TLFig. 11 MIC GAIN AdjustmentAfter the settings have been completed, proceed asfollows:1. Turn the POWER switch ON and adjust the AF GAINknob for suitable loudness.2. Turn the VFO tuning knob slowly to receive SSB signal.First set the VFO knob a few kHz lower than the receivefrequency (turn the knob counterclockwise) and you willhear a high pitched tone such as is heard from amagnetic recording tape set in the fast-forward mode.Turn the knob clockwise for higher frequency and thesound will become clearer. Set the knob in such a posi-tion where the sound is heard most clearly (this is thezero-in point).+2