Icom IC-751 Инструкция по эксплуатации онлайн [9/37] 68913
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Icom IC-751 Инструкция по эксплуатации онлайн [9/37] 68913

Icom IC-751 Инструкция по эксплуатации онлайн [9/37] 68913

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1 POWER SWITCH The POWER SWITCH is a push lock type switch which controls the input DC power to the IC 751 When the external AC power supply IC PS15 or optional built in AC power supply IC PS35 is used the switch also acts as the AC power supply switch When the switch is pushed in and locked power is supplied to the set When the switch is pushed again and released power is cut to all circuits except the PA unit when using an external DC power supply 2 T R TRANSMIT RECEIVE SWITCH This switch is for manually switching from transmit to receive and vice versa Set the switch to RECEIVE down and the IC 751 is in the receive mode Set the switch to TRANSMIT up and it switches to transmit When switch ing with the PTT switch on the microphone or with the VOX switch set to ON the T R switch must be in the RECEIVE position 3 MIC CONNECTOR Connect a suitable microphone to this jack The optional hand microphone IC HM12 or stand microphone IC SM6 can be used If you wish to use a different microphone refer to the drawings on page 4 4 PHONES JACK Accepts a standard 1 4 inch headphone plug for headphones of 4 16 ohms Stereo phones can be used without modi fication 5 AGC AUTOMATIC GAIN CONTROL SWITCH For changing the time constant of the AGC circuit With the switch in the SLOW position the AGC voltage is released slowly and thus is suitable for SSB reception With the switch in the FAST position the AGC voltage is released faster and the AGC is suitable for stations suffering from fast fading or when operating in the CW mode When the control is in the OFF position the AGC function is turned OFF and the S meter does not swing even if a signal has being received The AGC does not actuate in the FM mode 6 METER SWITCH In the transmit mode the meter has six functions 6 SWR SWR can be measured by setting this switch to the Po position and calibrating the meter needle to the SET position with the RF POWER control then setting this switch to the SWR position 7 AF GAIN CONTROL Controls the audio output level in the receive mode Clock wise rotation increases the level 8 RF GAIN CONTROL Controls the gain of the RF section in the receive mode Clockwise rotation gives the maximum gain As the control is rotated counterclockwise the needle of the MULTI FUNCTION METER rises and only signals stronger than the level indicated by the needle will be heard In the FM mode regardless of the control setting the RF gain is fixed at the maximum 9 SQUELCH CONTROL Sets the squelch threshold level To turn OFF the squelch function rotate this control completely counterclockwise To set the threshold level higher rotate the control clock wise 10 TONE CONTROL Controls the receiver audio tone Adjust the control to provide comfortable reception 11 MIC GAIN CONTROL Adjusts the level of modulation according to the input of the microphone Clockwise rotation increases the micro phone gain As the input will vary with different micro phone and different voices the knob should be turned until the Meter needle in the ALC mode begins to move slightly within the ALC zone In the SSB mode when the speech processor is in use the MIC GAIN CONTROL sets a clipp ing limit while the RF POWER CONTROL sets the RF drive level to the maximum power level where ALC starts at the saturation point of the amplifiers 12 RF POWER CONTROL Controls the RF output power 10 Watts to maximum SSB 100 Watts PEP CW RTTY FM 100 Watts AM 40 Watts Clockwise rotation increases the output power 13 HAM BAND GENERAL COVER SELECT SWITCH Each push selects the function of the set alternately In the HAM BAND mode the transceiver functions in any of nine HAM bands between 1 8MHz and 28MHz In the GENERAL COVERAGE mode the set functions as a general coverage receiver between 0 1MHz and 30MHz The set will not transmit in this mode 1 Vc Indicates the collector voltage of the final transistors 2 Ic Indicates the collector current of the final transistors 3 COMP Indicates the compression level when the speech processer is in use 4 ALC Indicates the ALC level The meter begins to function when the RF output power reaches a certain level 5 Po Indicates an approximate RF output power 14 SPEECH SYNTHESIZER SWITCH When the optional speech synthesizer unit is installed this switch turns on the unit which announces the displayed frequency in English 6

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