Icom IC-751 Инструкция по эксплуатации онлайн [11/37] 68913

Содержание

• Ic 75h 1
• Ic 75h 2
• General 4
• Receiver 4
• Section 1 specifications 4
• Transmitter 4
• All band all mode all solid state 5
• Dual vfo 5
• General coverage receiver capability 5
• Memories 5
• Other features 5
• Outstanding receiver performance 5
• Section 2 features 5
• Transmitter 5
• 1 unpacking 6
• 2 recommendations for 6
• 3 power supply 6
• Be sure to read the following instructions carefully before operation 6
• Installation 6
• Section 3 installation 6
• 10 headphones 7
• 4 antenna 7
• 5 ground 7
• 6 microphone 7
• 8 cw key 7
• 8 rtty 7
• 9 external speaker 7
• 1 front panel 8
• 11 cooling fan 8
• By the monitor curcuit the fan will operate during both 8
• Cause of the overheating before starting to transmit again 8
• Cooling but with 200 watts input the final stage produces 8
• If the temperature rises to a danger limit 90 c the fan 8
• Mit modes 8
• Of the final stage the fan operates as follows 8
• Overheating i e antenna mismatch etc and correct the 8
• Perature monitoring circuit which monitors the temperature 8
• Plug inserted completely only the headphone works 8
• Power is reduced to 50 watts investigate the cause of 8
• Prolonged transmissions the fan is connected to a tem 8
• Quite a bit of heat and its temperature may rise during 8
• Section 4 operating controls 8
• The fan does not operate both in the receive and thans 8
• The headphone will lose the sound on one side with the 8
• The rear of the pa unit is designed to provide for adequate 8
• Transmit and receive to provide additional cooling 8
• Using a tape recorder connected to the headphone jack 8
• When the temperature rises to a point 50 c detected 8
• Will run much more rapidly at this time the output 8
• With a stereo headphone set inserted this way however 8
• 2 top cover 13
• 3 rear panel connections 13
• And attenuator are removed from the circuit and incoming 13
• Anti vox circuit with this control along with the vox 13
• Anti vox control 13
• Attenuation 13
• Calibrates the marker frequency with a standard frequency 13
• Controls the audio level of the monitoring ssb or cw side 13
• For normal operation leave this switch in the off 13
• Gain control so that the vox circuit only operates by the 13
• In vox operation the vox circuit may be operated by 13
• Marker calibrator 13
• Marker switch 13
• Monitor level control 13
• Operator s voice not by sound from the speaker 13
• Position 13
• Preamp att attenuator switch 13
• Put in the rf circuit and provides higher sensitivity 13
• Quency is available on every 10khz 13
• Signals will be fed to the receiver directly 13
• Sound from the speaker causing a switch to transmit this 13
• Such as the wwv 13
• Switches rf preamplifier and attenuator in the rf circuit 13
• The attenuator into the circuit this gives about 20db 13
• The switch in the pre position and the preamplifier is 13
• This removes the preamplifier from the circuit and inserts 13
• Tone when the monitor switch on the front panel is 13
• Trouble can be prevented by adjusting the input level of the 13
• Turned on adjust the control for comfortable monitoring 13
• Turns the marker circuit on or off the marker fre 13
• Very strong signal set this switch in the att position 13
• When nearby signals interfere with reception or receiving a 13
• When the switch is in the off position both preamplifier 13
• When using a small antenna or receiving a weak signal set 13
• 1 how to tune 15
• Section 5 operating instructions 15
• N n n 1 19
• 2 memory channel operation 20
• 3 tuning by up down buttons on 22
• The microphone 22
• 4 scanning operation 23
• 5 ssb operation 24
• 6 cw operation 26
• 7 rtty operation 27
• 8 am operation 28
• 9 fm operation 28
• 10 general coverage receiver 29
• 11 other operations 29
• 1 installation of optional filter 31
• Section 6 option installation 31
• 2 built in power supply unit 32
• Ic ps35 32
• Ic ом 37

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29 NOTCH FILTER CONTROL Shifts the notch filter frequency Adjust the control so that the interference is reduced 30 COMP SPEECH PROCESSOR SWITCH Switches the speech processor circuit ON and OFF This circuit enables greater talk power and better results in DX operation 31 MONITOR SWITCH In the SSB transmit mode the transmitting IF signals can be monitored by turning this switch ON At this time use headphones or reduce receiver audio volume to prevent howling This switch also turns the CW side tone circuit ON and OFF in the CW mode 32 NB TIMING SWITCH The noise blanker blanking time can be selected NORMAL and WIDE by this switch It will be effective against any types of noises 33 VOX GAIN CONTROL When the control is turned completely counterclockwise the VOX circuit is OFF By turning the control clockwise beyond the click the VOX circuit is turned ON and the VOX gain increases by further rotating it clockwise When the VOX is turned ON in SSB AM or FM T R switching is accomplished by means of a voice signal In CW operation semi break in or full break in switching by means of keying possible 38 MODE SELECT SWITCHES Selects any one of four operating modes by simply pushing the desired switch Additionally these switches have dual functions as follows 1 AM For AM operation FM Pushing the FUNCTION KEY first then AM switch the FM mode is selected the 2 CW For normal CW operation NARROW Pushing the FUNCTION KEY first then the CW filter when the optional 455KHz narrow CW filter is installed No sound can be heard when the optional filter is not in stalled 3 SSB Upper sideband USB for 10MHz band and above and lower sideband LSB for 7MHz in the GENERAL COVERAGE operation 9MHz band and below normal SSB opera tion will be selected REVERSE Lower sideband LSB for 10MHz band and above and upper sideband USB for 7MHz in the GENERAL COVERAGE operation 9MHz band and below will be selected 4 RTTY For normal RTTY operation NARROW Pushing the FUNCTION KEY first then the RTTY switch filter is switched to the narrow CW filter when the optional 455KHz narrow CW filter is installed No sound can be heard when the optional narrow CW filter is not installed For VOX operation in SSB AM or FM adjust the control so that the VOX circuit will operate with normal speech 34 VOX DELAY VOX time constant CONTROL This controls the transmit to receive switching time Adjust it so transmit to receive switching will not occur during short pauses in normal speech 39 MULTI FUNCTION METER When in the receive mode the meter acts as an S meter regardless of the position of the meter switch Signal strength is indicated on a scale of S1 S9 and S9 to S9 60dB In the CW operation adjust this control to suit your keying speed If the control is set at the FULL completely counterclockwise position it will reach full break in CW In the transmit mode the meter has six functions which are selected by the Meter Switch 6 35 NB LEVEL CONTROL Controls the threshold level of the noise blanker Adjust the control so that incoming noises will be disappeared 40 TRANSMIT INDICATOR Illuminates when the transceiver is in the transmit mode 36 FUNCTION KEY Increases the function of the MODE SELECT switches MEMORY WRITE button FREQUENCY TRANSFER button and RIT XIT CLEAR button by pushing this key switch first 41 RECEIVE INDICATOR Illuminates when the squelch is opened in the receive mode 42 NARROW INDICATOR Illuminates when the set is on CW Narrow or RTTY Narrow mode This indicator illuminates not only when the optio nal CW filter is installed but also if it is not installed 37 FUNCTION KEY INDICATOR This indicator is lit by pushing the FUNCTION KEY to indicate the second function will be selected and turned off by pushing one of the dual function switches or buttons 8