Icom IC-751 Инструкция по эксплуатации онлайн [10/37] 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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15 MODE SELECTIVE SCAN SWITCH When this switch is pushed only memory channels stored with the operating mode which is displayed on the fre quency display just prior to pushing this switch are selected by turning the tuning control or scanning 22 INCREMENTAL TUNING CONTROL Shifts the receive frequency 9 9KHz maximum to either side of the transmit frequency when the RIT is ON and shifts the transmit frequency to either side of the receive frequency when the XIT is ON 16 SCAN START STOP BUTTON Starts and stops any of the scan functions When depress ing it again to restart the scan it will start from the stopped frequency in the programmed scan or from the highest memory channel in the other memory scans Rotating this control clockwise side raises the receive or transmit frequency and counterclockwise side lowers the frequency with 10Hz steps and 1KHz and 100Hz digits of the frequency shifted are displayed on the fre quency display 17 DIAL LOCK SWITCH After the IC 751 is set to a certain frequency for rag chew ing mobile operation etc by pushing this switch the VFO is electronically locked at the display frequency thus inactivating the operation of the tuning control To change frequency the dial lock must first be disengaged by pushing and releasing this switch again When both the RIT and XIT switches are ON the receive and transmit frequencies are the same and this frequency can be shifted either side from the displayed frequency by the control 23 RIT SWITCH Switches the RIT Receiver Incremental Tuning circuit ON and OFF 18 TUNING CONTROL Rotating this control clockwise increases the frequency or the memory channel number while rotating it counter clockwise decreases it The frequency changes by 10Hz in any mode In 10Hz step tuning rate by turning the tuning control faster the 50Hz step tuning rate is automatically selected This makes it very convenient to make a QSY over a wide frequency range To turn ON the RIT push this button once At this time the letters RIT and shifted frequency are displayed on the frequency display If you desire to turn OFF the RIT push the button again The letters RIT and shifted frequency are no longer displayed however the shifted frequency is stored in the memory and if you turn ON the RIT again the shifted frequency appears on the display again This control is also used to select the operating band while the BAND SELECT FUNCTION switch is depressed 24 XIT SWITCH Switches the XIT Transmitter Incremental Tuning circuit ON and OFF 19 TUNING RATE SWITCH By pushing in this switch the operating frequency is changed to correspond to 1 KHz increments in any mode At the same time the 100Hz digit on the display is cleared to show 0 When this switch is pushed again and released the frequency is changed normally This switch allows you to quickly QSY over a great frequency range 20 DIAL FUNCTION SELECT SWITCH In the VFO operation by pushing in this switch the operating frequency displayed VFO frequency is locked and the memory channel number displayed on the fre quency display can be changed by turning the tuning control To turn ON the XIT push this button once At this time the letters XIT and shifted frequency are displayed on the frequency display The other functions are in like manners 25 RIT XIT CLEAR BUTTON By pushing this button a frequency INCREMENTAL TUNING control rs When pushing the FUNCTION KEY the shifted frequency is added to the shifted frequency is cleared to 0 0 shifted by turning the cleared to 0 0 first then this button displayed one and the 26 FILTER SWITCH Selects the combination of the second IF 9MHz filter and the third IF 455KHz filter to improve the selectivity In the MEMORY CHANNEL mode by pushing in this switch the memory channel is locked and the operating frequency displayed frequency can be changed by turning the tuning control 27 NOTCH FILTER SWITCH Switches the notch filter function ON and OFF 21 BAND SELECT FUNCTION SWITCH By pushing in this switch the operating band is changed by turning t e TUNING CONTROL In the HAM BAND mode each initialized frequency of the band is selected In the GENERAL COVERAGE mode the operating frequency is changed in 1MHz steps but the lower digits do not change 28 P B TUNE PASS BAND TUNING CONTROL Allows continuous tuning of the pass band selectivity by moving the filter up to 800Hz from the upper or lower side in SSB CW and RTTY Not only improves selectivity but also can improve the audio tone Normal position is in the center 12 o clock position and is 2 3KHz wide in SSB 7