Icom IC-751 Инструкция по эксплуатации онлайн [16/37] 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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In the HAM BAND mode DOWN 7 050 0 UP 7 050 0 3 550 0 10 050 0 1 900 0 4 28 050 0 24 550 0 The differences of the frequency of the various modes 14 050 0 18 050 0 0 6KHz ____________ 3KHz 21 050 0 24 550 0 4 28 050 0 1 900 0 3 550 0 21 050 0 18 050 0 4 14 050 0 10 050 0 In the HAM BAND SSB mode the sideband will be auto matically selected to the one usually used on the band i e upper sideband USB for the 10MHz band and above and lower sideband LSB for the 7MHz band and below If reverse sideband is desired push the FUNCTION key first then push the SSB switch 5 1 3 TUNING CONTROL Rotating the TUNING CONTROL clockwise increases the frequency while turning counterclockwise decreases the frequency in 10Hz steps By turning the tuning control faster the 100Hz steps tuning rate is automatically selected However in the GENERAL COVERAGE mode when the operating frequency reaches the highest or lowest edge of that MHz range by turning the TUNING CONTROL con tinuously at this time the BAND SELECT FUNCTION switch is not pushed in the operating frequency will go to the next MHz range When the TUNING RATE switch is pushed in the 1KHz steps tuning rate is selected in any mode At this time the 100Hz digit of the frequency display is cleared to 0 5 1 4 FREQUENCY DISPLAY ON EACH MODE When the 7MHz band and LSB are selected the display will be as follow The frequency range of each band in the HAM band mode is shown in the following chart LSB H L H H n 1 U J U U LI VFO A When changing to other modes the display will be as follows USB USB Tnu1n U1 n 1 u i u Band Frequency Range 1 8 1 800 0 1 999 9 3 5 3 440 0 4 099 9 7 0 6 950 0 7 499 9 10 0 9 950 0 10 499 9 14 0 13 950 0 14 499 9 VFO A CW 1 0 3 3 3 CW ri 1 U1 VFO A RTTY RTTY 1 0 3 3 3 n1 18 0 17 950 0 18 499 9 21 0 20 950 0 21 499 9 24 0 24 450 0 25 099 9 28 0 27 950 0 29 999 9 LI 1 VFO A In the HAM BAND mode by turning the TUNING CONT ROL clockwise the operating frequency reaches to the high edge of the band for example 14 499 9MHz and further turning of the control brings the frequency to the low edge of the band 13 950 0MHz then continues up the fre quency from there Likewise by continuing to turn the TUNING CONTROL counterclockwise beyond the low edge of the band the frequency jumps up to the high edge and goes down from that frequency FM Tncin FM n LI 1 i U 3 i u VFO A AM AM 1 n LH J U n LI n1 LI 1 VFO A The displayed frequency shows the carrier frequency To avoid the trouble of recalibrating the dial when you change the operating mode the displayed frequency is set to shift to the carrier frequency of each mode automatically For the differences of frequency shifts of the various modes refer to the following figure In the GENERAL COVERAGE mode by turning the TUN ING CONTROL clockwise the operating frequency reaches the highest one of that MHz range for example 14 999 9 13