Icom IC-751 [4/37] General

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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SECTION 1 SPECIFICATIONS GENERAL Harmonic Output More than 40dB below peak power output Spurious Output More than 60dB below peak power output Carrier Suppression More than 40dB below peak power output Unwanted Sideband More than 55dB down at 1000Hz AF input Microphone Impedance 600 ohms Input Level 12 millivolts typical Dynamic or Electret Condenser Microphone Optional IC HM12 or IC SM6 can be used Number of Semiconductors Transistors 105 FET 16 IC Includes CPU 51 Diodes 219 Frequency Coverage 2 0MHz Ham Band 1 8 MHz 3 45MHz 4 1MHz 6 95MHz 7 5MHz 9 95MHz 10 5MHz 13 95MHz 14 5MHz 17 95MHz 18 5MHz 20 95MHz 21 5MHz 24 45MHz 25 1MHz 27 95MHz 30 0MHz General Cover Receive Only 0 1MHz 30 0MHz Thirty 1MHz Segments or Continuous RIT XIT Coverage 9 9KHz Frequency Control CPU based 10Hz step Digital PLL synthesizer Independent Transmit Receive Frequency Available on same band Frequency Readout 6 digit 100Hz readout Frequency Stability Less than 200Hz after switch on 1 min to 60 mins and less than 30Hz after 1 hour Less than 500Hz in the range of 0 C 50 C Power Supply Requirements DC 13 8V 15 Negative ground Current drain 20A max at 200W input AC power supply is available for AC operation Antenna Impedance 50 ohms Unbalanced Weight 8 5Kg Dimensions 115mm H x 306mm W x 355mm D RECEIVER Receiving System SSB CW RTTY AM Quadruple Conversion Superheterodyne with continuous Bandwidth Control FM Triple Conversion Superheterodyne Receiving Mode Alr A3J USB LSB Fi Output FSK audio signal A3 F3 IF Frequencies 1st 70 4515MHz 2nd 9 0115MHz SSB 9 0106MHz CW RTTY 9 0100MHz AM FM 3rd 455KHz 4th 350KHz except FM with continuous Bandwidth Control Sensitivity SSB CW RTTY 0 1 0 5MHz Less than 0 5MV for 10dB S N 1 0MV for 10dBS N 0 5 1 6MHz Less than 1 6 30MHz Less than 0 1 5MV for 10dB S N 3MV for10dBS N 0 5MHz Less than AM 0 1 6MV for10dBS N 0 5 1 6MHz Less than 1MV for10dBS N 1 6 30MHz Less than FM 1 6 30MHz Less than 3MV for 12dB SIN AD Squelch Sensitivity 1 6 30MHz Less than 0 3 zV Selectivity SSB CW RTTY 1 15KHz Adjustable to 0 4KHz Min at 6dB 2 0KHz at 60dB AM 1 2KHz at 6dB 2 25KHz at 60dB When Filter switch ON 2 0KHz at 6dB 7 5KHz at 60dB FM 7 5KHz at 6dB 15KHz at 60dB Notch Filter Attenuation More than 45dB Spurious Response Rejection Ratio More than 60dB Audio Output More than 3 Watts Audio Output Impedance 8 ohms TRANSMITTER RF Power SSB A3 J 200 Watts PEP inputf CW A RTTY Fi 200 Watts input FM F3 200 Watts input AM A3 40 Watts output Continuously Adjustable Output power 10 Watts Max Emission Mode SSB Upper sideband and Lower sideband A3J CW At RTTY Frequency Shift Keying Fi AM A3 FM F3 Specifications are approximate and are subject to change without notice or obligation 1