Icom IC-751 Инструкция по эксплуатации онлайн [14/37] 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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55 ANTENNA ANT CONNECTOR This is used to connect an antenna to the set Its imped ance is 50 ohms and connect with a PL 259 connector 66 ACCESSORY ACC SOCKET Various functions are available through the accessory socket such as modulation output receiver output T R changeover and so forth The table below shows those terminals 56 KEY JACK For CW operation connect a key here using a standard 1 4 inch plug For electronic keying the terminal voltage must be less than 0 4V DC ACC SOCKET CONNECTIONS 57 EXTERNAL SPEAKER JACK When an external speaker is used connect it to this jack Use a speaker with an impedance of 8 ohms When the external speaker is connected the built in speaker does not function Outside view PIN No 58 EXTERNAL ALC TERMINAL This terminal can be used for input terminal of external ALC signal from a linear amplifier or transverter The ALC voltage should be in 0V 4V 1 Output from the squelch control stage 8V when the squelch is ON 2 13 8 Volts DC in conjunction with the power switch operation Connected to Push to talk T R change over switch When grounded the set operates in the transmit mode Output from the receive detector stage Fixed output regardless of AF output or AF gain Output from Transmitter MIC amplifier stage Input for MIC gain control stage 8 Volts DC available when transmitting relay can not be directly actuated Max 5mA Input for external ALC voltage Ground Input for RTTY keying MARK HIGH level SPACE LOW level NC No Connection Input for TRANSVERTER control When 8 Volts DC is applied the set can operate with a transverter Output reference voltage for band switching Output for external band switching NC 3 59 T R CONTROL TERMINAL Controls Transmit Receive for an external linear amplifier or transverter This terminal can be used to switch 24V 1A DC Don t exceed this limit 60 RECEIVER INPUT TERMINAL This is an input terminal which is connected directly to the receiver 6 61 RECEIVER ANTENNA OUTPUT TERMINAL This is a terminal to which received signals from the anten na connector are conducted after the signal passes through the transmit receive antenna switching circuit Usually the receiver IN and OUT terminals are jumpered The receiver antenna output terminal is usually used when another receiver is used or a preamplifier is connected to the IC 751 9 7 10 11 12 13 14 24 62 SPARE TERMINAL This terminal is available for your personal use such as for adding accessory circuit etc if desired FUNCTION 67 OPTIONAL INTERFACE UNIT CONNECTOR POSITION This is provided to install the DP 25 connector of the optional interface unit 63 TRANSVERTER TERMINAL VHF and UHF operation using a suitable transverter with the IC 751 is possible This terminal is for Transverter connection The output is about 30mV 68 OPTIONAL BUILT IN AC POWER SUPPLY SOCKET POSITION This is provided to install AC power socket plate of the optional built in AC power supply IC PS35 64 GROUND TERMINAL To prevent electrical shock TVI BQI and other problems be sure to ground the equipment through the GROUND TERMINAL For best results use as heavy a gauge wire or strap as possible and make the connection as short as possible even in mobile installations 65 DC POWER SOCKET For connection of the IC PS15 s DC power cord or other suitable power supply 11