Icom IC-751 Инструкция по эксплуатации онлайн [30/37] 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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Since the IC 751 has a General Coverage receiver built in any frequency s WWV can be received Merely set to the GENERAL COVERAGE mode and tune to the desired frequency If a separate receiver is used connect it to the receiver antenna output terminal For a separate receive antenna connect it to the receiver input terminal 5 11 5 TRANSVERTER CONNECTION When a transverter control signal 8V is applied to Pin 11 of the ACCESSORY socket the TRANSVERTER terminal can be used for a VHF UHF transverter INPUT OUTPUT terminal The WWV signal can be used for alignment of a frequency counter marker oscillator or the frequency display 5 11 3 SIMPLE FREQUENCY ALIGNMENT A very accurate frequency counter is necessary to align the frequency of the IC 751 However the frequency can be aligned simply by receiving the WWV signal The transverter s input output frequency and signal level should be as follows 1 Set the frequency display to 10 000 0MHz or other standard frequency you can receive clearly in the GENERAL COVERAGE mode and the operating mode to AM then make sure that you are receiving the WWV signal Transverter INPUT OUTPUT Frequency 28 30MHz Input Output Level Transmit Output Max 30mV across a 50 ohm load Receive Input 1 juV for S N 10dB 2 Turn ON the MARKER switch on the top 5 11 6 LINEAR AMPLIFIER CONNECTION The jacks on the rear panel marked ALC and RELAY are a relay built in for keying a linear amplifier and the input for ALC from the linear amplifier For linear ampli fier hookup the RELAY jack is for an internal relay and the ALC jack is for ALC input The capacity of the relay is 24V 1 A Do not exceed this limit 3 Since a beat tone will be heard adjust the MARKER CALIBRATOR on the top so that the beat tone becomes zero beat When the standard frequency signal is modu lated with a single audio tone it makes more easily 4 This calibrates the reference oscillator frequency so it is not necessary to calibrate on any other frequency even if the operating band is different 5 Turn OFF the MARKER switch 5 11 4 RECEIVE ANTENNA TERMINALS The RECEIVE ANT IN jack is connected to the input terminal of the receiving section and the RECEIVE ANT OUT jack is connected to the antenna connector through the internal T R antenna switching circuit The optional linear amplifier IC 2KL and automatic antenna tuner IC AT100 AT500 can be connected to the IC 751 with their accessory cables as same as other ICOM HF transceivers Refer to their instruction manuals for detail The IC 751 puts out the band control voltage to change operating band automatically for external equipment such as a linear amplifier and antenna tuner The voltage is put out from Pin 13 of the accessory socket Refer to page 11 These two jacks are normally jumpered with a cable but can be used for Band Control Voltage Chart 1 A receiving preamplifier 2 A separate receiver 3 Separate receiver and transmitter antennas BAND MHz Band Control Voltage 1 8 7 0 8 0V 3 5 If you wish to use a receiver preamplifier connect it bet ween the receiver input and antenna output terminals 5 0 5 5V 14 4 0 4 5V 18 21 3 0 3 5V 24 28 2 0 2 5V 10 27 6 0 6 5V 7 0 1 2V