Icom IC-751 [7/37] 8 rtty

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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3 4 ANTENNA Antennas play a very important role in radio communi cation If the antenna is inferior your transceiver cannot give you the best performance With a good antenna and feeder cable having 50 ohms impedance you should easily get the desired matching and performance Carefully install a high performance antenna that suits the frequency band s you wish to operate on and place it as high as possible Be especially careful of the condition of the connectors as loose connections will deteriorate the performance Be sure to connect the ground terminal of a whip antenna if used to the body of your car As the output is quite high avoid connecting the antenna connector to open lines and do not transmit under mis matched conditions Otherwise the final stage could be overloaded and cause a malfunction of the unit 3 8 CW KEY When operating CW connect a key to the KEY jack on the rear panel with the key plug supplied 1 4 inches standard plug The connection of the plug is shown below Since the IC 751 has a General Coverage receiver it is recommended that a long wire general coverage antenna and an antenna coupler be used The antenna s impedance should be 50 ohms To attempt to use the Ham band antenna for general coverage reception could result in mismatching and attendant poor reception 3 5 GROUND In order to prevent electrical shocks TV I BCI and other problems be sure to connect a heavy wire ground as short as possible from a good earth point to the ground terminal on the rear panel 3 6 MICROPHONE The optional electret condenser type hand microphone IC HM12 or stand microphone IC SM6 can be used Merely plug it into the proper receptacle on the front panel Should you wish to use a different microphone make certain it has proper output level Particular care should be excercised in wiring also as the internal electrical switching system is dependent upon it Refer the schematics for the proper hookup If the terminals have polarity be sure to make the correct connection Note that the keyed voltage when switching with semiconductors or relays with resistors in the circuit should be adjusted to be below 0 4 Volts 3 8 RTTY When operating RTTY connect the ACC socket pins 8 ground and 9 to your tele typewriter through a high speed relay or a level converter to TTL level and the tones for your terminal unit will be available from pin 4 The AF output level is about 300mVp p for S 9 signal For details refer to 5 7 RTTY OPERATION on page 24 3 9 EXTERNAL SPEAKER The IC 751 contains an internal speaker and is also designed so that it can drive an external speaker from the external EXT speaker jack on the rear panel Be sure the impedance of the external speaker is 8 ohms and remember that with the external speaker connected the internal speaker is disabled 3 10 HEADPHONES Any good headphone set including stereo type that have 4 16 ohms impedance can be used With the plug inserted halfway into the PHONES jack both the headphone and speaker will operate This is convenient when others wish to listen in on the station or you wish to record contacts 4