Icom IC-751 [15/37] 1 how to tune

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 5 OPERATING INSTRUCTIONS 5 1 HOW TO TUNE Pushing the HAM GENERAL COVER SELECT switch The following instructions are for tuning in any mode Please read carefully and understand fully before turning ON your unit Proper tuning is necessary for optimum operation In the HAM BAND mode 5 1 1 PRESET When the power switch is turned ON the frequency display shows frequency HAM GENE HAM BAND mode or GENERAL COVERAGE mode mode and mode stored in the VFO A letters VFO A and 01 representing memory channel 1 and the set operates with the VFO A and displayed mode even if the previous operating mode was different In addition the RIT XIT DUPLEX mode and SCAN are turned OFF 5 1 3 BAND SWITCHING To change the operating band push the BAND SELECT FUNCTION switch in and rotate the TUNING CONTROL In the HAM BAND mode by turning the TUNING CONT ROL clockwise the operating band changes to the next upper band and counterclockwise changes to the next lower band and the operating frequency is initialized as follows FOR EXAMPLE USB unc3n 1 1 U J 1 LI n LI 1 Band VFO A 5 1 2 HAM BAND GENERAL COVERAGE SELECTION Each push of the HAM GENERAL COVER SELECT switch changes the set in the HAM BAND MODE and GENERAL COVERAGE MODE alternately In the HAM BAND MODE the frequencies available are those of the nine amateur bands between 1 8MHz and 28MHz including new three bands for both transmit and receive When you change the mode from the HAM BAND to GENERAL COVERAGE the set maintains the frequency that was in the HAM BAND mode When you change the mode from the GENERAL COVER AGE to HAM BAND if previous frequency was that of a HAM BAND the set maintains that frequency n U1 l H 1 LI Fl u 1 899 4 1 897 0 3 5 3 550 0 3 549 4 3 547 0 7 7 050 0 7 049 4 7 047 0 10 10 050 0 10 049 4 10 047 0 14 14 050 0 14 049 4 14 047 0 18 18 050 0 18 049 4 18 047 0 21 21 050 0 21 049 4 21 047 0 24 5 24 550 0 24 549 4 24 547 0 28 28 050 0 28 049 4 28 047 0 In the GENERAL COVERAGE mode UP 15 123 4 DOWN 15 123 4 4 4 14 123 4 16 123 4 USB 1n 1 LI USB CW RTTY 1 900 0 When the band reaches to the highest one in either mode it will automatically return to the lowest one or vice versa as per the following charts FOR EXAMPLE 1ÜnL 1 U J LSB AM FM 1 8MHz In the GENERAL COVERAGE mode by turning the TUN ING CONTROL clockwise the operating frequency changes to a frequency that is added 1MHz to the previous one 100KHz and lower digits of the frequency will remain as it had in the previous one By turning the TUNING CONT ROL counterclockwise the operating frequency changes to a frequency that is subtracted 1MHz from the previous one In the GENERAL COVERAGE MODE the set operates as a receiver in the range of 0 1MHz to 30MHz continuously In the HAM BAND mode Displayed Frequency MHz VFO A c In the GENERAL COVERAGE mode USB unc 1 1 LI J GENE 4 1 123 4 VFO A 29 123 4 4 0 123 4 If the previous frequency was not of any HAM BAND the frequency is initialized to 1 900 0MHz 4 29 123 4 In the GENERAL COVERAGE mode 0 123 4 4 1 123 4 USB 1 n Ij i n 1 LI L 1 LI 1 GENE Fl 1 LI 1 VFO A 12 4 I 00 123 4 29 123 4