Icom IC-751 [24/37] 5 ssb operation

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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5 5 SSB OPERATION 6 By turning the set into the transmit mode or rotating the TUNING CONTROL or pushing the VFO switch RIT or XIT switch VFO MEMORY switch or one of the MODE SELECT switches the scan stops and clears 5 5 1 RECEIVING After connecting an antenna microphone etc set knobs and switches as follows OFF OUT RECEIVE DOWN Completely Counterclockwise OFF position Completely Counterclockwise NB LEVEL CONTROL OFF position AGC SWITCH SLOW Completely Counterclockwise AF GAIN CONTROL RF GAIN CONTROL Completely Clockwise Completely Counterclockwise SQUELCH CONTROL Center 12 o clock Position TONE CONTROL OFF OUT TUNING RATE SWITCH OFF OUT DFS SWITCH BAND SELECT FUNCTION SWITCH OFF OUT DIAL LOCK SWITCH OFF OUT FILTER SWITCH OFF OUT PBT CONTROL Center 12 o clock Position NOTCH FILTER SWITCH OFF OUT NOTCH FILTER CONTROL Center 12 o clock Position DUPLEX SPLIT SWITCH OFF OUT PREAMP ATT SWITCH OFF POWER SWITCH T R SWITCH VOX GAIN CONTROL 7 When the operating frequency is higher than the high edge 14 300MHz and the SCAN START STOP button is pushed the scan starts from the operating frequency and scan down to the low edge but it will return to the memorized high edge frequency 14 300MHz and continue the scanning to the low edge If the operating frequency is below the low edge frequency 14 200MHz the scan frequency jumpes to the high edge frequency 14 300MHz and starts from the high edge Now push the POWER switch in The meter lamp will be illuminated after a few seconds a frequency mode and HAM GENE mode memorized in the VFO A and memory channel number 01 will be shown on the frequency display In SSB operation there is both a USB upper side band and an LSB lower side band In the HAM bands LSB is usually used on the 1 8 3 5 and 7MHz bands while USB is usually used on the 10MHz band and above The IC 751 selects the normally used sideband according to the band in which you are operating NOTE The auto stop functions with SSB or CW signals but the scan does not always stop at the exact carrier frequency When the scan stops on a signal tune into the signal for better reception by push ing a MODE switch for the proper mode if dif ferent and by rotating the TUNING CONTROL If you wish to operate with the opposite sideband first push the FUNCTION KEY then the SSB switch and the opposite sideband will be selected When you wish to operate on another band than the dis played one If the desired band is not a HAM band push the HAM GENERAL switch so that the letters GENE are displayed push the BAND SELECT FUNCTION switch in then turn the TUNING CONTROL so that the desired band is displayed 5 4 4 RESUMING SCAN All scan modes are provided with the resume scan function When the scan has been stopped by the auto stop function the scan will restart after passing a specified time about 10 seconds 21