Icom IC-751 [8/37] 11 cooling fan

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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using a tape recorder connected to the headphone jack With a stereo headphone set inserted this way however the headphone will lose the sound on one side With the plug inserted completely only the headphone works of the final stage The fan operates as follows 1 The fan does not operate both in the receive and thansmit modes 2 When the temperature rises to a point 50 C detected by the monitor curcuit the fan will operate during both transmit and receive to provide additional cooling 3 If the temperature rises to a danger limit 90 C the fan will run much more rapidly At this time the output power is reduced to 50 Watts Investigate the cause of overheating i e antenna mismatch etc and correct the cause of the overheating before starting to transmit again 3 11 COOLING FAN The rear of the PA unit is designed to provide for adequate cooling but with 200 Watts input the final stage produces quite a bit of heat and its temperature may rise during prolonged transmissions The fan is connected to a tem perature monitoring circuit which monitors the temperature SECTION 4 OPERATING CONTROLS 4 1 FRONT PANEL TRANSMIT INDICATOR 0 MULTI FUNCTION METER RECEIVE INDICATOR NARROW INDICATOR FREQUENCY DISPLAY VFO MEMORY SWITCH VFO SWITCH VFO EQUALIZING SWITCH MODE SELECT SWITCHES FUNCTION KEY INDICATOR 0 FUNCTION KEY NB LEVEL CONTROL NB TIMING SWITCH MONITOR SWITCH COMP SWITCH DUPLEX SPLIT SWITCH MEMORY WRITE BUTTON FREQUENCY TRANSFER BUTTON I INCREMENTAL TUNING CONTROL RIT SWITCH VOX GAIN CONTROL VOX DELAY CONTROL POWER SWITCH AGC SWITCH T R SWITCH METER SWITCH XIT SWITCH RIT XIT CLEAR BUTTON MIC CONNECTOR FILTER SWITCH PHONES JACK NOTCH FILTER SWITCH AF GAIN CONTROL PBT CONTROL RF GAIN CONTROL HAM GENERAL COVER SELECT SWITCH SQUELCH CONTROL NOTCH FILTER CONTROL TUNING RATE TONE CONTROL SWITCH SPEECH SYNTHESIZER SWITCH L MODE SELECTIVE SCAN SWITCH MIC RF GAIN POWER CONTROL CONTROL BAND SELECT FUNCTION SWITCH DIAL FUNCTION SELECT SWITCH SCAN START STOP BUTTON TUNING CONTROL DIAL LOCK SWITCH 5