Icom IC-751 Инструкция по эксплуатации онлайн [21/37] 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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on the frequency display In addition the letters MEMO are also displayed above the memory channel number to indicate the set is in the MEMORY CHANNEL MODE Turning the TUNING CONTROL clockwise FOR EXAMPLE When 14 271 MHz and USB are memorized in VFO A and 29 625MHz and FM are in MEMORY CHANNEL 1 by pushing the power switch ON the frequency display shows 14 271 0 USB VFO A and memory channel number 01 By pushing the VFO MEMORY switch the display will show 29 625 0 and FM memory channel number 01 and the letters MEMO above the channel number IN MEMORY CHANNEL MODE In the MEMORY CHANNEL MODE by pushing the DFS DIAL FUNCTION SELECT switch in the operating memory channel is locked on the displayed one and by turning the TUNING CONTROL the OPERATING FRE QUENCY displayed on the frequency display can be changed This is very convenient for tuning a slightly off frequency or to change the operating frequency or to rewrite the memorized frequency in the selected memory channel By turning the TUNING CONTROL memory channels can be selected Turning clockwise increases the channel number and counterclockwise decreases the number and the respective frequency mode and HAM GENE mode are displayed on the display When you select a memory channel that has never been stored any frequency the frequency display does not show any frequency but MHz and KHz decimals However the set works with the frequency and mode of the memory channel or VFO which was previously displayed FOR EXAMPLE Now you are operating on 14 271 MHz and USB with memory channel 7 If you want to change this frequency push the DFS switch in now you can change the displayed frequency By turning the TUNING CONTROL clockwise increases the frequency and counterclockwise decreases one the same as a VFO To tune to 14 295MHz turn the TUNING CONTROL clockwise to obtain the desired frequency 14 295 0 on the display FOR EXAMPLE When 7 012MHz and CW are memorized in memory channel 2 and no frequency is in channel 3 by turning the TUNING CONTROL clockwise the frequency display will show 7 012 0 CW MEMO and memory channel number 02 Bu turning the TUNING CONTROL clockwise furthermore the memory channel number will change to 03 but the channel has never memorized any frequency thus the display shows CW and only the MHz and KHz decimals However the set works with the frequency and mode of channel 2 i e 7 012MHz and CW Pushing the DFS switch in and turning the TUNING CONTROL When memory channel limits are reached i e 01 or 32 the next memory channel entered will be the opposite limit i e 32 or 01 USB U3DLn 1 1 L J J LI 18 MEMO LI