Icom IC-751 Инструкция по эксплуатации онлайн [18/37] 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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FOR EXAMPLE When VFO A is 14 271MHz and USB and VFO B is 29 670MHz and FM pushing the VFO switch to select VFO A then the VFO EQUALIZING switch VFO B s frequency and operating mode become the same as VFO A s 14 271MHz and USB Now the VFO A s frequency is memorized in the VFO B and you can operate anywhere with VFO A or B When you want to return to the pre vious frequency 14 271 MHz switch back to the other VFO To reverse this A the same as B select VFO B first then the VFO EQUALIZING switch It also allows you to search for a clear frequency with one VFO while keeping your operating frequency on the other VFO When you have found a clear frequency switch back to your operating frequency inform the station you are in contact with of the new frequency and switch back It s that simple 5 1 8 DUPLEX SPLIT SWITCH The DUPLEX SPLIT switch changes the relationship of the two VFO s Each push turns the function ON and OFF alternately When the function is OFF one VFO is for both receive and transmit When the function is ON the letters DUP are displayed on the frequency display and one VFO is for receive and the other VFO is for transmit So that this will allow you to operate on split receive transmit frequencies VFO A displayed USB IUJT II L I n I LI VFO A VFO B hidden FOR EXAMPLE Set VFO A to 7 057MHz and VFO B to 7 255MHz Push the VFO switch to return VFO A then the DUPLEX SPLIT switch to ON 7 057MHz will be shown on the display during receive VFO A and 7 255MHz during transmit VFO B You are now receiving on 7 057MHz and transmitting on 7 255MHz Pushing the VFO switch to reverse the above Pushing the VFO EQUALIZING switch VFO A displayed LSB Receiving VFO A T n c I n I LI J I LI VFO B hidden n LI VFO A 5 1 10 RIT RECEIVE INCREMENTAL TUNING By using the RIT circuit you can shift the receive fre quency 9 9KHz maximum either side of the transmit frequency without moving the transmit frequency itself Therefore when you get a call slightly off frequency or when the other station s frequency has been drifted you can tune in the frequency without disturbing the transmitt ing frequency Transmitting VFO B Each VFO stores operating mode too If different mode is stored in each VFO a crossmode OSO can be possible as well By pushing the RIT switch the RIT circuit is turned ON and the letters RIT and shifted frequency are displayed on the frequency display The receive frequency can be shifted 10Hz steps by turning the INCREMENTAL TUNING CONTROL First pushing the RIT switch to turn ON the RIT RIT USB uJ 1 1 L 6 TO L LI n LI n LI Fl 1 LI 1 VFO A Receiving and transmitting on 14 267 8MHz Turning the RIT control counter clockwise 5 1 9 TRANSFERRING VFO FREQUENCY The VFO EQUALIZING switch allows either VFO s to be brought to the exact frequency of the other VFO without turning the tuning control and the operating mode RIT USB 11 _ 6 TO L LI 3 3 n1 LI 1 VFO A Receiving on 14 263 9MHz and transmitting on 14 267 8MHz 15