Icom IC-751 [19/37] N n n 1

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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Rotating the control to the direction raises the receiving frequency and to the direction lowers one To turn OFF the RIT function push again the RIT switch and the letters RIT and shifted frequency displayed on the frequency display are no longer displayed When the RIT circuit is OFF the transmit and receive frequencies are the same regardless of the shifted frequency However the shifted frequency is stored in the memory and it will reappear when the RIT switch is pushed again Pushing the RIT switch to turn OFF the RIT 5 1 11 XIT TRANSMIT INCREMENTAL TUNING By using the XIT circuit you can shift the transmit fre quency 9 9KHz maximum either side of the receive fre quency without moving the receive frequency itself in like manner as the RIT function By pushing the XIT switch the XIT circuit is turned ON and the letters XIT and shifted frequency are displayed on the frequency display The transmit frequency can be shifted 10Hz steps by turning the INCREMENTAL TUN ING CONTROL USB 1 UJCTÜ 1 L LI 1 LI First pushing the XIT switch to turn ON the XIT ri 1 LI 1 VFO A l L 6 T a n LI 1 LI n LI ri 1 LI 1 VFO A Receiving and transmitting on 14 267 8MHz Pushing the RIT switch again to turn ON the RIT Turning the INCREMENTAL TUNING control counterclockwise To clear the shifted frequency push the RIT XIT CLEAR button and the shifted frequency becomes 0 0 The receive and transmit frequencies become the same regard less the RIT circuit is turned ON or OFF Pushing the RIT XIT CLEAR button XIT USB USB U I LI ri n u u n u XIT TO 1 LI _ J ci Cl LI J J 1 1 WO A Receiving on 14 267 8MHz and transmitting on 14 263 9MHz If the RIT has been turned ON before and the shifted frequency is stored in its memory now the RIT is OFF then the XIT is turned ON the shifted frequency stored in the RIT memory is reappeared on the display and it becomes the shifted frequency of the XIT RIT I UJL I I L LI USB 1UJC 1 I LU i i VFO A USB The RIT has been turned If you want to change the operating frequency displayed frequency to the receive frequency which is shifted by the RIT function push the FUNCTION KEY first then the RIT XIT CLEAR button and the shifted frequency is added to the previous displayed frequency and the operat ing frequency is changed to the previous receive frequency At the same time the shifted frequency is cleared to 0 0 and the set operates on the new displayed frequency for both the transmitting and receiving Pushing the RIT switch to turn OFF the RIT Pushing the RIT XIT CLEAR button n 7 1 I LI n n 1 LI LI ci LI i 1 VFO A USB 1 Wb 1 8 o i VFO A Receiving and transmitting on 14 267 8MHz USB XIT O 1 U J C l i i L o i a J 3 u inn VFO A Receiving on 14 267 8MHz and transmitting on 14 263 9MHz If you push the XIT switch to turn the XIT ON when the RIT has been turned ON already the XIT is also turned ON however its shifted frequency will be the same as that of the RIT So the set will operate on the same frequency which is shifted from the displayed frequency and it can be changed by turning the INCREMENTAL TUNING CONTROL in both the transmitting and receiving RIT I h I L LI Zi Ü J J Receiving on 14 263 9MHz and transmitting on 14 267 8MHz Pushing the XIT switch to turn ON the XIT USB RIT U3C1n I 1 C Ci 1 0 I VFO A NOTE The RIT circuit is operational when the frequency has been locked with the DIAL LOCK button as well as in the MEMORY CHANNEL MODE When the transmitting and receiving frequencies differ by more than 10KHz use VFO A and B in the DUPLEX SPLIT mode USB The RIT has been turned ON already RIT 18 8 6 18 19 s VFO A Receiving on 14 263 9MHz and transmitting on 14 267 8MHz 16