Icom IC-751 [31/37] 1 installation of optional filter

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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SECTION 6 OPTION INSTALLATION The following tools are needed for the installation of the options Phillips Screwdriver Screwdriver Solder De soldering braid Diagonal cutters Soldering Iron 40W Soldering tool Before performing any work on the set make sure that the power cord is detached from the transceiver After optional filters are installed and PBT control function as follows Remove the top and bottom covers by unscrewing the six screws each on the top and bottom and the three screws on each side while taking care not to damage the internal speaker and unplug its connector 1 When the FL 70 SSB wide filter is installed FILTER SWITCH OFF ON BANDWIDTH NARROW WIDE the FILTER switch PBTCONTROL EFFECTIVE NO WORK 2 When CW narrow filter is installed FILTER SWITCH OFF ON 6 1 INSTALLATION OF OPTIONAL FILTER 6 1 1 OPTIONAL FILTERS PREPARED We have prepared various optional filters as follows FL 32 FL 63 FL 33 FL 70 F L 52A FL 53 A CENTER FREQUENCY 9 0106MHz 9 0106MHz 9 0100MHz 9 0115MHz 455 0KHz 455 0KHz CHARACTERISTICS 250Hz 6dB 800Hz 60dB 125Hz 6dB 550Hz 60dB 3 0KHz 6dB 10KHz 60dB 1 4KHz 6dB 2 5KHz 60dB 250Hz 6dB 500Hz 60dB 125Hz 6dB 240Hz 60dB BANDWIDTH WIDE NARROW PBT CONTROL EFFECTIVE EFFECTIVE The control works as IF SHIFT function and tone pitch can be adjusted USABLE MODE CW R TTY CW R TTY AM SSB Wide CW R TTY CW R TTY 3 When FL 33 AM filter is installed When installing FL 33 cut the lead of W116 on the MAIN unit board Refer the photo The IC 751 has two positions for installing optional filters The B position is for a 9MHz filter one of the FL 32 FL33 FL 63 and FL 70 and the D position is for a 455KHz filter one of the FL 52A and FL 53A FILTER SWITCH OFF ON BANDWIDTH NARROW WIDE PBTCONTROL NO WORK NO WORK Please choose an optional filter which is suitable to your needs 6 1 2 ASSEMBLY PROCEDURE When installing FL 52A or FL 53A simply plug it into the specified position When installing a 9MHz filter 1 Remove nine screws at each edge and the center of the MAIN unit board and four screws at each corner of the FM unit board 28