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Icom IC-751 [2/37] Ic 75h

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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

Icom IC-751 [2/37] Ic 75h

Содержание

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