Icom IC-751 [22/37] 3 tuning by up down buttons on
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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If you wish to transfer this operating frequency 14 295 MHz and mode USB into a VFO push the FREQUENCY TRANSFER button and the operating frequency 14 295 MHz and mode USB are transferred into the VFO pre viously selected NOTE Frequency mode and HAM GENE mode to be memorized Pushing the DFS switch in and turning the TUNING CONTROL Don t push the VFO MEMORY switch before pushing the FREQUENCY TRANSFER button to transfer the operating frequency at this time 14 295MHz or the operating frequency is erased and the original memorized frequency 14 271 MHz will be transferred into the VFO Pushing the VFO MEMORY switch to check contents of the channel Pushing the VFO MEMORY switch to return to the VFO then pushing the MEMORY WRITE button If you wish to rewrite the memorized frequency in the selected channel at this time 07 to this frequency 14 295 0 push the MEMORY WRITE button and the operating frequency 14 295MHz and mode USB are memorized into the memory channel 7 To change the operating memory channel again push and release the DFS switch then turn the TUNING CONTROL 5 2 3 MEMORY WRITE PROGRAMMING THE MEMORY CHANNELS Any operating frequency mode and HAM GENE mode can be memorized into a memory channel This is displayed after pushing the VFO MEMORY switch 5 2 4 MEMORY CLEARING If you want to clear contents of a memory channel the first select the channel to be cleared the second push the FUNCTION KEY then the MEMORY WRITE or FRE QUENCY TRANSFER button The contents of the channel will be cleared 1 Set the operating frequency mode and HAM GENE mode to desired ones by a VFO For example set them for 15 725MHz AM and GENE by using VFO B 2 Push the DFS switch in then select a memory channel to be memorized by turning the TUNING CONTROL For example select it at memory channel 10 3 To check the contents in the memory channel push the VFO MEMORY switch and the contents are displayed on the frequency display If you don t like to rewrite these contents select another memory channel which has contents erasable or no memorized frequency When no frequency h s been memorized only the MHz and KHz decimals are displayed at the frequency posi tion After checking push the VFO MEMORY switch again to return to the VFO Pushing the FUNCTION KEY first then the MEMORY WRITE or FREQUENCY TRANSFER button USB GENE 4 One push of the MEMORY WRITE button erases the previous memorized contents if any and memorizes the displayed frequency mode an HAM GENE mode into the selected memory channel at this time channel 10 5 3 TUNING BY UP DOWN THE MICROPHONE BUTTONS ON 5 3 1 FREQUENCY CONTROL With each push of the UP or DN down button on the optional microphone the operating frequency is changed one increment up or down respectively In the same way by depressing the button continuously the operating fre quency is changed up or down the same as turning the TUNING CONTROL The tuning rate is according to the setting of the TUNING RATE switch 5 Memorize other desired frequencies and so on into memory channels in the same manner Memory channel 1 and 2 are used also for the PROGRAMMED SCAN For PROGRAMMED SCAN operation refer to SCANNING OPERATION on page 20 19