Icom IC-751 [26/37] 6 cw operation
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Icom IC-751 [26/37] 6 cw operation

Icom IC-751 [26/37] 6 cw operation

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Adjust the MIC GAIN CONTROL to a point where the meter needle swings between 10dB and 20dB on the COMP 5 5 6 FILTER SWITCH This switch selects the combination of the internal filters When an optional filter is installed this function will be more effective Select and install the optional filter s to suit your favorite mode s Refer to 6 1 OPTIONAL FILTERS on page 28 scale The Speech Processor should be turned OFF or MIC GAIN CONTROL carefully set for minimum compression for all communication other than DX operation for a very natural voice quality 5 5 7 NOTCH FILTER This circuit notches a frequency in the IF pass band so this is effective to reduce interference such as a beat tone signal 5 5 10 HOW TO USE THE VOX CIRCUIT The IC 751 has a built in VOX voice operated relay which allows automatic T R switching by voice signals into the microphone For VOX use set the knobs and switch as follows To use this function push the NOTCH FILTER switch ON and turn the NOTCH FILTER control so that the inter ference is reduced VOX GAIN CONTROL FULLY COUNTERCLOCKWISE OFF position VOX DELAY CONTROL FULLY CLOCKWISE ANTI VOX CONTROL on the top FULLY COUNTERCLOCKWISE 5 5 8 TRANSMITTING Before transmitting listen in the receive mode to make sure your transmission will not interfere with other communi cations If possible use a dummy load for adjustment instead of an antenna Set knobs and switches as follows Turn the VOX GAIN CONTROL on the front panel to click ON Leaving the T R switch in the RECEIVE position and without pushing the PTT switch turn the VOX GAIN con trol further clockwise while speaking into the microphone At a certain point the T R switching circuit will be acti vated by your voice This is the proper position for the VOX GAIN control Set the VOX GAIN control at a level which provides for T R switching at your normal voice level Transmit release time the delay before the set auto matically returns to receive when you stop talking is controlled by the VOX DELAY control Turning the con trol counterclockwise makes the time shorter Set it at a position which is comfortable and which allows for short pauses in normal speech MIC GAIN CENTER 12 o clock position RF POWER CONTROL FULLY COUNTERCLOCKWISE METER SWITCH ALC Other knobs and switches are left in the same positions as for receiving When the T R switch is moved to transmit or when the PTT push to talk switch on the microphone is depressed the TRANSMIT Indicator is illuminated By speaking into the microphone the meter needle will move according to the strength of your voice and SSB signals will be transmitted Set the MIC GAIN control so that the meter needle stays well within the ALC zone at voice peaks If you wish to increase the output power turn the RF POWER Control clockwise and adjust to obtain the desired RF output power of between 10 watts and 100 watts approximately Adjust the ANTI VOX control on the top so that the VOX circuit is not activated by sounds from the speaker by turning the control clockwise while receiving a signal Change to the receive mode by moving the T R switch to receive or release the microphone PTT switch 5 5 11 MONITOR The transmitting IF signals can be monitored in the SSB mode So you can check the quality of the transmitting signals and conditions of the speech processor and so on 5 5 9 HOW TO USE THE SPEECH PROCESSOR The IC 751 has a low distortion RF speech processor which enables greater talk power and better results in DX opera tion Follow the steps below for use of the Speech Pro cessor To use this function push the MONITOR switch in on the front panel and adjust the MONITOR LEVEL control on the top to a comfortable audio level At this time use headphones to prevent howling which will be caused by picking up sounds from the speaker MIC GAIN CONTROL CENTER 12 o clock position RF POWER CONTROL Fully Counterclockwise COMP SWITCH ON METER SWITCH COMP 5 6 CW OPERATION 5 6 1 RECEIVING For CW reception push the MODE SELECT Switch for CW mode or CW N mode first the FUNCTION key then the CW switch when an optional CW narrow filter is installed Other switches and knobs are set the same as for SSB reception Switch to transmit and turn the RF POWER CONTROL clockwise while speaking into the microphone until you obtain the desired RF PEAK output power of between 10 watts and 100 watts approximately 23

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