User manual ICOM IC-761

[. . . ] This may result in an electric shock or burn. AVOID placing the transceiver against walls or putting anything on top of the transceiver. During mobile operation, DO NOT operate the transceiver without running the vehicle's engine. When transceiver power is ON and your vehicle's engine is OFF, the vehicle's battery will soon become exhausted. [. . . ] · Preamp1 activates the 10 dB preamp for the 1. 8 to 54 MHz range; preamp2 activates the 16 dB high-gain preamp for the 21 to 60 MHz range; preamp activates the VHF preamp for the 144 to 146 MHz range (108 to 174 for the USA version). P. AMP/ATT P. AMP/ATT Push [P. AMP/ATT] for 2 sec. once or twice to set the P. AMP/ATT attenuator ON or OFF. P. AMP/ATT · "ATT" appears in the display when the function is set ON. P. AMP/ATT P. AMP/ATT P. AMP/ATT 5-3 RIT function RIT (receiver incremental tuning) shifts the receive frequency up to ±9. 99 kHz in 10 Hz steps without shifting the transmit frequency. This is useful for fine tuning stations which call you on an off-frequency or when you prefer to listen to slightly different sounding voice characteristics, etc. Push [RIT] to turn the RIT function ON and OFF. · RIT and the RIT frequency appear in the function display when the function is ON. [RIT/TX] [RIT] [CLEAR] Rotate [RIT/:TX] to set a receive frequency shift. · Push [CLEAR] for 2 sec. to add the shift frequency to the operating frequency. 1 ANT USB S Po ALC SWR 1 3 20 5 7 9 50 20 40 60 100% RIT VFOA BLANK 1 1. 5 2 3 CH RIT indications s RIT MONITOR FUNCTION 38 When the RIT function is ON, pushing and holding [XFC] allows you to monitor the operating frequency directly (RIT is temporarily cancelled). FUNCTIONS FOR RECEIVE 5 5-4 AGC function 1 ANT USB The AGC (auto gain control) controls receiver gain to produce a constant audio output level even when the received signal strength is varied by fading, etc. While menu set 1 is displayed, push [F1](AGC) one or more times to select AGC fast or AGC slow. · The corresponding indicator appears in the display. · AGC slow cannot be selected in FM mode. BLANK S Po ALC SWR 1 3 20 5 7 9 50 20 40 60 100% VFOA CH Push [F1](AGC) for 2 sec. to turn the AGC function OFF. · AGC should normally be set to AGC fast for CW and RTTY operation and to AGC slow for SSB and AM operation. · Turn AGC OFF when receiving a very weak signal near a strong signal. 1 1. 5 2 3 P. AMP 1 AGC OFF FS M1 AGC DUP CMP TCN SCP F1 F2 F3 F4 F5 NOTE: When the AGC function is turned OFF, the S-meter does not function. Toggles AGC ON/OFF AGC indicators 5-5 1/4 function 1 ANT CW 1 4 When the 1/4 function is ON, one complete rotation of the tuning dial changes the frequency by 1. 25 kHz (normally one rotation changes the frequency by 5 kHz). This is convenient when critical setting is required and is only available in CW and RTTY modes. S Po ALC SWR 1 3 20 5 7 9 50 20 40 60 100% Push [CW/RTTY] to select CW or RTTY mode. While menu set 1 is selected, push [F3](1/4) to BLANK VFOA CH toggle the 1/4 function ON and OFF. · When the function is ON, "1/4" appears in the function display. to select filter program mode. Push a mode key to select an operating mode for the filter setting. Push [FILTER] to set the filter condition to normal or narrow. · "NAR" appears when narrow is selected. Push [F2](9M) or [F4](455k) one or more times to select a 9 MHz filter or a 455 kHz filter, respectively. Repeat steps to to set filters for other operating modes, if desired. [FILTER] Push [MENU] to return to regular operation. NOTE: See p. 78 for activating the installed optional 9M 455k FIL 2. 4k - 2. 4k F1 F2 F3 F4 F5 filter(s). Selects 9 MHz band filter Selects 455 kHz band filter FIL 9M 455k 2. 4k - 2. 4k 42 FUNCTIONS FOR TRANSMIT 6-1 VOX function 6 The VOX function starts transmission without pushing the transmit switch or PTT switch when you speak into the microphone; then, automatically returns to receive when you stop speaking. This function is available for SSB, AM and FM modes. Before using this function, follow the steps below. Select a phone mode (SSB, AM, FM). Push [VOX/BK-IN] to turn the VOX function ON and OFF. · "VOX" appears when the function is ON. [MENU] [VOX/BK-IN] Tuning dial Push [VOX/BK-IN] for 2 sec. to select VOX program mode. s ADJUSTING THE VOX GAIN VOX VOX Gain 50% F1 F2 F3 F4 F5 Push [F1] or [F2] to select VOX Gain. While speaking into the microphone, rotate the tuning dial to the point where the transceiver is continuously transmitting. · Be careful that sounds other than your voice are not affecting this setting. Push [MENU] or [VOX/BK-IN] to return to menu set 1. Sets item up/down s ADJUSTING THE ANTI-VOX VOX Anti VOX 50% F1 F2 F3 F4 F5 Push [F1] or [F2] to select Anti VOX. While speaking into the microphone, rotate the tuning dial to obtain the most readable signal. Push [MENU] or [VOX/BK-IN] to return to menu set 1. Sets item up/down s ADJUSTING THE VOX DELAY VOX VOX Delay 0. 2s F1 F2 F3 F4 F5 Push [F1] or [F2] to select VOX Delay. Rotate the tuning dial (and speak into the microphone) to obtain a suitable interval for returning to receive after transmitting. Push [MENU] or [VOX/BK-IN] to return to menu set 1. Sets item up/down 43 6 FUNCTIONS FOR TRANSMIT 6-2 Break-in function The break-in function is used in CW mode to automatically toggle the transceiver between transmit and receive when keying. [. . . ] An incorrect transmit frequency is set. Set the proper frequencies into VFO p. 84 A and B or into one of the memory channels. 3 Subaudible tone encoder is OFF and repeater requires a tone for access. Programmed subaudible tone frequency is wrong. [. . . ]