User manual ICOM IC-718

[. . . ] INSTRUCTION MANUAL HF ALL BAND TRANSCEIVER i718 This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. IMPORTANT READ THIS INSTRUCTION MANUAL CAREFULLY before attempting to operate the transceiver. EXPLICIT DEFINITIONS WORD R WARNING CAUTION NOTE DEFINITION Personal injury, fire hazard or electric shock may occur. No risk of personal injury, fire or electric shock. SAVE THIS INSTRUCTION MANUAL. This manual contains important safety and operating instructions for the IC-718. PRECAUTIONS R WARNING HIGH VOLTAGE! [. . . ] In such cases, reduce the microphone gain (see above). Indicates the SWR over the transmission line. ALC SWR 26 RECEIVE AND TRANSMIT 5 ï Microphone compressor IC-718 has a built-in, low distortion Mic compressor circuit. This circuit increases your average talk power in SSB mode and is especially useful for DX'ing when the receiving station is having difficulty copying your signal. w Select the mic gain display in quick set mode. · Push [SET] for 1 sec. · Push [ UP]/[ DN] one or more times to select "MIC GAIN". [COMP] switch e Adjust the mic gain by rotating the main [DIAL]. · While transmitting at your normal voice level, the ALC meter should read at about the middle of the ALC zone. · Be sure the mic gain is in the range of 20 to 50. r Push [SET] to exit the quick set mode. t Push [COMP] to turn mic compressor ON. y Push [SET] one or more times to select the ALC meter. u While speaking into the microphone at a normal voice level, confirm the ALC level so that the ALC meter peak does not past the ALC zone. · If the ALC meter peak past the ALC zone, re-adjust the mic. gain. ALC zone Adjust [MIC GAIN] so that the ALC meter reads within the ALC zone. Note: When the ALC meter peaks above the ALC zone, your transmited voice may be distorted. ï VOX operation The VOX (Voice-operated Transmission) function toggles between transmit and receive with your voice. This function provides an opportunity to input log entries into your computer, etc. w Select "VOX Gain" in quick set mode. · Push [SET] for 1 sec. · Push [ UP]/[ DN] one or more times to select "VOX GAIN" [VOX] switch e While speaking into the microphone, adjust [VOX GAIN] until the transceiver is transmitting. r Select "VOX Delay" in quick set mode. · Push [ UP]/[ DN] one or more times to select "VOX Delay" t While speaking into the microphone, adjust [VOX DELAY] as desired. y Select "ANTI-VOX" in quick set mode. · Push [ UP]/[ DN] one or more times to select "AN VOX" u If the receive audio from the speaker toggles the transceiver to transmit during receive, adjust the "ANTI-VOX" to the point where it has no effect. i Push [SET] to exit the quick set mode. 27 5 RECEIVE AND TRANSMIT ï Optional AT-180 AUTOMATIC ANTENNA TUNER operation The AT-180 automatic antenna tuner matches the IC718 to the connected antenna automatically. Once the tuner matches an antenna, the variable capacitor angles are memorized as a preset point for each frequency range (100 kHz steps). Therefore, when you change the frequency range, the variable capacitors are automatically preset to the memorized point. · MANUAL TUNING During SSB operation on HF bands at low voice levels, the AT-180 may not be tuned correctly. In such cases, manual tuning is helpful. to start manual tuning. · CW mode is selected, a side tone is emitted, and " " blinks; then, the previous mode is selected. CAUTION: NEVER transmit with the tuner ON when no antenna is connected. [. . . ] (R 21) The transceiver has been thoroughly tested and adjusted at the factory before being shipped. The transceiver warranty does not cover any problems caused by unauthorized internal adjustment. Final ID adj. (R 24) Final amplifier (2SC2094x2) Fuse (FGB 4 A) PA unit R 25 FILTER unit I Bottom view Carrier suppression adj. (C 16) Optional crystal (CR-338) PLL unit Optional IF filter (See p. [. . . ]