Icom IC-78 Instruction Manual - Page 17

4 OPERATION s Basic voice receive and transmit q Check the following in advance: ¯ Microphone is connected. ¯ [AF] control is set to minimum position. ¯ [RF/SQL] is set to center position (squelch open). ¯ [RIT] control set to center position. [RIT] [AF] Microphone [RF/SQL] connector w Selects the desired channel to be received with the channel selector, [√ DN]/[UP ∫], or 10-key pad. • The S-meter shows signal strength when signal is received. e Adjust [AF] to the desired audio level when receiving a signal. r Push [MODE] to select the desired operation mode, if the received signal is in a different mode. t If the bass or treble of the receive audio is too strong, rotate [RIT] control to obtain clear audio. (p. 19) y Push [TUNER] to tune the antenna tuner, if connected. • "TUNE" indicator flashes for 1 to 2 sec. for the first tun- ing on a channel. u Push and hold [PTT] on the microphone, and speak into the microphone at a normal voice level. • The RF meter shows the output power according to your voice level, when RF power meter is selected. i Release [PTT] to return to receive. s Mode selection The following modes are available in the IC-78: SSB (LSB/USB), CW, CW REV (CW reverse), RTTY, RTTY REV (RTTY reverse) and AM. ¯ Push [MODE] to select desired operation mode. ¯ Push [MODE] for 1 sec. to change between USB and LSB, CW and CW reverse or RTTY and RTTY reverse. (SSB, CW and RTTY mode only) • The selected mode is indicated in the function display. Note: The selected mode can be used for temporary operation only. OPERATING MODE SELECTION USB CW RTTY LSB CW RTTY AM MODE Push momentarily MODE Push for 1 sec. s RF gain and Squelch The [RF/SQL] control adjusts either the RF gain or the squelch. The action depends on the operating mode and the condition of the RF/SQL item in initial set mode (p. 31). • [RF/SQL] control priority Set mode setting SSB, CW, RTTY AM • When set as the [RF/SQL] control Maximum RF gain Squelch is open. S-meter squelch threshold RF gain adjustable range S-meter squelch rS (RF/SQL) RF/SQL RF/SQL At (Auto) RF gain SQL* Sq (SQL) (default) SQL* SQL* * The RF gain is set to maximum level when the [RF/SQL] is set as [SQL] control. The RF gain is used to adjust the receiver gain. • Shallow rotation moves the S-meter to the right indicating the signal strength which can be received. • When set as the [SQL] control Squelch is open. S-meter squelch threshold S-meter squelch Shallow Deep • When set as the [RF] control The recommended position for RF gain is the 12 Maximum RF gain o'clock position since this sets RF gain to the max. The SQUELCH removes noise output from the Adjustable range speaker (closed condition) when no signal is received. The squelch is available for the other modes. Minimum RF gain • A segment appears in the S-meter to indicate the S-meter squelch level. 15