Icom IC-R20 Instruction Manual - Page 31

BASIC OPERATION 4 ■ Squelch level setting The squelch circuit mutes the received audio signal depending on the signal strength. The receiver has 9 squelch levels, a continuously open setting and an automatic squelch setting. ➥ While pushing and holding [SQL], rotate [R-DIAL] to select the squelch level. • "LEVEL 1" is loose squelch and "LEVEL 9" is tight squelch. • "AUTO" indicates automatic level adjustment with a noise pulse count system. • "OPEN" indicates continuously open setting. [R-DIAL] SQL -DUP TSQL MODE FM ANL AFC 146010 PSKIP √ SQUELCH:AUTO Automatic squelch -DUP TSQL MODE FM ANL AFC 146010 PSKIP √ SQUELCH:LEVEL9 Maximum level ■ Monitor function This function is used to listen to weak signals without disturbing the squelch setting or to open the squelch manually even when mute functions such as the tone squelch are in use. 4 ➥ Push and hold [SQL] to monitor the operating frequency. • The 1st segment of the S-meter blinks. -DUP TSQL AFC MODE FM ANL 146 010 SQL √ PSKIP The 1st segment blinks The [SQL] key can be set to 'sticky' operation in expanded set mode. See page 54 for details. 18