VX-6R OPERATING MANUAL 23ADVANCED OPERATIONRF SQUELCHA special RF Squelch feature is provided on this radio. This feature allows you to set thesquelch so that only signals exceeding a certain S-meter level will open the squelch.To set up the RF squelch circuit for operation, use the following procedure:1. Press the [F/W] key, then press the [0(SET)] key to enter the Set mode.2. Rotate the DIAL knob to select Set Mode Item 50: RF SQL.3. Press the [0(SET)] key momentarily to enable adjustment of thisItem.4. Rotate the DIAL knob to select the desired signal strength levelfor the squelch threshold (S1, S2, S3, S4, S5, S6, S7, S8, S9,S9+, or OFF).5. Press the PTT switch to save the new setting and return to normal operation.CHECKING THE BATTERY VOLTAGEThe VX-6R’s microprocessor includes programming which will measure the current bat-tery voltage.1. Press the [F/W] key, then press the [0(SET)] key to enter the Set mode.2. Rotate the DIAL knob to select Set Mode Item 16: DC VLT.3. Press the [0(SET)] key momentarily to display the current DCvoltage being supplied.Lit: FNB-80LI is in use.Edc: An external DC source is in use.4. Press and hold in the [0(SET)] key for 2 seconds to return tonormal operation.