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• When an unprogrammed channel is displayed, the sequential channel number and 

“UNPROGRAMD” are alternately displayed. 

• If an invalid channel number is entered using the 0-9 keys, or the Channel Select option 

switch is pressed with “UNPROGRAMD” displayed, an error tones sounds, 
“INVALID” is briefly displayed, and the displayed channel does not change.

This radio does not have a squelch control. The squelch level is preset and usually does not 
require readjustment. However, if the squelch level needs to be changed on a conventional 
analog channel, it can be changed using keypad programming if available (see Section 
5.17 on page 36).

Transmitting can be disabled on each conventional, SMARTNET, SmartZone, and P25 
Trunked channel so that the channel is monitor-only. When transmitting is attempted on a 
receive-only channel, “RX ONLY” is displayed and an error tone sounds.

Each selectable channel can be programmed for the conventional (analog or Project 25 
digital), SMARTNET/SmartZone, or Project 25 digital trunked operating mode. For 
example, Zone 1/Channel 1 could be a conventional channel, Zone 1/Channel 2 a 
SMARTNET channel, and so on. More information on these modes follows.

This is a non-trunked operating mode which accesses independent radio channels. There is 
no automatic access to several channels. Selecting a conventional channel selects a 
transmit and receive frequency and other channel parameters such as squelch control 
coding.