Long Tone Zero (LiTZ)

LiTZ is a simple method to indicate to others on an amateur VHF / UHF FM radio frequency that you have an immediate need to communicate with someone, anyone, regarding a priority situation or condition.

LiTZ stands for Long Tone Zero (i-added to make it easier to pronounce). The LiTZ signal consists of transmitting DTMF ZERO for at least 3 seconds. After sending the LiTZ signal, the node executes a pre-programmed DTMF control sequence.

The parameters for setting the command string, for overriding the default DTMF tone for LITZ mode, and the required time for activation are as follows:

litzchar = 0     ; DTMF character required to initiate the LiTZ feature (default is 0)
litzcmd = *6911  ; Command sequence to execute upon LiTZ activation -- Call 911 on autopatch (default is not set)
litztime = 3000  ; Time required to hold down DTMF (default is 3000mS)

The above options would be placed in the node's configuration stanza in rpt.conf.

By default, litzcmd is not set (blank), which disables the feature (as even if a user sends litzchar for litztime, there is nothing to execute).