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Long Tone Zero (LiTZ) Protocol

Posted: Tue Mar 11, 2008 11:46 pm
by OLLIE
LiTZ is a simple method to indicate to others on an amateur VHF/UHF FM radio channel that you have an immediate need to communicate with someone, anyone, regarding a priority situation or condition.

LiTZ stands for LONG TONE ZERO. The LiTZ signal consists of transmitting DTMF (Touch-Tone) ZERO for at least 3 seconds. After sending the LiTZ signal the operator announces by voice the kind of assistance that is needed. For example: (5-seconds-DTMF-zero) "This is KA7BCD. I'm on Interstate 5 between mile posts 154 and 155. There's a 3 car auto accident in the southbound lane. Traffic has been completely blocked. It looks like paramedics will be needed for victims. Please respond if you can contact authorities for help. This is KA7BCD.

If your situation does not involve safety of life or property, try giving a general voice call before using LiTZ. Use LiTZ only when your voice calls go unanswered or the people who respond can't help you.

When you see the notation "LiTZ" for a repeater in this directory that means that it's highly likely that someone will receive and respond to LiTZ signals transmitted on the input frequency of the repeater. Please note, however, that if a CTCSS tone is needed to access that repeater you should transmit that CTCSS tone along with your LiTZ signal.

The type and nature of calls that justify the use of LiTZ may vary from repeater to repeater, just as other
LiTZ is a simple method to indicate to others on an amateur VHF/UHF FM radio channel that you have an immediate need to communicate with someone, anyone, regarding a priority situation or condition.

Here are some general guidelines that may be suitable for most repeaters and simplex calling channels.

(Information exctracted from: http://vaxxine.com/va3nag/tecnotes/refe ... ote32.html)

Re: Long Tone Zero (LiTZ) Protocol

Posted: Thu Mar 27, 2008 10:14 pm
by toms
Was the duplicate text for emphasis?

Re: Long Tone Zero (LiTZ) Protocol

Posted: Tue Apr 08, 2008 10:11 pm
by OLLIE
toms wrote:Was the duplicate text for emphasis?
Thanks... Fixed it. :D