RXC-3080
Hardware Installation and User Guide
9000-0000-042 Revision 06
34 of 45
Genave Electronics
When setting up and programming the RXC-3080 to detect Two Tone Sequential tones, make certain
that you have the correct tone frequencies AND the correct tone lengths for both tones. The RXC-3080
has the ability to learn tones over-the-air. However, if the tone lengths vary significantly from the
activation point over time or if the tones are generated by hand, the RXC-3080 may not decode them
properly.
Here are some reference points for Two Tone sequential tones:
Front Porch
= Key up time. This is the time required for the transmitter to become stable. This is not a
problem with new transmitters, but if the signal is passing through several different pathways to get to
the RXC-3080 it may get delayed by up to 250 milliseconds. If not calculated into the A tone time, this
would make the A tone appear too short.
Tone A Time
= Length of time that the first tone is being transmitted. This time may be as short at 700
milliseconds or as long as 25 seconds.
Inter-tone Gap
= The amount of time when neither A or B tones are transmitted. Normally this is 0
seconds for most systems. The maximum allowed time for the RXC-3080 is 300 milliseconds
Tone B Time
= Length of time that the first tone is being transmitted. This time may be as short at 700
milliseconds or as long as 25 seconds.
Back Porch
= Length of time that the transmitter is still operating but no tones are being transmitted.
It is recommended that this time be at least one second when transmitting stacked pages.
Note: The Inter-tone Gap is NOT the same as the Inter-sequence gap. This is the time between a set of
tones and the next set of tones. The Inter-sequence time is normally 1 second in length to allow
decoders time to start working on the first set of tones before another set comes in.
Illustration 2: Two Tone Sequential Map
