For assistance, call RITRON at 800-872-1872, or go to
www.ritron.com
5
Compand
Some two-way radios have a feature referred to as
“companding”. It is a way of eliminating background
hiss or noise, making the radio sound clearer.
“Companding” is a combination of audio “compression”
in the transmitter and audio “expanding” in the receiver.
The Quick Talk
TM
can be programmed for audio
compression. To determine if your existing 2-way radios
are using the Companding feature, you can check the
radio’s User Manual, contact your radio dealer, or call
Ritron for help.
If you are unable to determine if your portable radio
uses the companding feature, we suggest the following:
1. Leave the radio in the factory default setting with
no companding.
2. Activate the transmitter of the Quick Talk
TM
and
listen to the message from your portable radio. If
the received audio is acceptable, you should not
need to set the Quick Talk
TM
for companding.
Input Type
Each input can be programmed for one of the three (3)
basic types of Input operation.
Contact Closure
– Is used when a switch closure is
connected to the input.
Analog Input –
Voltages above the High Threshold
Setpoint cause the Input OPEN message to transmit.
Voltages below the Low Threshold Setpoint cause the
Input CLOSED message to transmit. The dead zone—
an area of hysteresis provided by the difference
between High and Low Threshold Setpoints—prevents
unwanted messages caused by noise or minor signal
changes. See Fig—9.
When the input is in CLOSED condition, a change to
OPEN condition occurs only when the signal exceeds
the High Threshold Setpoint. Similarly, when the input is
in OPEN condition, the change to CLOSED condition
occurs only when the signal is less than the Low
Threshold Setpoint.
Terminated Alarm Input -
This mode is useful in
security alarm applications, where the “Secure” (Good)
condition is a range of voltages. Any voltage above or
below this range represents an “Alarm” (Bad) condition.
See Fig—10.
The “Secure” condition is the range of voltage between
the High and Low Threshold Setpoints. The input OPEN
message is activated in this range. Voltage above High
Threshold Setpoint, or below Low Threshold Setpoint
activates the input CLOSED message.
Analog Setpoints -
The HIGH and LOW Threshold
Setpoints used when the Input is set to Analog Input
mode or Terminated Alarm Input mode can be
programmed to any DC voltage between 0-5 VDC. The
Analog Setpoints have no effect when the Input is set to
Contact Closure mode.
Input Operation
Normal –
operation transmits a message each time a
changed condition is detected.
Debounce Mode -
is an option specifying that the
switch must remain in it’s changed condition for the
programmed debounce time before generating a
message for the changed condition.
Example: A sensor is used to detect a car in a “No
Parking” zone. Since it is undesirable for a message to
be generated by normal traffic through the “No Parking”
zone, a five-minute Debounce is used. Only if the
sensor is activated for a full five minutes will the “car
illegally parked” message be transmitted.
Holdoff Mode -
option transmits messages immediately
upon a change of switch condition, and will hold off a
message indicating further change for the programmed
holdoff time.
Example: A Quick Talk
TM
is used as a gate doorbell. It
is practical for the message to be transmitted
immediately, and also desirable to have a one-minute
holdoff before the same message is re-sent, even if the
button is pushed repeatedly.
Debounce / Holdoff Time –
specifies the debounce
time or holdoff time described above. This time is
programmed independently for the OPEN and CLOSED
conditions.
