Ritron RIT32-151 用户手册

 

 

 

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.  

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 
Contact Closure mode. 
 

Normal – operation transmits a message each time a 
changed condition is detected. 

Debounce Mode - is an option specifying that the 
switch must remain in its 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.