Operations Manual

RF Technology R50 Page 7
2 RECEIVER OPTIONS
2.2 Receiver Low Battery Level
2.2 Receiver Low Battery Level
This is factory set to 24.0V, and defines the level of the DC supply that will cause an
Receiver dc supply low alarm.
2.3 Audio High Pass (Notch) Filter
At the audio output ports, the sub tone (CTCSS) can be notched by a high pass filter,
this high pass filter can be software selected as enable or disable (the filter was
bypassed). The default factory setting is audio high pass filter enable.
2.4 Audio Response
The output audio frequency response can be selected as 750uSec. De-emphasis or flat
response, the default factory setting is 750uSec. De-emphasis.
2.5 LOOP Volts Select
The receiver can key up the transmitter with a DC current between Line+ and Line- of
the audio output terminals. If this option is selected enable, it will be active by the
squelch switch, then a 12Vdc supply is applied to the pair through 660 ohms of source
impedance. If this option is disable, the loop is not used. The default factory setting is
LOOP VOLTS enable.
2.6 COS Polarity Select
The COS (Carrier Operated Switch) can be selected as on with Signal or on with no
Signal. The default factory setting is COS on with Signal.
2.7 COS Source/Sink Select
The COS can be used as a DC source or a free switch, if the Source option is selected,
a 12Vdc voltage will be applied between COS+ and COS- terminals when the COS is
off. The default factory setting is COS Source.
2.8 Channel Selectable Parameters
Each channel defines two complete set of parameters. One set of parameters is used
when a transmitter keys up from the PTT-in input, and the other set is used when the
transmitter keys up from the LOOP-in, the PTT switch, or the microphone PTT input.
Each set defines what frequency to use, what CTCSS sub-tone (if any) to use, what