Carrier-Operated-Switch - ACC RC-96 Owner's Manual

Touch-Tone Pad Test
Carrier-Operated­
Switch
Chapter Two: Hookup to Your Repeater
Plug in an 8 ohm speaker into the external speaker jack on the
rear panel and supply 12 volts to the unit (see "Power" above).
The '96 will "wake up" and all the front panel LEDs will light up
momentarily (on units with a front panel display). The "Power"
indicator will stay lit and the '96 will say, "RC-96 Repeater
Controller, Vx.x." While the t96 is talking, adjust the volume to
a comfortable listening level using the volume control knob. The
volume is fIXed on units without the front panel display. Before
you begin programming, do a Touch-Tone pad test by pressing
5 (any sequence of keys) #
.The Sis the Touch-Tone pad test prefIX and the # key acts as an
. enter key. The "DTMF'indicator will light up to verify that the
tones are being decoded as each key is pressed. The controller
will respond by saying the sequence of keys you entered. If the
'96 does not respond,double checkthe power and speaker
connections. Once you have verified that the Touch-Tone pad
works, you can begin programming. See Chapter 6 - "Program ­
ming the Controller", for further details. Or you can wait until
the controller is installed in your repeater and program the
controller remotely.
The output from the receiver which indicates that a signal is
present is called COS, or carrier-operated-switch. It's a logic
signal which is at a particular logic state when an RF signal is at
the receiver's input, or the squelch is open, and at the opposite
state when there is no RF signal and the squelch is closed. Most
receivers designed for repeater service have such a logic output,
called "COS", "COR", "squelch gate", or something similar.
With other receivers, such as transceivers put into repeater ser ­
vice, it's necessary to find a usable logic signal for COS. Look
after the FM detector, following the noise amplifier and rectifier
in the squelch circuit, for a usable .signal. Contact
L~e
receiver's
manufacturer if you need help with your particular receiver.
Since COS signals from different receivers can vary in character ­
istics, the RC-96 controller is designed to accept a variety of
logic levels and to accept "high true" and "low true" signals.
The only requirements are that a logic low
be
less than 0.8 volts
and a logic high be greater than 2.4 volts (up to about 15 volts).
The COS input high impedance is approximately 10K ohms, so it
isn't likely that it will load down the circuitry providing the COS
signal. A DIP switch accessible from the rear allows selection of
high or low true, based on what your receiver provides. For a
high true COS, set DIP switch ION; for low true COS, set it
OFF.
RC-96 REPEATER CONTROLLER OWNER'S MANUAL· 9