Talking S-Meter; Control Receiver - ACC RC-85 Owner's Manual

RC-85 Repeater Controller Owner's Manual

Talking S-Meter

The controller is capable of measuring a 0-5 volt S-meter signal and reading
back the measurement to the user in synthesized speech on command. The
signal should be conditioned if necessary to range from zero volts (S0) to
approximately five volts (S9 plus 60) and should drive connector J4 pin 4. The
signal may range between zero and twelve volts without damaging the
controller.
As an example, the diagram below shows connection of a Spectrum
Communcations SCR-200 S-meter signal output to the RC-85 controller. The
meter should be disconnected and a 10K resistor placed from the signal output to
ground. The signal may drive the controller directly. The resistor divides down
the S-meter signal to an approximately zero to five volt range and also provides
a discharge path for the emitter follower transistor in the receiver's S-meter
circuit.

Control Receiver

An independent receiver may function as a control receiver and have command
priority over other command channels in the system (repeater receiver and
phone). The control receiver audio may connect to the Audio Connector J4 pin 5
and should be in the range of .5 to 2.5 volts peak-to-peak.
The COS signal should connect to the Logic Connector J3 pin 3. The COS may
be high true or low true - DIP switch 3 should be set based on its logic sense -
ON for high true, OFF for low true. If a control receiver is not connected, DIP
switch 3 must be ON.
For greater security, a PL decode signal from the control receiver can replace the
COS signal. PL would need to be transmitted on the control channel to activate
the control receiver function.
(Interfacing to Other Equipment) 8 - 3 V3 4/87