1402MAN.TXT
TERMINAL HOOKUP GUIDE
NOTE: All identifier terminals are referenced to ground
potential and all voltage measurements are made with
respect to ground (TB1-4).
POWER (TB1-1 and TB1-2)
Power of 8-25 volts AC/DC should be applied between terminals
TB1-1 and TB1-2 or to the power connector. These terminals
connect to a full wave bridge rectifier so the power connections
are not sensitive to polarity.
The optional 120 VAC ("T" option) wall plug transformer should be
plugged into the power jack or connected between terminals TB1-1
and TB1-2.
RECEIVER COR MONITOR (TB1-3):
This terminal has the purpose of inhibiting or delaying the
identifier from keying the transmitter until such a time that
there is no other traffic on the channel. Generally, this
terminal is connected to the receiver squelch circuit* in such a
fashion that a "digital low" (less than 1.2 VDC) applied to the
COR terminal indicates that there is traffic on the received
frequency, and the identifier will remain quiet until the voltage
resumes to a "digital high" (more than 3.5 VDC), indicating that
the channel is cleared of traffic. Some receivers have an
"active high" squelch voltage, where a "digital high" means the
channel is busy and a "digital low" means the channel is clear.
In this situation, switch SW3-1 may be used to invert the level
of this terminal. See "Option D's Audio Monitor" for further
information regarding COR hookups.
*
May go to a "channel busy" light circuit if this is available
and electrically compatible.
GROUND (TB1-4):
Chassis ground and common for the Transmitter Monitor,
Transmitter Keying and Receiver Monitor terminals is TB1-4. This
terminal may also be used as power ground if the 1402 is to
operate off the base station's power.
TRANSMITTER KEYING (TB1-5):
This is the terminal that is used to automatically key the
transmitter while identification is taking place. The
transistorized terminal is capable of switching a 200 MA load (up
to +200 VDC open circuit) to ground. It cannot switch AC and it
cannot switch anything that is not "ground seeking". For these
applications, the "D" option must be used.
Whether the transistor or relay is used, the connection is made
at the push-to-talk (PTT) line of the transmitter.
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