Vertex VXR-5000 User Manual page 15

DC
V
buffered by an internal op-amp. Typical
voltages are graphed as follows:
S-Meter Output Proportional Voltage Graph
9.
COAX SW
Logic Output (Active Low)
This output is intended for controlling an
external coaxial switching relay. It is an
open collector output which can sink ap-
prox. 100 rnA when active. This signal only
switches if the repeater has been pro-
grammed for simplex mode. If pro-
grammed for duplex, the signal remains
open (at high impedance) at all times.
10.
NSQ OFF
Logic Input (Active Low)
This input is internally pulled up to 5-V
DC When pulled low by an external de-
vice, receiver squelch is canceled. If the
internal CTCSS decoder is programmed,
pin 17 (TONE OFF) should also be pulled
low during monitoring. If the repeater is in
the REPEATER mode, the transmitter is
not keyed when this pin is activated, but
an incoming signal on the receiver channel
does
cause the transmitter to be keyed and
the signal repeated as normal. Do not ap-
ply more than 5 V to this pin, as this can
damage the CNTL-1 Unit CPU.
11.
NSQ DET
Logic Output (Active Low)
This is an open-collector, active-low out-
put capable of sinking about 100 rnA. It
indicates that the receiver squelch is open.
If the squelch control is properly set, this
indicates a carrier on the receiver channel,
and is sometimes referred to as a COR
(Carrier Operated Relay) signal. Some tele-
phone interconnect panels and commu-
nity repeater tone panels require this
signal.
Instruction Manual
VXR-5000
12. PIT Logic Input (Active Low)
This input is internally pulled up to 5-V
DC When pulled low by an external de-
vice, it keys the repeater transmitter, pro-
vided that the
BASE
signal is present on
pin 13 (indicating the repeater is in the
base mode of operation). The pin has no
effect if the BASE signal on pin 13 is not
present (Le. the REPEATER mode is se-
lected). Avoid voltage in excess of 5 Von
this pin, or internal damage to the CPU on
the repeater CNTL-1 unit may result.
13.
BASE
Logic Input (Active Low)
This input is internally pulled up to 5-V
DC In simplex mode, this pin is not nor-
mally used. However, after programming
via CE-8 Software and pulled low by an
external device, BASE or REPEATER
modes of operation can be selected. In
BASE mode, the receiver and transmitter
operate independently: receiver signals do
not key the transmitter. In the alternate
(REPEATER) mode, a proper signal on the
receive channel causes the transmitter to
be keyed and modulated by receiver
audio. A void voltage in excess of 5 V on
this pin or internal damage to the CPU on
the repeater CNTL-1 unit may result.
14.
GND
This is the chassis ground for all logic lev-
els and power supply return, and is also
common with pin 1. Do not connect to pin
7 (A GND), which should only be used for
grounding of analog signals.
15.
DCS IN
Digital Input for
Des /
LTR data
This pin accepts sub-audible tones in the
range of 6 - 136 Hz for modulation of the
transmitter with DCS or LTR data. Internal
buffering allows the data to be DC refer-
enced from 5-9 VDC Signals below 2.5 V
are transmitted as Logic "0" while levels
above 2.5 V are Logic "I". Voltage in ex-
cess of 9 V may cause internal damage.
16.
TONE DET
Logic Output (Active Low)
This open-collector output can sink about
100 rnA, and is activated when the internal
CTCSS detects a valid CTCSS tone at the
demod ula tor.
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