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.
1-13
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