Kantronics KPC-2 - Page 26

KPC-4
-
AFSK
Output
-
Jumpers
K3
and
K4
These
jumpers
are
provided
to
alter
the
AFSK
output
level.
The
KPC-4
is
shipped
from
the
factory
with
the
jumpers
in
the
LO
position.
The
LO
position
sets
an
AFSK
output
level
from
the
KPC-4
at
10
mV.
The
HI
position
sets
an
AFSK
output
level
of
50
mV.
Both levels are peak-to-peak
microphone will also require
jumper entirely will provide
values.
In
general,
transceivers
requiring
a
pre-amplified
the
HI
level
AFSK
output
from
the
KPC-4.
Removing
the
the
maximum
possible
output
level
of
approximately
1.7
volts.
Should
you
require
an
intermediate
value
of
AFSK
modulation
signal,
it
may
be
obtained
by
replacing
resistor
R23
or
R29
with
the
appropriate
value
chosen
from
the
following
chart.
If
you
change
resistors
to
obtain
an
intermediate
value,
place
the
appropriate
jumper
in
the
HIGH
position.
K3 K4
R23
Value
R29
Value
AFSK
Output
Level
470
ohms
470
ohms
24
mV
2.2
Kohms
2.2
Kohms
106
mV
6.8
Kohms
6.8
Kohms
290
mV
22
Kohms
22
Kohms
680
mV
47
Kohms
47
Kohms
1000
mV
KPC-2
-
AFSK
Output
-
Jumper
K1
1220-1
-
AFSK
Output
-
Jumper
K3
This
jumper
is
provided
to
alter
the
AFSK
output
level.
The
TNC
is
shipped
with
this
jumper
in
the
high
position.
In
the
high
position
output
level
is
21
mV
P/P.
In
the
low
position
output
is
4.5
m
V
P/P.
If
a
higher
output
level
is
required
for
your
radio
it
may
be
obtained
by
changing
the
resistor
(R14
in
KPC-2,
R37
in
KPC-1).
The
chart
below
gives
the
output
levels
for
different
values
of
the
resistor
with
the
jumper
in
the
HI
position.
:
KPC-2 KPC-1
R14
value
R37
value
AFSK
level
100
ohm
100
ohm
4.5
mV
220
ohm
220
ohm
10
mV
470
ohm
470
ohm
21
mV
1K
1K
44
mV
15K
15K
65
mV
2.2
K
2.2K
94
mV
8.2
K
8.2
K
298
m
Should
you
require
a
still
higher
AFSK
output
level
the
value
of
the
resistor
may
be
increased
further
to
provide
incremental
increases
in
the
same
approximate
ratio
as
that
shown
in
the
table.
For
maximum
output
level
the
HI
LO
jumper
can
be
removed
entirely.
In
this
case
AFSK
output
level
will
be
approximately
1.5
volts
peak-to-peak.
20 AFSK OUTPUT LEVEL
Version 2.85
Installation Manual
ä —
©
Copyright
1989,
Kantronics,
Inc.
All
Rights
Reserved.
Duplication
of
this
manual
or
the
firnware
without
permission
of
Kantronics,
Inc.
is
prohibited.