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Heathkit HM-2102 - Page 17

Heathkit HM-2102
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Page
14
(_
)
Connect
the
CALIBRATION
JUMPER
on
the
remote
chassis
circuit
board
to
the
CAL
pin.
(See
Figure
3
fold-out
from
this
page.)
(_)
Turn
on
the
transmitter
and
set
it
to
the
CW
mode
in
the
6
or
2-meter
band.
Then
tune
the
transmitter
and
watch
the
RF
Power
Meter
needle
move
up-scale.
If
the
meter
needle
does
not
move
up-scale,
refer
to
the
“In
Case
of
Difficulty”
section
of
this
Manual.
SWR
BALANCE
ADJUSTMENT
(
)
Set
the
FUNCTION
switch
to
SWR.
(
)
Apply
transmitter
power
and
adjust
the
SWR
SENS
control
for
a
midscale
reading.
(
)
Refer
to
Figure
3
and
adjust
SWR
NULL
ttimmer
C4
on
the
circuit
board
for
the
best
null
or
greatest
dip
of
the
meter
needle.
This
reading
should
be
at
or
near
zero.
NOTE:
Use
only
the
alignment
tool
(nut
starter)
for
this
adjustment.
(
)
Readjust
the
SWR
SENS
controj
for
a
maximum
reading.
(
)
Repeat
the
two
preceding
steps.
Make
these
final
adjustments
carefully
and
precisely.
The
accuracy
of
the
instrument
depends
on
a
well
balanced
bridge
circuit.
{
)
Pull
the
SWR
SENS
knob
to
its
out
position.
Then
set
SWR
SENS
control
for
a
full-scale
reading.
(_)
Push
the
switch
in
and
note
the
meter
reading.
If
the
meter
reads
higher
than
1.5,
refer
to
the
‘In
Case
of
Difficulty”
section
of
the
Manual.
POWER
METER
CALIBRATION
The
internal
calibration
circuit
may
be
used
for
calibration
with
5-watt
to
15-watt
transmitterson
the
2-meter
(6-meter,
if
C2
is
14
pF)
band.
An
external
wattmeter
may
be
used
with
transmitters
at
frequencies
of
50
to
160
MHz
and
power
up
to
200
watts.
(The
internal
calibration
circuit
is
not
used
in
this
case.)
HHATHEIT®
Either
procedure
will
give
accurate
results
over
the
full
range
specified
for
your
Wattmeter.
However,
the
accuracy
of
the
external
wattmeter
will
determine
how
accurate
your
Wattmeter
will
be.
Use
only
one
of
the
two
following
procedures.
Internal
Calibration
1.
(
)
Turn
the
FUNCTION
switch
to
25.
2.
(
)
Connect
the
CALIBRATE
Jumper
on
the
circuit
board
to
the
CAL
pin.
3.
(
)
Tune
the
transmitter
on
the
2-
(or
6-)
meter
band.
Note
the
meter
reading.
Connect
the
CALIBRATE
jumper
to
the
NORM
pin
and
adjust
POWER
CALIBRATE
control
R6é
with
the
alignment
too]
so
the
meter
reads
the
same
as
noted
instep
4.
6.
(
)
Repeat
steps
2,
4,
and
5
until
the
meter
readings
for
both
CAL
and
NORM
connections
are
the
same.
7.
(
)
Connect
the
CALIBRATE
jumper
to
the
NORM
pin.
This
completes
the
“Internal
Calibration’
of
your
VHF
Wattmeter.
External
Calibration
(
)
Connect
the
external
wattmeter.
(
)
Turn
the
FUNCTION
switch
to
25.
(
)
Tune
the
transmitter
on
the
2-meter
(or
6-meter)
band.
(
)
Note
the
external
wattmeter
reading.
(_
)
Connect
the
calibrate
jumper
to
the
NORM
pin
and
adjust
POWER
CALIBRATE
control
R6
so
both
meters
read
the
same.
This
completes
the
“External
Calibration’’
of
your
VHF
Wattmeter.

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