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Heathkit HW-12 - Page 41

Heathkit HW-12
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HEATHEIT
i+—
EEE
career
er
—
no
«
,
a
ES
TREE
FRE
SR
FP
ES
EF
SS
EN
TE
EE
ET
en
reer
Turn
the
FUNCTION
switch
to
PTT.
The
pilot
lamps
and
the
tube
filaments
should
light,
Watch
to
see
that
the
meter
remains
at
zero;
if
it
should
start
to
deflect,
the
Transceiver
should
be
turned
off
immed-
iately,
as
the
bias
circuit
of
tube
stages
V6
and’V7
is
probably
shorted
and
must
be
cor-
recied
before
proceeding.
Place
the
Meter
switch
in
the
OPERATE
TUNE
position
and
adjust
the
S
METER
ADJ
control
for
a
zero
indication
on
the
meter,
Remove
the
dummy
load
from
the
ANT
annalenat
and
SVYULACL
socket,
plug
an
antenna
into
the
ANT
Turn
up
the
AF
GAIN
control
until
noise
is
heard
in
the
speaker,
Tune
up
and
down
the
band
with
the
VFO.
Stations
should
be
heard
w
tneal
aatisritey
any
s0Cal
ACLIVILTY,
Adjust
the
top
and
bottom
slugs
of
re-
ceiver
IF
transformer
T3
for
the
hiehest
P
r
or
the
highest
meter
reading,
Use
the
Short
end
of
the
alignment
tool
for
the
ton
slug,
and
the
long
end
of
the
alignment
tool
for
the
bottom
slug,
When
passing
the
long
end
of
the
alignment
tool
through
the
top
slug
to
reach
the
bottom
slug,
be
careful
not
to
disturb
the
adiustment
of
the
top
slug,
—
Repeat
the
adjustment
of
T3
for
the
highest
meter
reading,
Turn
the
FUNCTION
switch
to
OFF.
Turn
the
VFO
dial
fully
counterclockwise
‘until
the
plates
of
the
VFO
capacitor
are
fully
closed,
Rotate
the
calibrated
dial
so
that
the
end
of
the
white
stripe
near
the
marking
is
aligned
with
the
hairline
and
tighten
the
setscrew,
Check
to
see
that
full
rotation
of
the
dial
does
not
cause
any
drag
or
rubbing,
If
it
does,
move
the
dial
or
knob
slightly
on
the
shaft,
then
recalibrate
and
retighten
the
seiscrew,
Bend
the
pilot
lamp
bracket
and
adjust
the
lamp
positions
for
best
illumination
of
the
dial
and
meter.
Page
41
VFO
CALIBRATION
Disconnect
the
antennafrom
the
Transceiver
and
plug
the
dummy
load
into
the
ANT
socket,
Following
are
two
ways
in
which
tocheck
the
dial
calibration
with
two
different
types
of
receivers,
Use
the
method
that
applies
to
the
type
of
re-
ceiver
available,
,
CALIBRATION
WITH
ASTANDARD
AM
BROAD-
CAST
RECEIVER
i.
Connect
one
end
of
a
short
wire
tothe
antenna
terminal
of
the
receiver.
Place
the
other
end
of
this
wire
near
tube
Vid
in
the
Trans-
ceiver,
2.
Set
the
receiver
dial
to,
J495
ke
and
the
2A
8
ay
fe
ter
£84
§
VFO
dial
to
36.
f,4
3.
Set
the
FUNCTION
switch
to
PTT
andallow.
the
Transceiver
to
warm
up,
4.
Adjust
the
slug
of
coil
L5
until
a
whistle
is
heard
in
the
speaker
of
the
receiver.
Coil
L5
will
normally
have
to
be
turned
in
a
counterclockwise
direction,
viewed
from
the
top
of
the
chassis,
5.
If
this
portion
of
the
AM
band
has
too
much
noise,
set
the
receiver
dial
at-1695
kc
and
7
YEG
the
Transceiver
dial
at
4.0.
Then
repeat
the
adjustment
of
L5,
Trimmer
C131B
neednot
be
adjusted
at
this
time.
6,
Turn
the
FUNCTION
switch
to
OFF.
This
alignment
should
provide
fairly
close
calibration
of
the
VFO.
However,
operation
of
the
Transceiver
near
the
ends
of
the
VFO
dial
should
be
avoided
until
the
VFO
calibration
is
checked
With
a
crystal
calibrator
or
avery
accu-
rate
amateur
receiver,
CALIBRATION
WITH
AMATEUR
BAND
Pt
Pol
tetas
ab
ey
1,
Connect
one
end
of
a
short
wire
to
the
antenna
terminal
of
the
receiver,
Place
the
other
end
of
this
wire
near
tube
V4
in
the
Transceiver,
2,
Temporarily
remove
V5,
the
12BY7
tube.
3.
Turn
the
FUNCTION
switch
to
TUNE
and
allow
the
Transceiver
to
warm
up.

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