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Heathkit HW-12 - Receiver Alignment

Heathkit HW-12
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POWER
SUPPLY
SOURCE
CURRENT
CONSIDERATIONS
NOTE:
The
information
in
this
section
does
not
apply
to
the
Heath
Models
HP-13
and
HP-23
Power
Supplies.
When
using
an
AC
power
supply
where
primary
current
is
of
little
concern,
or
when
the
Trans-
ceiver
is
used
with
a
linear
amplifier,
the
small
OPTIONAL
jumper
should
be
instalied
in
section
4A
of
the
circuit
board,
Where
conservation
of
primary
current
is
im-
poriani,
such
as
in
mobile
use,
about
1
ampere
of
current
can
be
saved
when
operating
in
the
Vee
oe
alte.
bh
2A
necetnn
nhaneand
receive
mode
by
Maming
the
TOLUOWINg
Cuanges,
if
the
OPTIONAL
resistors
have
been
installed.
(
)
Remove
|
the
short
OPTIONAL
jumper
in
AA
section
4A
of
the
circuit
board,
Connect
one
the
circuit
board.
Pass
this
wire
through
wit
anvuse
VOU,
Bow
wie
oC
MD
US
gro
ommet
AA
and
along
the
cable
assembly
to
the
relay,
Connect
the
wire
end
to
lug
8
of
the
relay,
with
the
yellow-white
wire
of
the
relay,
With
the
relay
wired
in
this
manner,
bleeder
current
will
flow
only
when
the
Transceiver
is
operated
in
the
transmit
mode,
However,
the
Ext
Relay
jack
can
no
longer
he
used
"to
control
an
external
cir-
cuit,
such
as
a
linear
amplifier,
therefore,
this’
modification
is
not
always
practical.
ALIGNMENT
AND
Refer
to
Pictorial
19
r
the
following
steps
(fold-out
from
Page
47)
Set
the
controls
as
follows:
RF
GAIN:
fully
clockwise.
VOX,
VOX
DELAY,
AF
GAIN,
and
TUNE
LEVEL:
half
rotation,
FINAL
BIAS
and
MIC
GAIN:
fully
counterclock-
wise,
Meter
Switch:
BIAS
SET.
Tram
TAAT
o..
PUING
LLUIN
switch:
OF
F.
Using
an
ohmmeter,
make
the
following
re-
sistance
checks
at
the
Power
plug:
Pin
1:
30
KQ
Pin
3:
50
KQ
(10
KQ
when
using
OPTIONAL
resistors)
Pin
4:
Infinity
ALTERNATE
POWER
SUPPLY
CONSIDERATION
Power
supplies
other
than
those
previously
|
Mentioned
may
be
used
with
the
Transceiver,
The
power
supply
used
must
meet
the
require-
ments
listed
in
the
Specifications
of
this
manuai,
-with
the
following
possible
exception:
If
the
power
suppiy
meets
ali
requirements
except
that
its
B+
screen
voltage
is
too
high
(275
to
325
volts),
the
foliowing
changes
can
be
made
on
the
Transceiver
circuit
board,
These
changes
ee
at
oem
e
tr
lta
ee
ba
bese
will
provide
the
proper
screen
Vvorrage
to
tunes
V5,
V6,
and
V7,
NOTE:
The
OPTIONAL
re-
mate
ee
hi
me
ed
hhntess
aan
wnt
aieniind
in
the
mae
SiStOrs
WieNnwuionéea
HEioOwWw
are
Hor
suppiiea
Sik
UAL
kit,
These
resistors
can
be
obtained
from
a
Trnal
wavta
aimrniliscay
UUGL
PaGLlS
SUppsic.,
1,
Remove
the
long
jumper
in
section
4A
of
the
circuit
board,
2.
Install
a
1000
2
4to7
watt
resistor
anda
10
KQ
7
to
10
watt
resistor
atthe
OPTION-
AL
locations
in
section
4A
of
the
circuit
board,
These
resistors
should
be
placed
about
1/4"
above
the
circuit
board
to
pre-
vent
heat
damage
to
the
board,
Use
1/2"
of
sleeving
on
each
lead,
3,
Install
the
short
OPTIONAL
jumper
at
V
in
section
4A
of
the
circuit
board.
NOTE:
Be
sure
the
power
cable
of
the
power
supply
has
#18
or
larger
wire
for
the
filament
circuit,
All
other
wires
can
be
as
small
as
#22
wire.
If
any
of
these
resistance
readings
vary
more
than
+20%
refer
to
the
In
Case
Of
Difficulty
section
of
the
manual
before
proceeding,
RECEIVER
ALIGNMENT
NOTE:
Phono
plugs
are
provided
for
making
connections
to
the
sockets
on
the
rear
of
the
Transceiver.
Connect
an
8
2
speaker
(a
3.2Mto
16
2
speaker
may
be
used
with
reduced
efficiency)
to
the
SPKR
socket,
arffl
a
50
Qdummyloadto
the
ANT
socket,
With
the
power
supply
wired
according
to
the
instructions
in
the
Power
Supply
section
of
the
Manual,
connect
it
to
the
Transceiver
Power
plug.
Make
sure
the
VOX
DELAY
control
is at
the
center
of
its
rotation.
a

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