Heathkit SB-401 - OPERATING CONDITIONS; TRANSMITTER OPERATION

HEATHEIT®
Page 109
OPERATING
CONDITIONS
Before
proceeding
to
the
Transmitter
Operation
section,
you
should
know
the
operating
conditions
available
using
different
combinations
of
equip-
ment
and
control
settings,
These
allowable
oper-
ALLOWABLE
OPERATING
CONDITIONS
Equipment
Combination
FREQ CONTROL | Frequency
Switch
SB-401
and
Unlocked
Transmitter
SB-303, or Locked Receiver
SB-301, or Unlocked Transmitter
SB-300. Locked Receiver
Unlocked Transmitter
SB-401
and Other
Receiver
Unlocked Transmitter
ating
conditions
are
listed
inthe
following
chart,
After
you
are
familiar
with
this
information,
Controlled By
proceed
to
Transmitter
Operation,
SBA-401-1
Crystal
Accessory
Package
FUNC TION
Switch
LMO, BFO, and
HET OSC Trans-
ceive Cables
TRCV
TRCV
TRCV (a)
TRCV (a)
SPOT or TRAN
Not Installed |Connected
Not Installed |Connected
Installed Connected
Installed Connected
Installed
Disconnected
Installed
Disconnected
SPOT
or
TRAN
(a)
When
using
the
SB-401
Transmitter
in
combination
with
the
SB-303,
SB-301,
or
SB-300
Receiver
with
the
transceive
cables
connected
and
the
SBA-401-1
Crystal
Accessory
package
installed,
the
Transmitter
FUNCTION
oes
be
at
STBY
or
TRGV,
otherwise
a
stcady
tone
will
be
heard
in
the
Receiver.
TRANSMITTER
OPERATION
The
following
operation
information
is
divided
into
two
separate
—
sections:
SB-303
Receiver
(transceiver
operation),
and
Transmitter
Operation
Only.
Each
of
these
sections,
in
turn,
is
divided
into
CW
and
SSB
operation.
Operation — with
OPERATION
WITH
SB-303
RECEIVER
When
operating
the
SB-40]
Transmitter
and
SB-303
Receiver
a
a
transceiver,
the
LMO
mode
is
selected
from.
the
ransmitter
front
panel.
Either
the
Transmitter
or
Receiver
tan
be
used
for
frequency
control
of
the
Transmitter.
Lf
the
REQ
CONTROL
switch
is
in
the
LOCKED
(RCVR)
osition,
the
Transmitter
will
be
transmilting
on
the
lequency
at
which
the
Receiver
is
set.
Therefore,
it
is
mportant
that
the
Receiver
dial
always
be
set
within
one
of
he
amateur
bands
when
thé
Transmitter
is
used.
If
the
FREQ
CONTROL
switch
is
ih
the
UNLOCKED
position,
the
MO
in
the
Transmitter
controls
the
operating
frequency.
NOTE:
It
may
be
necessary
to
readjust
the
heterodyne
wcillator
coils
of
the
Receiver
due
to
the
loading
by
the
Transmitter
heterodyne
oscillator
circuit.
Follow
the
SB-303
heterodyne
Oscillator
Adjustment
procedure
(using
the
SB-303
calibrator
signal)
with
the
Transmitter
connected
to
the
Receiver.
It
is
not
necessary
to
turn
the
Transmitter
on
for
these
adjustments.
Turn
the
Transmitter
chassis
on
edge,
With
the
Receiver
connected
to
the
Transmitter,
place
an
RF
probe
on
the
center
pin
of
the
BFO
jack
on
the
rear
apron
of
the
Transmitter,
With
the
Receiver
turned
on
(the
Transmitter
need
not
be
on
for
this
adjustment),
adjust
the
Receiver
BFO
output
Coil
(L20)
until
a
maximum
is
obtained
(approximately
5
volts),
This
coil
in
the
Receiver
is
now
properly
set
for
transceiver
operation
and
will
not
need
further
adjustment,
CAUTION:
Do
not
attempt
to
transceive
with
the
Receiver
in
the
AM
or
CAL
modes,
as
the
units
will
not
function
properly,
Make
sure
the
BAND
switches
of
the
Trans-
mitter
and
Receiver
are
always
in
the
same
positions,