Heathkit SB-401 - Page 26

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)
Set
the
Transmitter
MODE
switch
to
USB,
~_—
—
ADJUST control for a 50 ma indication
on the meter of the Transmitter, Refer to
Figure
5-1
on
Page
108
for
the
explanation
of the meter scales,
_(
)
Return
the
FUNCTION
switch
to
STBY,
(
)
Set
the
METER
switch
to
REL
PWR,
(_)
Install
the
6CL6
driver
tube
(V9),
( ) Install a large tube shield on V9,
(
)
Turn
the
FUNCTION
switch
to
TRAN,
NOTE:
In
the
following
step,
aftcr
the
Transmitter
is
keyed,
quickly
adjust
both
the
DRIVER
and
FINAL
knobs
for
maximum
output
before
adjusting
the
Driver
coils.
(_)
Key
the
transmitter
and
readjust
both
the
Driver
plate
and
grid
coils
for
maximum
relative
power
output
at
each
position
of
the
band
switch.
MICROPHONE CONNECTION
NOTE:
It
is
recommended
that
a
high
impedance
microphone
that
is
equipped
with
a
push-to-talk
switch
be
used
with
this
Transmitter,
so
ad-
vantage
may
be
taken
of
both
the
PTT
and
VOX
operation,
A
2-pin
male
microphone
con-
nector
(Amphenol
80MC2M)
is
furnished
for
this
purpose,
Figure
2-5
on
Page
95
shows
a
typical
micro-
phone
and
its
connections,
Install
the
micro-
phone
connector
on
the
end
of
the
cable
as
shown
in
the
Figure,
Then
connect
the
microphone
to
the
MIC
socket
on
the
Transmitter,
LMO ADJUSTMENT
NOTE: For the following steps a receiver with an accurate
calibrator must be used.
}
Key
the
Transmitter
and
adjust
the
BIAS
(
~
~
~
~
~
)
Set
the
receiver
MODE
switch
to
USB,
)
Set
the
dial
of
the
receiver
to
3,5
mega-
hertz,
—
Adjust the FINAL control to 80 M,
~
Adjust the FINAL LOAD to 50 Q,
—
Adjust the LEVEL control fully counter-
cockwise,
Connect a coaxial cable between the REC ANT jack on
the transmitter and the Antenna imput jack on an SSB
receiver, such as the SB-303.
If
an
SB-303,
SB-301,
or
SB-300
Receiver
is
being
used,
set
the
FUNCTION
switch
to
OPR.
Set
the
Transmitter
FUNCTION
switch
to
SPOT,
Place
the
BAND
switch
in
the
3,5
position,
Adjust
the
Zero
set
knob
so
the
line
of
the
zero
set
dial
is
directly
under
the
2-1/2
mark
(center)
of
the
slide
rule
dial,
Adjust
both
the
LMO
dial
and
the
slide
rule
pointer
to
zero.
Set
the
Transmitter
MODE
switch
to
CW.
The
Transmitter
and
the
receiver
should
be
at
zero
beat
with
each
other.
If
not,
adjust
the
LMO
DIAL
for
zero
beat
as
follows:
This
setting
should
be
very
close
to
the
original
zero
setting
of
the
LMO.
Remove the LMO DIAL knob and loosen the
circular dial setscrew,