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ANTENNA
MATCHING
PROCEDURE
THIS
SECTION SHOULD
BE
STUDIED CARE-
FULLY BEFORE
USING
THE
FC-700.
WHILE
A
STRAIGHTFORWARD PROCEDURE,
AN-
TENNA
MATCHING
WITH
A
COUPLER SUCH
AS
THE
FC-700 INVOLVES
A
LOGICAL
PROGRESSION
OF
STEPS,
AND
FAMILIARITY
WITH
THE
TOTALITY
OF THE
FOLLOWING
SECTION
WILL
AVOID
POSSIBLE DAMAGE
TO
THE
EQUIPMENT CAUSED
BY
INCORRECT
ADJUSTMENTS.
To
summarize
thé
procédure
that
is
followed
in
using
thé
FC-700 antenna coupler
to
match
a
feed-
line
to
thé
transmitter,
thé
following
process
takes
place:
1)
The
proper
inductance
is
chosen using
thé
BAND
selector.
2)
The
LOAD
and
TUNE
controls
are
adjusted
to
secure
a
minimum
SWR.
Thèse
two
controls
should
be
adjusted
one at a
time,
so as to
avoid
confusion
as to
thé
effect
of
any
particular adjustment.
A
typical
pro-
cédure
to
follow
would
be to
apply
power,
adjust
thé
TUNE control
for
minimum SWR,
then
adjust
thé
LOAD direction either
to
thé
right
or
left.
Once
thé
LOAD control
has
been
changed,
thé
TUNE control should again
be
adjusted
for
minimum SWR;
if
this
procédure improves
thé
SWR,
it
should
be
continued
by
further
moving
thé
LOAD control
in
thé
same
direc-
tion,
but if
thé
initial change
in
thé
LOAD
control worsens
thé
SWR,
move
thé
LOAD
control
in
thé
opposite direction.
It
will
be
clear
to
thé
operator when
thé
LOAD control
is
being adjusted
in
thé
right direction.
Refer
to
Figure
1,
where
thé
approximate positions
of
thé
BAND, LOAD,
and
TUNE controls
are
shown
for
matching
to a
50-ohm
load.
The
internai
dummy load
is
used
to
preset
thé
controls
for
thé
operating frequency.
The
antenna
may
then
be
selected,
with
final
tuning
taking
only
a few
seconds.
(1)
Set up
thé
FT-77
or
other
transceiver
for
normal
opération.
Set
thé
DUMMY/ANT
switch
to
DUMMY
to
sélect
thé
built-in
dummy
load. Reduce
thé
drive control
on
thé
transceiver
to
thé
minimum,
and
place
thé
transmitter
in
thé
"standby"
condition
for
thé
moment.
(2)
Place
thé
BAND,
LOAD,
und
TUNE
ton
trois
in
thé
positions shown
in
Figure
1 for
thé
frequency
nearest
that
at
which
thé
antenna
is
to be
matched.
Set
thé
function switches
to
thé
FWD,
SWR.
and
150W
positions.
Set
thé
SWR
SETknob
to
thé
12
o'clock
position.
(3)
Make
preliminary
matching adjustments with
as
little transmitter power
as
possible. Place
thé
FT-77
in
thé
"transmit"
condition
(CW
and
press
PTT),
and
slowly advance
thé
drive
until
deflection
of
thé
meter
needle
on
thé
FC-700
is
observed.
Adjust
thé
SWR
SET
control
to
align
thé
meter needle
with
thé
SET
marking
on
thé
meter
scale.
Now
switch
thé
FWD/REV switch
to REV
for
accurate
reading
of
thé
SWR.
(4)
Adjust
thé
TUNE
control
for
minimum SWR.
If
necessary,
adjust
thé
SWR SET
control
and/or
transmitter drive
to
ensure proper
calibration
(be
certain
to
check
thé
SWR
meter
sensitivity with
thé
FWD/REV switch
in
thé
FWD
position, then switch back
to
REV).
Once
thé
"dip"
has
been found using
thé
TUNE
control, move
thé
LOAD control
a
small
amount
in
either direction,
left
or
right.
Adjust
thé
TUNE control
for a
"dip"
again,
and if
thé
SWR is
lowered,
move
thé
LOAD
control
slightly
more
in
thé
same direction
as
before. Again
"dip"
thé
TUNE control,
and
continue this procédure until
no
further
improvement
is
noted.
If
thé
initial direction
of
adjustment
of
thé
LOAD control makes
thé
SWR
higher, move
thé
control
an
equal
distance
in
thé
opposite direction
from
thé
starting
point,
and
"dip"
thé
TUNE
control.
Remember
to
recheck
thé
calibration
of
thé
SWR
meter
to
avoid misleading readings.
- 6
7


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