Yaesu FC-700 User manual
INSTRUCTION
MANUAL
FC-7
YAESU
MUSEN
CO.,
LTD
C.P.O.
BOX
1500
TOKYO,
JAPAN
YAESU
FC-700
ANTENNA
COUPLER
GENERAL
The
FC-700
isan
ultra-compactantennatuner
for
thé
FT-77
transceiver.Designed
for
opération
on
thé
80
through
10
meter
amateurbands
(including
WARC
bands),
thé
FC-700
will
provide
a
50-ohmload
to
thé
transceiverwhen
thé
feedpointimpédance
of
thé
antenna
System
is
within
thé
approximaterange
of10
ohms
to250
ohms.
The
FC-700
includes
a
built-in
SWRand
powermeter,providing
15
watt
and150
watt
scales.
Alsoincluded
isan
internai50-ohmdummyload,which
maybe
selectedinstead
of
thé
antenna
for
preliminarycoupleradjustments.
A
THRU
position
of
thé
bandswitch
also
allows
thé
antenna
tobe
connecteddirectly
to
thé
transceiver,
bypassing
thé
tuning
circuit.
High-quality
low-loss
components
are
used
throughout
thé
FC-700.
The
matchingfunction
it
performs
means
thé
transmitter
can
always
"see"
thé
résistive
termination
for
which
it
was
designed.
The
inhérentselectivity
of
thé
FC-700
matchingcircuitry
helps
attenuate
harmonies
too,
thus
reducing
thé
chance
of
harmonic-related
TVI
or
out-of-bandémissions.
Please
readthismanual
inits
entirety,
soasto
dérivemaximum
benefit
from
your
new
FC-700.
SPECIFICATIONS
Frequency
coverage:
3.5
7
10
14
18
21
24.5
28
3.5-4.0
MHz
7.0-7.5
MHz
10.0-10.5
MHz
14.0-14.5
MHz
18.0-18.5
MHz
21.0-21.5
MHz
24.5-25.0
MHz
28.0-29.7
MHz
Input
impédance:
50
ohms
Max.
variation
in
load
impédance:
approx.
10-250
ohms
Insertion
loss:
0.5dB
max.
Rear
panel
antenna
connection:
UHF
type
connecter
Dimensions:
238(W)x55(H)x
180(D)mm
Weight:
2.0kg
SWRcalibration:
To5:l
SWR
Maximumtransmitter
power:
150WRF@50ohms
Power
meter
calibration
scales:
15
W,
150W
MODIFICATION
OFTHE
FC-700
FORUSE
WITH
IHE
FT-747GX
The
relay
and
panel
lamp
in
(he
FC-700
require
8
VDC.
supplîed
through
thé
DC8Vjack
on
Ihe
rear
of
thé
Antenna
Tuner.
Although
itis
possible
10
use
thé
FC-700
without
modification
by
supplying
8V.
from
an
external
source,
thé
FT-747GX
does
not
offer
suchvoltage.
Thismodificationallows
thé
FC-700
tobe
operated
from
thé
DG13.5V
outpui
jack
on
thé
rearpanel
ofIhe
FT-747GX.
so
that
thé
FC-700
canbe
switched
onand
off
with
thé
tran^eiver.
Be
sure
to
change
thé
DC8Vlabel
on
thé
FC-700
to
DC13.5Vafter
making
this
modification.
Remove
thé
covers
from
thé
FC-700.
(1)
Referring
10
Figure
I.
remove
thé
two
BLACK
wires
from
thé
meterlamp
terminal,
and
connect
thé
one
from
thé
DC8V
jack
to
thé
solder
lug
near
thé
mêler
(thé
other
is
not
used).
(2)
Install
a
56-ohm.
2-watt
resistor
between
thé
meterlamp
terminal
and
thé
solder
lug
with
thé
BLACK
wire.
(3)
Referring
to
Figure
2,
remove
thé
BLUE
wire
from
thé
terminal
post
on
thé
RL
Unit.
(4)
Connect
oneendofa
100-ohm,
4-watt
resistor
to
thé
terminal
post.
and
connecl
thé
BLUEwire
to
thé
other
endof
thé
resistor.
Modification
is
complète.Replace
thé
covers.relabel
ihe
DC8V
jackDCI3.5V,
and
connect
this
jack
to
thé
+13.5V
jack
on
thé
FT-747GX.
Install
a
56-ohm,
2W
Resistor
Remove
&
reconnect
thé
BLACK
wire
Figure
1
Installa
lOO-ohm,
I/2W
Resistor
Remove
&
reconnect
thé
BLUE
wire
Figure
2
-2-
FRONTPANELCONTROLS
AND
SWITCHES
(1)
Meter
The
meter
provides
indication
of
thé
SWRor
power
level.
(2)SWRSET
This
control
sets
thé
sensitivity
of
thé
SWR
meter.
(3)
Function
Switches
REF/FWD
Thisswitchsélects
forward
orre-
flected
power
indication
on
thé
meter.
SWR/PO
This
switch
sélects
indication
of
thé
SWR
or
poweroutput
on
thé
meter.
15W/150W
This
switch
sélects
indication
of
thé
outputpower
level
scales:
15or
150
watts
full
scale.
(4)
TUNE
The
TUNEcontroldrives
a
variablecapacitor
which
providescapacitiveadjustment
of
thé
coupl-
ing
between
thé
transmitter
and
thé
impédance
established
by
thé
BAND
switch
and
LOAD
control.
The
TUNE
and
LOAD
controls
are
adjusted
for
minimum
SWR.
(5)
BAND
The
BANDselectorsélects
thé
appropriate
tapon
thé
maintuninginductor
for
thé
band
in
use.
(6)
DUMMY/ANT
This
switchsélectseither
thé
antenna
or
connec-
tion
to
thé
50-ohm
dummy
load.
When
thé
built-in
dummy
load
is
selected,
thé
antennacouplertuning
controls
are
still
in
thé
line,
so
preliminary
adjust-
ment
of
thé
coupler
canbe
performed.
When
this
button
is
pressed
and
thé
BANDselector
issetto
thé
THRU
position,
only
thé
dummy
load
and
meterremain
in
thé
circuit.
(7)
LOAD
The
LOAD
control
drives
a
variable
capacitor
which
adjusts
thé
coupling
between
thé
antenna
feedline
and
thé
main
BANDinductor.
-3-
REAR
APRON
(1)
ANT
This
isa
standard
UHF
connecter
for
thé
antenna
feedline.
(2)
GND
Connect
a
goodearthground
at
this
point.
(3)
DC8V
The
DC8V
Une
from
thé
FT-77
transceiver
should
be
connected
hère,
to
supply
thé
meter
lamp
on
thé
frontpanel
of
thé
FC-700.
(4)
INPUT
Connect
thé
coaxialcable
to
thé
FT-77
ANT
jack
at
thispoint.
ANTENMA
FT-77
Séries
COAXIAL
iCABLE
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DDDDDDP.
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J
CONNECTIONCABLE
A
INSTALLATION
Connect
thé
antenna
to
thé
rearpanel
ANT
jack,
and
connect
a
50-ohm
coaxialcablebetween
thé
FT-77
and
thé
FC-700.
Connect
thé
DC
cable
between
thé
DC8Vjacks
of
thé
FC-700
and
thé
FT-77.
Connect
a
goodearthground
to
thé
GND
terminal
on
thé
rear
of
thé
antennacoupler,
using
a
Keavy,
braided
wire
less
than
10
feet
long
for
connection
to
thé
stationground
bus.
When
using
a
transceiver
otherthan
thé-
FT-77,
be
absolutelycertain
to
observe
thé
properpolarity
and
level
of
thé
voltageapplied
to
thé
rearpanel
DC8V
jack.
Donot
exceed
8
volts
DC,nor
apply
AC
power
ofany
kind,
to
this
jack.
Our
warranty
does
not
coverdamagecaused
by
improper
power
connections
to
this
equipmenî.
FT-77/FV-700DM/FC-700
(or
FTV-700)/MMB-16
FT-77
FP-700
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ACCORD
-5 -
ANTENNA
MATCHING
PROCEDURE
THIS
SECTIONSHOULD
BE
STUDIEDCARE-
FULLYBEFORE
USING
THE
FC-700.
WHILE
A
STRAIGHTFORWARDPROCEDURE,
AN-
TENNA
MATCHING
WITH
A
COUPLERSUCH
AS
THE
FC-700INVOLVES
A
LOGICAL
PROGRESSION
OF
STEPS,
AND
FAMILIARITY
WITH
THE
TOTALITY
OFTHE
FOLLOWING
SECTION
WILL
AVOID
POSSIBLEDAMAGE
TO
THE
EQUIPMENTCAUSED
BY
INCORRECT
ADJUSTMENTS.
To
summarize
thé
procédure
that
is
followed
in
using
thé
FC-700antennacoupler
to
match
a
feed-
line
to
thé
transmitter,
thé
following
process
takes
place:
1)
The
proper
inductance
is
chosenusing
thé
BAND
selector.
2)
The
LOAD
and
TUNE
controls
are
adjusted
to
secure
a
minimum
SWR.
Thèse
two
controls
should
be
adjusted
oneata
time,
soasto
avoid
confusion
asto
thé
effect
of
any
particularadjustment.
A
typical
pro-
cédure
to
follow
would
beto
apply
power,
adjust
thé
TUNEcontrol
for
minimumSWR,
then
adjust
thé
LOADdirectioneither
to
thé
right
or
left.
Once
thé
LOADcontrol
has
been
changed,
thé
TUNEcontrolshouldagain
be
adjusted
for
minimumSWR;
if
this
procédureimproves
thé
SWR,
it
should
be
continued
by
further
moving
thé
LOADcontrol
in
thé
same
direc-
tion,
butif
thé
initialchange
in
thé
LOAD
controlworsens
thé
SWR,
move
thé
LOAD
control
in
thé
oppositedirection.
It
will
be
clear
to
thé
operatorwhen
thé
LOADcontrol
is
beingadjusted
in
thé
rightdirection.
Refer
to
Figure
1,
where
thé
approximatepositions
of
thé
BAND,LOAD,
and
TUNEcontrols
are
shown
for
matching
toa
50-ohm
load.
The
internai
dummyload
is
used
to
preset
thé
controls
for
thé
operatingfrequency.
The
antenna
may
then
be
selected,
with
final
tuning
taking
only
a few
seconds.
(1)
Setup
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
drivecontrol
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
positionsshown
in
Figure
1 for
thé
frequency
nearest
that
at
which
thé
antenna
is
tobe
matched.
Set
thé
functionswitches
to
thé
FWD,
SWR.
and
150W
positions.
Set
thé
SWR
SETknob
to
thé
12
o'clock
position.
(3)
Make
preliminary
matchingadjustmentswith
as
littletransmitterpower
as
possible.Place
thé
FT-77
in
thé
"transmit"
condition
(CW
and
press
PTT),
and
slowlyadvance
thé
drive
until
deflection
of
thé
meter
needle
on
thé
FC-700
is
observed.
Adjust
thé
SWR
SET
control
to
align
thé
meterneedle
with
thé
SET
marking
on
thé
meter
scale.
Now
switch
thé
FWD/REVswitch
toREV
for
accurate
reading
of
thé
SWR.
(4)
Adjust
thé
TUNE
control
for
minimumSWR.
If
necessary,
adjust
thé
SWRSET
control
and/or
transmitterdrive
to
ensureproper
calibration
(be
certain
to
check
thé
SWR
meter
sensitivitywith
thé
FWD/REVswitch
in
thé
FWD
position,thenswitchback
to
REV).
Once
thé
"dip"
has
beenfoundusing
thé
TUNE
control,move
thé
LOADcontrol
a
small
amount
in
eitherdirection,
left
or
right.
Adjust
thé
TUNEcontrol
fora
"dip"
again,
andif
thé
SWRis
lowered,
move
thé
LOAD
control
slightly
more
in
thé
samedirection
as
before.Again
"dip"
thé
TUNEcontrol,
and
continuethisprocédureuntil
no
further
improvement
is
noted.
If
thé
initialdirection
of
adjustment
of
thé
LOADcontrolmakes
thé
SWR
higher,move
thé
control
an
equal
distance
in
thé
oppositedirection
from
thé
starting
point,
and
"dip"
thé
TUNE
control.
Remember
to
recheck
thé
calibration
of
thé
SWR
meter
to
avoidmisleadingreadings.
-6
(5)
Once
thé
initial
procédure
has
beenfollowed
to
yield
a
near-perfect
match,
thé
transmitter
may
be
adjusted
for
tu
11
power,
and
thé
FC-700
LOAD
and
TUNE
controls-may
be
adjusted
to
yield
zéro
deflection
of
thé
SWR
meter.
When
thé
SWR
meter
isnot
calibrated
Witll
thé
SWRSET
control.
it
will
notac-
curately
read
thé
SWR,
butit
will
indicate
minimum
reflected
power.
Donot
exceed
thé
maximum
key-downtimestipulated
for
your
transmitter,
(6)Nowset
thé
DUMMY/ANT
switch
to
ANT.
Following
thé
technique
described
above,
tune
your
antennaSystem
soasto
secure
minimum
SWR
with
thé
antenna.Always
begintuning
atlow
power,
to
avoidpossible
damage
to
transceiver
or
coupler
components
from
unknownimpédances.
BAND
3.5
7
10
14
18
21
24.5
28
FREQ
3.5MHz
4.0MHz
7.0MHz
7.5MHz
10.0
MHZ
10.S
MHz
14.0
MHz
14.5
MHz
18.0
MHz
18.5
MHz
21.0MHz
21.5MHz
24.5
MHz
25.0
MHz
28.0
MHz
29.7
MHz
TUNE
4.5
5.5
6.0
6.0
6.5
7.0
G.
5
7.0
7.5
7.5
7.5
8.0
7.0
7.0
7.0
7.0
LÔAD
7.0
7.5
7.5
8.0
8.0
8.5
B.3
8.5
9.0
9.0
9.0
9.0
9.0
9.0
8.5
9.0
Figure
1
CM
COUPLER
UNIT
TCio
RL
UNIT
Top
View
-7-
NOTES
ON
ANTENNA
MATCHING
(1)
It
is
veryimportant
that
thé
maximumtime
limits
during
tune-upconditions
for
thé
transmit
ter
arenot
exceededwhen
thé
trans-
mitter
is
beingused
at
full
power.
(2)
Any
matching
perfbrmed
by
thé
FC-700
in
thé
shack
will
hâve
no
effect
on
thé
lOSSeS
duetoSWRon
thé
coaxial
Une
between
thé
FC-700
coupler
and
thé
antenna.
The
operator
shouldconsult
oneof
thé
popularantennahandbooks
to
détermine
whether
ornot
matchingbetween
thé
coaxial
line
and
thé
antennamust
be
per-
formed
at
thé
antenna.
For
example,
a
100-
footlength
of
RG8A/U
coaxtypically
hasa
loss
(with
1:1SWR
between
itand
antenna)
of
less
than
1 dBat21
MHz.
If
this
line
is
operatedwith
a
3:1
SWRduetoa
low
or
high
antennaimpédance,
thé
loss
duetoSWR
will
increaseroughly
0.5
dB,#n
imperceptible
dégradation
as
compared
to
thé
1:1
condition.
In
thiscase,attempts
to
reduce
thé
3:1SWR
at
thé
antenna
end
would
serve
no
useful
purpose
asfaras
reducinglosses
in
thé
coax,
through
matchingwith
thé
FC-700
would
improve
thé
impédancepresented
to
thé
transmitteroutput
circuitry-
However,
ifa
500-footlength
of
thé
abovecoaxwereused
instead
of
oniy
ioo
feet,
somewliat
more
than
1 dBof
loss
would
occur
in
thé
ooflv
due
to
thé
3:1
SWR,
possibly
justifyingfurther
matching
attempts
at
tlic
untciinu.
(3)
When
using
a
transceiver
such
as
thé
FT-77
which
has
protection
for
thé
outputtran-
sistors
againsthighSWR,
itcanbe
seenthat
thé
matchingaction
of
thé
FC-700
will
ensure
that
a
50-ohm
load
is
presented
to
thé
output
circuitry,thus
ensuring
full
transmitter
power.
(4)Itmaybe
useful
for
thé
operator
to
record
in
a
notebook
thé
properTUNE
and
LOAD
positions
fora
particularantenna
for
quick
référence.
Alternatively,
appropriate
labels
may
be
fabricated
and
applied
to
thé
FC-700
front
panelshowing
thé
properpositions
of
thé
TUNE
and
LOAD
controls
fora
particular
frequency.
JOf
FC-70Q
CIRCUIT
DIAGRAM
-8-
PARTS
LIST
!
MAIN
CHASSIS
RELAY
UNIT
Symbol
No.
VR01
VC01
VC02
MOI
SOI
J01,02
J03
LOI
L02
C13
Cil
C06
C07,08,10,12
C(J4,Ù5,09
C03
C02
COI
C14,15
Part
No.
J6080070
K90000029
K90000028
M0290020
N0190069
PI
090028
PÛ090093
L0020799B
L0020800B
K
3
0309
005
K3
0309001
K30309004
K
3
03
09006
K30309011
K30309010
K30309009
K30309008
K13170103
Description
POTENTIOMETER
VM10A949C-50knB
VARIABLE
CAPACITOR
YB-290,
290pF
YB-430,
430pF
METER
SY-50
DC
200MA
SWITCH
SRS4.49
RECEPTACLE
M-BR-06D
X-G9242
INDUCTOR
Symbol
No.
D201
C201
RL201
Part
No.
C0021240
F0002124
G2090001
K13170473
M1190025
Q5000011
Description
P.C.B
with
Components
Printed
Circuit
Board
DIODE
10D1
CAPACITOR
RELAY
MR-31
Wrapping
terminal
C
SWITCH
A
UNIT
Symbol
No.
S301
Part
No.
C0021250
F0002125
N4090034
Description
P.C.B
u-ith
Components
Printed
Circuit
Board
SWITCH
SUT31A
^3i^^^tf&X
°
SWITCH
B UNI
1
CAPACITOR
Dipped
mica
IkWV
47pF
75pF
150pF
180pF
300pF
330pF
910pF
ISOOpF
Ceramic
disk
50WV
0.01*jF
CM
COUPLER
UNIT
Symbol
No.
D101.102
R102
R103.104
C101
Cl02
VC101
T101
L101
Part
No.
C0020560
F0002056A
G2090038
J01245430
J00245103
K30176471
K13170473
K91000019
L0020301A
L1190017
Q5000011
Descnption
P.C.
Bwiih
Components
Prinîed
Circuit
Boaid
DIODE
1SS16
RESISTOR
Carbon
film
I/4WTJ
43îï
VJ
lOkfî
CAPACITOR
Dipped
mica
SOWV
470pF
Ceramicdisk
"
0.047MF
TRIMMER
CAPACITOR
ECV-1ZW
10x40,
lOpF
INDUCTOR
FL5H-102K
ImH
Wrapping
terminal
C
Symbol
No.
D401
S401
R401
Part
No.
C0021260
F0002126A
G
2090
134
N4090035
J00245561
Description
P.C.B
With
Componenis
PrintedCircuitBoard
DIODE
LED
TLY-205
SWITCH
SUT12A
RESISTOR
Carbon
film
1/4WVJ
560n
VR
UNIT
Symbol
No.
VR501
VR502
R501
R502
Part
No.
C0021270
F0002127
J5
1723472
J51723223
J00245102
J00245332
Q5
0000
11
Description
P.C.B
with
Components
Printed
Circuit
Board
POTENTIOMETER
SR-19R
4.7kîlB
22kfîB
RESISTOR
Carbon
film
1/4WVJ
Ikîî
3.3kïl
Wrapping
terminal
C
DUMMY
LOAD
UNIT
Symbol
No.
R601-620
C601
Part
No.
J20375102
K3130900I
Description
RESISTOR
RSF-5BJ
5W
Ikîî
CAPACITOR
Mica
IkWV
lOpF
ACCESSOR1ES
>
Symbol
No.
Part
No.
T9101220
T9100160A
R3054370
Description
Connection
cable
Plastic
Foot
YAESU
v
-
E8285100
(008X-IS)
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