Am Transmission; Fm Transmission; Clarifier (Rx/Tx Offset Tunting); Fm Repeater Operation - Yaesu FT-990 Operating Manual
Yaesu ft-990 transceiver operating manual
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Also See for FT-990:
- Service manual (348 pages) ,
- Operating manual (65 pages) ,
- Manual (6 pages)
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BugiSimulati()n w(th the Tl\lernaLK.cyer
Tha internal
tW
speed keyer
is'Set
at
the
fac.-
t6ry
fo
thll'iamb~~
keyingJ'l\ode
1
in which one
keyl\'r paddle
pf:Qi:luC!l!S
tlitS,
an\j
th_eolher
dahs.
Squeezing }x)th
glvesil}tetnating
dits
anli
qa)ls,.
If
you
pr~fer
bug operation, in whic;h one
padr
d1e·
produces dlts and the other
is
used
tv
man!.!all.Y produce dahs Oike a straight key),
yqu <;an tha!'!Zt:
the
R~tton
of
an
intCr)lal
swild1,
as described on
page 11.
The
keyer
works
for
both semi
and full
break-in
keying;
as described
in l11e
previous
section.
AM.
Transmission
'Il:ansmitte!'
power ou
tpul in the AM
mode is
limited
to
25 watts
(carrier). All
you
need
to
do
is
to adjust the
M
IC
control to avoid
01.'er'modulating,
and
select
the desiredp<>wer
lev~
.
0 With the
AM
mode
selected,
set
the
meter
selector
to
the
PO
position,
and
preset
the
RF
PIIR
control
fully
clockwise.
0
Even
if
you
have
a
I ready
set
the
M
I
c
control
as
described for
SSB
transmission,
you
will
need
to
readjustit
to
av-oid overrnod
ulation.
·
0
VOX
operation
can be
used in
the AM
mode,
but
for
now,
make sure
the
VOX
switch
is
off,
so
as
not to
confuse adjustments.
0
Close the
PTI'
switch and
speak
inte the micro-
phone
while
adjusting
the
MIC
control
to
the
point
where
v~ry
slight
movement of the
(PO)
met-er
can
be seen.
Don't
set
it too far beyond
this
point or
yc;nir
signal
will become
distorted.
0
Adjust
tJ1e
RF
PW
R
controlfor
the
desired
outp,ut.
The
speech processor
i~
disabled
i:n
AM
mode,
FM
Transniission
For
FM
tran~mission,
the
only control on
the
front
panel you
need
be
concerried about
is
R
F
PIIR.
Miewphone
gain
for
F1' v
1
is
set
the
separate
FH M
IC
GAIN
control
in the top
-
panel,
and normally
needs
no adjiJStlnent
after
leaving
the
factory.
If
you
re-
ceive
signals
reports of
low audio witti
a
strong
carrier, you rna
y wantto inereasa
the
gain,
or
if
you
receive
reports
of
distortion,
you
may want to
de-
crease
it.
Otherwise,
we·
suggest
l'
e aving it
alone.
All
you
need
to do is set
the
H
ElEII.selector
to
the
PO
position,
and
.adjust the
RF
PWR
control for the
desired
output while
tra~mitting.lf.you
need, full
Operation
Transmitting
power, keep your transmissions to three
minute.
s
or
less, with Lhe same
time
for
reception.
You ca11
use l11e VOX circuit
fort/
r switching,
if
desh·ed.
See
also the
FM Repeater Operalio11
box.
Clarifier (Rx/Tx Offset
Tuning)
The
three
CL.AR
buttons
near
the upper
rlght
comer
of
the panel
and the
CUR
knob
are used to
off~et
either
the
receive, trimsrnit
or
both
'frequen-
cies
from their
Settings
on the frequency
display.
The three
small
numbers
on
the
display just to
the
rlg)1
t
of
the frequency show the
current
clarifier
offset.
The
clarifier
controls on
l11e
FT-990
nre
de-
signed
to allow
you to
preset an-offset (up
to
9.99
kl-iz)
withou
t
actually retuning,
and
then to acti-
vate it
with the
clarifier's
RX
arid
TX
butto.ns.
Perform the
following steps,
if
you
like, to familiar-
ize
your~f
with the
"clarifier controls:
0
Tum
the
CLAR
knob
b{1ck
and forth
while
watch-
ing
t he
center
of
the display.
Notice that a
minus
sign appears
when the
offset
is
negative,
EM
Repeater Operation
The
F:T
-990
inCJud';es..sev:.eral
f~ittures
specifl-
cally intenoei1 for operationon
r,M repj!aters
;tbove
29
MHz
which
use
lOQ.ikHz
splits.
To
lOCi!~
th' i
?Se repeatl;!rs, ypu.can
asl:;..atouna
the
calling
channel
(29.6
MH:Z),
or you
truly
want to load a
block
of n1emory
channels
(page
35)
witli
20-l~Hz
frequency
multiples
from 29.62
to
:l~.6S
MH.z. (and
!11vf
mode,
of
course). Then
set
·
t hee
squelch
SO'
that
there>
ceiver issitent on a1;lear
chann~,
and press
M
SCAN
to~an
the .memories.
When
you find a
repeat€1',
press the
RP-T
but-
ton,
once
fCJr
"
...!'
shift
(to
tro.nsmil100
k.Hz
belQw
yQur receiving Jr(!guency).
Pressil)g
it
again vvill select
"-l'"
shlft,
but this
iS
not
usacl
!lbove29.6
.MHz.
Pl'es-~
i
ranee more
to'
return
tO.Slni.ple~<.
Tiya
quick
ID
transmission
to
make
sure you
have the sl\ilhigbl
(the
FT-990
also
auton'laJ-
itally
trafisnilt\l.a
l.o"iv-112vel
88.5•Hz
S\l~audi
ble
tone
.during
FM.Repealer transmissions,
to access
those
repeater
that
requir-e
it).
.One(! yQu .nave
.made
contact thi'ougli the
repeater, you can
store
the
£requeney,
mo.
d e
and repeater
shiit
settings
~n
memory (page
35)
for
later
recall.
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page33
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