Yaesu FT-767GX, Operating Manual

Page: 23 / 40

4.
7
Transmitter Operation: General SWR
(1)
P r e s e t t he DR I V E con t r o l ( ou t e r k n ob ,
A t this poi n t you a r e probab l y ready t o try
l e f t m o s t c o n t ro l ) fu l l y c l o c k wise.
out the t r a n s mi t t e r. R e c a l l t h a t v a lid t r a n s ­
mitting frequencies below 30 MHz are only the
500
kHz frequency segments that include ama­
t eur b ands ( §
1.1),
and that you shou l d be
u sing an a n te n n a d e signed for t h e bands on
which you wish to operate.
Do not t r ansm i t without a proper antenna
( see § 3. 4 for antenna information ) .
4.
7.1
SWR Measuring
&
Antenna Matching
Not e :
To obt ain an accurate SWR reading
and to s e t t h e au t o m a tic a n t e n n a t u n e r
you m u s t t r a ns mi t a s t e ady c a r ri e r a t f u l l
power o n t h e air.
P l e a s e m ake ce r t ai n
that t h e frequency is not in use by o t h e r
s t a tions b e f o r e t u ning up.
A l ways ask
fi r s t wi t h a s h o r t t r a n s mi s s i o n if t h e
freq u e n c y is i n use, and then lis t e n c a r e ­
f u l l y f o r a t l e a s t 15 s e c o n d s b e f o r e
keying t h e t r an s mit t e r fo r SWR m ea s u ri ng
or a n t e n n a t u ni ng.
Keying the Transmit ter
I f you do not have a key or keye r p a d d l es
c onne c t e d t o t h e KEY j ack o n t h e r e a r p a n e l ,
use the C W mode for SWR measuring and ant enna
tuning, and use the MOX button ( above the M I C
j ack ) t o k e y t h e t r a n s mit t e r duri ng t h e s e p r o ­
cedures.
I f you have a key or paddles connec­
ted, m ake sure the KEYER switch at the right
side of t h e front p a n e l is O F F ( ou t ) .
You
s ti l l use t h e CW m o d e , b u t c l os e t h e k e y ( o r
s q ueez e t h e p ad d l e s ) t o key t h e t r a n s mi t t e r
wi th t h e VOX swi t c h on, ins t e a d o f using t h e
MOX switch.
I f you h a v e an ex t e r n a l e l e c t ronic keyer c o n ­
n e cted to t h e KEY j a ck, and i f i t is not
equipped wi t h a ' t u n e ' function t o s h o r t the
keying line, use the FM mode and the MOX but ­
ton to key t h e t r a n s mi t t e r. I n t his c a se,
however, b e c a r e f u l not t o s p e ak o r m ake
noises in the microphone when transmitting, as
t h a t c ou l d c ause s e v e r e i n t er ference t o o t he r
s t ations on ne a rby f r e q u e n cies.
Determine now how you will key the transmitter
during the fo l l owing procedures, wi t h your
s t ation s e t up.
( 2 ) Make sure the frequency is c l e a r ( i f
n o t , r e t u n e to a n e a r b y frequen cy and
check ag ain ) .
( 3 ) Press the D I GIT A L SWR button near the
u p p e r rig h t c o r n e r o f t h e di s p l a y
( ' SWR ' wi l l appe a r at the rig h t sid e o f
t h e disp l ay ) .
( 4 ) Select the tune -up mode ( CW or FM, as
d e t ermined above, under 'Keying t h e
T r a n s mi t t e r ' ) .
( 5 ) Key t h e t r a n s mi t t er, w ait o n e s e c o n d ,
and n o t e t h e ( digi t a l ) SWR indic a ti o n
o n the disp l ay. Then unkey the t r a n s ­
mi t t er ( re t u rn t o receive ) .
I f the SWR was below 1.5, press the D I GITAL
SWR swi t ch agai n to r e turn to frequency dis ­
p l a y : a n t e n n a t u ning i s n o t nec e s s a ry.
I f t h e SWR w a s above 1. 5 , you c a n u s e t h e
a n t e n n a t u n e r t o r e m a t ch t he a n t e n n a i f your
o p e r a ting f r e q u ency i s below 30 MHz.
If o n
V H F or UHF, you must readjust t h e antenna it­
s e l f.
Antenna Mat ching
The i n t e r n a l au t o m a tic a n t e n n a t u n e r c a n b e
used t o m atch your antenna t o t h e transmitter
i n the a m a t e u r b a n d s b e l ow 30 M Hz . O n c e a
particular antenna has been matched on a band
and you s e l e c t an o t h e r b a n d, t h e t u n e r s e t ­
tings a r e a u t o m atic a l l y s t o red i n m e m ory, t o
b e r ec a l l ed a u t o m a ti c a l l y whenever t h a t b a n d
is rese l e c t e d. B e f o r e l e a ving t h e f a c t o ry,
t he an t e n n a t u n e r m e m ories a r e s e t fo r a
50-
ohm l o a d on a l l b a n ds. You can re m a t ch t h e
an tenna a t any time as described next ( the new
s e t ti ngs wi l l o v e r w ri t e the o l d on es ) .
A f t e r you h ave set t h e tuner f o r your a n t e n n a
and favori t e o p e r a ti ng frequencies, y o u wi l l
r a r e l y n e e d t o reset it - your set tings wi l l
b e rec a l l e d a u t o m a ti c a l l y. H o w e ver, i f you
use a di f fe r e n t a n t e n n a, don ' t forget t o reset
t h e tu ner.
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