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I MODEL 4OO TRANSCEIVER
C.
Ope ration {Cont)
4.
Your Swan 400 will
automatic ally
transmit
on exactly the same {!e-
quency as the one to which you are
Iistening.
There is no adjustment
J o r r n a k i n g t h e m t h e s a r n e , s i n c e ,
by using the 6alne oscillato!
for
both send and receive,
it happens
automatically.
If separation
of re-
ceive and transmit
frequency
con-
trol is desired,
the Model 22 dual
VFO adaptor rnay be installed
in
the VFO socket on back of the 400,
a n d a p a i r o f 4 1 0 ' s o r 4 0 6 8 ' s m a y
t h e n b e p ) u g g e d i n t o l h e a d a p t o r '
C A L I B R A T E
T o c a l i b r a t e t h e M o d e l 4 1 0 F r e q u e n c y
Control
Unit dial,
tollow these four
s t e p s :
l.
Rotate the function switch to CAL.
Z,
Rotate th€ Kilocycles
dial to the
1 0 0 k c i n c r e m e n t n e a r e 6 t t h e
d € s i r e d o p e r a t i n g f r e q u e n c y .
3,
An audio beat note will be heard
i n t h e 6 p e a k e r .
4,
Adjust
the Dial Set knob for zero
TRANSMITTER
TUNING
Tuning of the transmitter
is not com-
plicated,
providing
the lew simPle steps
are followed in the co!rect
order.
Do
not attempt ini.tial tuneup without first
p e r f o r m i n g
t h e p t o c e d u r e s f o r R e c e i v e
operation
described
above.
The louow-
ing procedures
assurne that the unit has
b e e n c h e c k e d o u t i n R e c e i v e P o s i t i o n ,
and that the powe! suPPIy and Frequency
Codtrol
Unit are adjrsted
and oPerating
properly.
t.
Rotate the Fonction
S]vitch to
TRANSMIT,
read the cathode
current
on the front Pane1 meter.
l 4
Ouickly
rotate the CAR BAL con-
trol
on the lront
Panel until
the
mete!
reads rninimurn
cathode
Next,
adjust the PA Bias control
on
the rear ol the chassis until the
mete!
reads 50 !na.
3 .
4.
If thi€ is the first
time the trans-
ceiver
is being tuned on this band,
set the PA LOAD
switch to Position
l.
Afte!
experience
ir tuning uP,
the control
rnay be set to whatever
po6ition has been found to be
optimum
on each respective
band.
N o w , i n r a p i d s u c c e s s i o n :
( a ) T u r n t h e C A R . B A L .
c o n t r o l
clockwise
until a 51i8ht increase
in meter
reading is obtained.
(b) Rotate the PA GRID control
for
maximurn
meter
!eading.
(c) Rotate the PA PLATE
control
for minimurn
meter
leading.
(d) Adjust car.
bal. for a leading
o I 1 5 0 r n a .
IMPORTANT
- Tuning the PA PLATE
for minimum,
or "dip, " i3 known ag
i resonatingri the power amplifiel
plate circuit,
and i3 vety
ilnportant
to preserving
tube life.
If the
transceive!
is held in Tran8rnit
or
TUNE position for more than a few
seconds while out of resonance and
with sorne glid
drive,
the 6HF5
tubes rnay be severely
damaged.
For this reason we tepeat: CAUTION
-
Do not hold the transceiver
in Trans-
mit or TUNE position
for any length
of time without
rrdiPPingri the PA
PLATE
control.
The PA GRID rnust
f i r s t b e I p e a k e d r r a s i n ( b ) , a b o v e ,
a n d t h i s r e q u i r e s s o m e c a r r i e r
s u p p l i e d a s d e s c r i b e d i n ( a ) , s o i t
can be seen that these stePs rnust be
p€rformed
quicklY.
If the PA LOAI)
control
is too far clockwise,
it lnay
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