TRANSMITTER TUNE-UP
The fol l owing tune-up procedure m u st be perform ed
prior to selection of desired operating mode. LSB. l 1SB.
CW . or
/1,
M_ See paragraphs relating to the specific
mode after basic transmitter tune- u p_
Connect d u m m y load or matched antenna to the coax
ial fitting on rear apron. and preset controls as fol l ows :
POWER ........................... O F F
HEATER ........................ ON
MODE
. . . . . . . . . . . _ _ _ _ _ _ _ _ _ _
......... Tl '1\JE
C A R R I E R ........................ () ( fu l ly counter-clockwise )
B
A
l\J
D
. . . . . . . . . . . . . . . . . . . . . . , _ . . . . _ .
Desired band
TUN ING
. . . . . . . . . . . . . . . . . . . . . . _ .
Desired freq uency
PRESELECTOR
_ . . . . . . . . . . _ _ _ _
Desired band segment
PLATE .............. -............ Desired band segment
LOA D ING
. . . . . . . . . . . . . . . _ _ _ _ _ _ _ _ ,
To pos ition show n in table
MET ER ........................... IC
VFO SEL ECT ...... .... ..... I N T
MOX-PTT-VOX ............... PTT
L O A DING POSITIONS
BAND
LOADING
160
- · · · · · - · · · · · · · · · · · · · · · · · · · · · · · · · · · · · .
fl
8 0
. . . . . . . . . . . . . . . . , _ , , , , , _ _ _ _ _ , , , , , _ , ,
;:j
40
.
.
. . _
.. ,, ........................... fi
1/2
20
....
.
..
. . . . .
..
. . .
..
. . . . .
.
.
.
. .
.
.
..
.
.
.
3
1/2
1 fl
, _
..
,, ........................... -.. 3
JOA
. . . . . . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ , ,
....... 1
JOB
................................. -�
lOC
..
.
.....
.
.
.
..
. . . . . .
.
.
.
.
..
· - - - · - - -
1
lOD
. . . . . . . . . . . . . . . . . . . . , _ , _ _ _ _ _ _ _ _ _ _
1
�OTE : Loading po�:itions arc n ominal. S light \' ariations
from positions shown arc to be expected.
With ·the transceiver tu rned on . al low
60
seconds for
warm - u p of the transmitter tubes. He certain that
acccssor,· plug is in the accessory socket. The heater
vol tage to the final tubes is su pplied through pins
1
and 2 of the accessory pl ug.
Set the"·
I\
10X-l'TT-
\'OX
.. switch to
\!OX
position .
wil l now read Final .-\mplifier n·sting cathode current.
This should be set at
.06 (60
mA) with the BIAS
control located under the top cover near the rear o f
the set. Switch the meter to ALC position and
adjust ALC control under the top cover for full
scale deflection of the meter. Return meter switch
to IC position and "MOX-PTT-VOX" switch t o
PTT position.
PRE-TUNING
I.
Adjust "PRESELECT" for maxim u m receiver noise
level.
2. Place "FUNCTION SWITCH" "MOX" position.
3.
Rotate "CA R R I E-R" control arm u ntil m eter rises
j u st above normal idling curren t. .06 (60
mA) .
1.
A dj u st "PR ESELECT" for m axim u m m eter reading.
( Cau tion: if meter exceed� .
1 ( 10 0
mA ). redu ce
"C A R R I E R " )
fl.
Rotate .. PLAT E .. control for minim u m m eter reading.
( Plate Dip )
6.
Return "FUNCTION SWITCH" to PTT position.
The transmitter is now pretuned to the desired fre
quency . Final peak tuning is accomplished by the
following final tuning procedure .
FIN AL TUNING
Fin al pea k tu ning u tilizes the meter rcl atiH' power
ou tpu t position ( P.O. ). At fu l l tran smit power t h e ml'lcr
wil l read approximatc l v one-ha l f to two- third s fu l l scale
into a match ed anten na load. I f during final tune- up
it is noted that the ml'ler indication exceed s fu l l sca le.
discontin u e tun e-up. O ff scal e meter indication s are the
resu lt of rdlcctl'd
RF
due to high
\'SWR
and corrcc
tin· action shou ld be taken before attempting final tune
u p.
CAUTION
Exceeding the time limits noted during
final tuning may result in destruction of
final output tubes.
1.
Set meter switch to P.O. position , rotate "CAR
RIER" control arm to position 4 .
2 . Momentarily set "FUNCTION SWITCH" to
"MOX"
( 10
second maximum) , and rotate
"PRESELECT" control for maximum m eter
reading. Return "MOX" to PTT position .
3 . Momentarily set "FUNCTION SWITCH" to
"MOX"
( 10
second m aximum) and rotate
" LOADING" control for maximum meter read
ing. Return "MOX" to PTT position .
4.
Momentarily set "FUNCTION SWITCH" to
"MOX"
( 10
second maximum) and rotate
"PLATE" control for m aximum meter reading.
Return "MOX" to PTT position .
5. Repeat steps
1
through advancing "CA R RIER"
control arm approximately two units each time
until "CARRIER" control arm is fully clockwise
(Position
10).
The transmitter is now tuned for
maximum output .
Return "CARRIER" control arm fully counter
clockwise to zero position. Return meter switch to
IC position and MODE switch to desired·operating
mode .
NOTE: Moving the "FUNCTION SWITCH" to the
"MOX" position in the above steps may be
eliminated by simply operating the micro-
-
]()
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