Do not e x ceed 1 0 seconds of key-down time while
tuning.
As well , be certain that the ACC plug is inserted
into the rear apron ACC jack . Without this plug,
there will be no p ower applied to the tube heaters .
Heater voltage is applied through pins 1 and 2 of
the accessory socket .
( 1 ) Preset the controls and swit ches as follows :
MODE . . . . . . . . . . TUNE
DRIVE . . . . . . . . . Fully counterclockwise
DELAY . . . . . . . . . Fully counterclockwise
MIC GAIN . . . . . . . Fully counterclockwise
COMP LEVEL . .. Fully counterclo ckwise
HEATER . . . . . . . . ON
PROC . . . . . . . . . . OFF
PO/IC/ ALC . . . . . . IC
PLATE . . . . . . . . . Set to desired band seg
ment
LOADING . . . . . . . 0
PRE SELECT . . . . . Peaked on re ceive for
maximum response
TX CLARIFIER . . OFF (button not pushed)
(2) Tum the HEATER swit ch ON, and wait
minute for the tube heaters to warm up .
(3) Set the VOX GAIN swit ch to the MOX
position . Ob serve the re ading on the IC
meter : it should read 50 mA with no drive
applied. If it is not, adjust the rear panel BIAS
control for a resting current of 50 mA on the
IC meter. Be certain that the DRIVE control
is fully counterclockwise for this adjustment .
(4) Set the VOX GAIN swit ch to MOX. Advan ce
the DRIVE control for a reading of 1 5 0 mA.
( 5 ) Peak the PRE SELECT control for a maximum
meter reading . If the meter reading exceeds
150 mA, reduce the setting of the DRIVE
control .
(6) Rotate the PLATE control for a minimum
reading ( "dip") on the IC meter. Return the
transceiver to the receive m ode by rotating
the VOX GAIN swit ch out of the M OX
position .
FINAL TUNING
Final transmitter tuning uses the relative power
output setting of the METER swit ch. At full rated
output , using a 50 ohm load , the PO m eter will
indicate bet ween 1 /2 and 2 /3 of full scale deflec
tion. If the PO reading is too high (off scale) or
too low ( 1 /4 scale or less) , and if the load
impedance is very close to 50 ohms, the PO ADJ
control on the rear apron may be varied to provide
the proper deflection . Once the PO meter is
calibrated, off-scale deflection s are the result of
reflected po wer (high SWR), and corre ctive action
may be required in the antenna system.
-13 -
Set the controls as follows for final tuning :
( 1 ) Set the METER swit ch to PO . Rot ate the
DRIVE control to the 9 o 'clo ck position.
( 2 ) Rotate the VOX GAIN control to t he MOX
position , and rotate the PRESELECT control
for a maximum meter reading.
( 3 ) Rotate the LOADING control for a m aximum
m eter reading . Rotate the PLATE control
for a maximum meter reading .
(4) Again rotate the LOAD ING control and
PLATE control, each time advancing the
DRIVE control approxim ately 2 steps, until
the DRIVE control is fully clockwise . The
transmitter is now tuned for m aximum power
output . Do not exceed the m aximum tuning
time stipulated previously . Return the VOX
GAIN swit ch to the VOX position (out of the
MOX position) , return the M ETER swit ch to
IC, and return the DRIVE control to the fully
counterclockwise position .
SSB OPERATION
After completing the ab ove tuning pro cedure , set
the M ODE swit ch to U SB or LSB as desired. Set
the VOX GAIN control to PTT, and activate the
t ransmitter by pushing the microphone PTT swit ch
or the footswit ch, if used . With the METER swit ch
set to the ALC positio n , speak into the microphone
in a normal voice . Advance the M IC GAIN control
until the meter kicks up to the midscale of the
green-colored portion of the meter scale .