Yaesu FT-101E - TRANSMITTER TUNE-UP; PRE-TUNING; FINAL TUNING

TRANSMITTER TUNE-UP
The following tune-up procedure must be performed
prior to selection of desired operating mode, LSB, USB,
CW, or AM. See paragraphs relating to the specific
mode after basic transmitter tune-up.
Connect dummy load or matched antenna to the coax-
ial fitting on rear apron, and preset controls as follows :
POWER oo cecseccesseceseeeeees OFF
HEATER 0... ccccceceeseeees ON
MODE. hsatticeieteecat TUNE
CARRIER uu... eee 0 (fully counter-clockwise )
BAND uu. ceeeceeeesesesceseneoees Desired band
TUNING oo. eecceee eee Desired frequency
PRESELECTOR ............... Desired band segment
PLATE sj sbivcccreeitichiceseleces Desired band segment
LOADING uu. eeeeeeeeee To position shown in table
ME PER eieitecteccivieoraetedss IC
VFO SELECT ......0.000. INT
MOX-PTT-VOX ...... cece PTT
LOADING POSITIONS
BAND LOADING
160) 2. lee Sh 5
NOTE : Loading positfgns are nominal. Slight variations
from ek ae are to be expected.
With the transceiver turned on, allow 60 seconds for
warm-up of the transmitter tubes. Be certain — that
accessory plug is in the accessory socket. The heater
voltage to the final tubes is supplied through pins 1
and 2 of the accessory plug.
Set the” MOX-PTT-VOX ” switch to MOX position. Meter
will now read Final Amplifier resting cathode current.
This should be set at 6Q mA with the BIAS control
located under the top cover near the rear of 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 to PTT position.
PRE-TUNING
1. Adjust “PRESELECT” for maximum receiver noise
level.
2. Place “MOX-PTT-VOX” switch “MOX”’ position.
3. Rotate “CARRIER” control arm until meter rises
just above normal idling current. ( 60 mA)
4. Adjust “PRESELECT” for maximum meter reading.
(Caution: if meter exceeds .1 (100 mA), reduce
“ CARRIER”)
5. Rotate “PLATE” control for minimum meter reading.
(Plate Dip)
6. Return “MOX-PTT-VOX” switch to PTT position.
The transmitter is now pretuned to the desired frequency.
Final peak tuning is accomplished by carefully following
the final tuning procedure.
FINAL TUNING
Final peak tuning utilizes the meter relative power
output position (P.O.). At full transmit power the meter
will read approximately one-half to two-thirds full scale
into a matched antenna load. If during final tune-up
it is noted that the meter indication exceeds full scale,
discontinue tune-up. Off scale meter indications are the
result of reflected RF due to high VSWR and correc-
tive action should be taken before attempting final tune-
up.
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 “ CARRIER "
control arm fully clockwise to position 10.
2. Momentarily set “ MOX-PTT-VOX ” switch to “ MOX"
(10 second maximum), and rotate “ PRESELECT”
control
for
maximum
meter
reading.
Return
“
MOX”
to
PTT
position.
aw
(10
second
maximum)
and
increase
or
decrease
“LOADING”
control
for
maximum
meter
reading.
Return
“MOX”
to
PTT.
position.
4.
Momentarily
set
“
MOX-PTT-VOX
™
switch
to
“
MOX
”
(10
second
maximum)
and
increase
or
decrease
“PLATE”
control
for
maximum
meter
reading.
Re-
turn
“MOX”
to
PTT
position.
.
Repeat
steps
3
and
4
until
maximum
meter
reading
wn
is obtained.
The transmitter is now tuned for maximum output.
Return “CARRIER” control arm fully counter-clock-
wise to zero position. Return meter switch to IC posi-
tion and MODE switch to desired operating mode.
NOTE: Moving the *“MOX-PTT-VOX” switch to the
“MOX” position in the above steps may be
eliminated by simply operating the microphone
PTT switch when microphone is attached to
the transceiver.
aN
.
Momentarily
set
“
MOX-PTT-VOX”
switch
to
“
MOX"
RT ee OL Se ee SETS