Remember
the output
power
meter will
only
read half
the
power
going
out
when
operating SSB. If
the
meter read 300
watts then
it is
close to
600
watts
PEP,
unlessthe
meter is
a true active meter
circuit.
If
the amplifier is driven with
exactly the same amount of
power
in SSB
as
it was
during
tune up the output will be
at
least
the same and
normally more.
Just the wattmeter
can
not
respond fast
enough to
give
an
accurate
reading.
ALC Adjustment
and
Operation.
The ALC control
ís another way to reduce the transceiver's output
power.
Leave the ALC
disconnected and tune
the amplifier to the
desired output
level, not to exceed
maximum
plate
or
grid
current, or maximum output
power.
ïhen connect the ALC
line with the ALC adjust fully clockwise
(facing
the back of
the amplifier).
Nexl lransmit with
amplifier operating and adjust the
ALC until
the
grid
meter or output
power
starts to drop. Stop
at the
point
when the meter starts to drop.
The ALC
is now set for the desired level
of
operation.
lncreasing
the
transceiver's
power
control
should
not make any
change to the
meters
on
the amplifier
or the drive
power.
This will verify
the
ALC is
controlling the transceiver.
TROUBLE
SHOOTING.
VSWR
goes
high on the
output
meter when
tuning:
l. Try
tuning the amplifier into a
dummy
load with
the tuner
in
by-pass or direct.
If
the amplifier tunes
up ok
with
the dummy load connected,
it
could
be the tuner, feed
line
or antenna.
2, Place the
dummy
load
at the
output of
the
tuner
and tune
the antenna tuner into
the dummy
load
with amplifier in
standby.
Then
tune the amplifier
If
the VSWR reads
ok
with
the amplifier
3. Place
the dummy load
at the end of the feed line
(at
the
antenna end.).
Measure
the VSWR with
the amplifier
in
standby. If the VSWR is low
then
place
the
amplifier
into
operate and
measure
the VSWR.
If
the VSWR is low then it would
have
to be the
antenna, unless the VSWR was cause by a loose
connection.
Grid
meter goes
backward and the Ip reads forward with no
drive, amplifier
in
standby.
I
.
8l
I A
tube
has
a
filament
grid
short.
Try removing all tubes then insert.one in
at a time
2. If
the tube
arced then it could be
a
MOV shorted
on
the filament
windins of
the transformer.
3. There
could
be a shorted .01 capacitor in the bias line to
ground
Grid meter reads
higher than normal with very little
plate
current.
l. D16
is
shorted. It will
also cause the
plate
and
grid
current meter
to track
instead
of
moving
in
opposite directions.
Amplifier
blow
fuses on turn
on.
l.
Check the
tubes
for
a
short.
Remove
the connectors off the
top of each tube
and
let them hang
in the
air,
not
touching anything. The replace
the fuse and
turn on.
If
it
power
up
then there is a
shorted tube.
2
Check
the HV capacitors for
shorts. Check
rectiSring
diodes for
shorts.
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