Yaesu FT-902DM User Manual

Che distortion produced by RF envelope clipping
and filtering is less objectionable than that caused
by an equivalent amount of audio clipping. RI
clipping causes no increase in the peak power
output, but it do&és clip the peaks of the voice
waveform so as to increase the average powe!
output,
With the processor switch (located immediately
to the left of the PROC LEVEL control) in the
OFF position (not depressed), set the METER
switch to the ALC position, Speaking at a normal
level.
set
the
MIC
GAIN
control
to
the
level
where
the meter indication stays In the green partion of
the meter scale. Press the processor switch and
idjust the PROC LEVEL control to the position
Where the ALC indication stays in the green por
tion of the meter scale while speaking in a normal
voice. Optimum setting of the MIC GAIN and
PROC LEVEL controls may require observation
of
the
transmitted
signal
using
an
oscilloscope.
PROCESSOR OFF
CW OPERATION
Note
The
Curtis
8044
IC
Keyer
Unit
is
built-in
on
the
FT-902DM/DE,
and
is
an
available
option
on
the
FT-902D/SD
models.
For electronic keyer operation, insert a three con
ductor plug attached to a keyer paddle into the
KEY
jack
on
the
rear
apron.
Keyer
speed
may
then
be
adjusted
by
varying
the
KEYER
control
on the front panel.
For
straight
key.
bug.
or
external
electron
kevel
KEYER
control
fully
counter
clockwise
into
the
click-stop:
The
desired
key
line
use rotate the
may
then
be
inserted
into
the
KEY
jack.
Refer
to
the
drawings
on
page
9
for
détails
of
the
proper
key line plug wiring
The
transmitter
may
be
activated
on
CW
by
MOX,
PTT.
or
by
VOX
(semi-break-in)
as
desired,
The
key-up
voltage
across
the
key
terminals
ts
7
volts
while
the
key-down
current
is
1.5
mA,
so
most
the
external
electroni¢
kevers
may
be
used
with
FT-902DM
without
modification
The
operator
may
select
any
power
OUTPUT
desires
by
advancing
the
CARR
control
as
desired
NOTE
Insertion
of
the
key
plug
automatically
disconnects
the
bias
supply
to
the
PA
tubes.
Therefore,
bias
current
sill
nol
he
indicated
when
the
METER
switch
is in the IC position
AM OPERATION
AM operation of the transmitter is accomplished
by setting the MODE switch to the AM pasition
and inserting the proper amount of carrier with
the CARR control
After completing basic transmitter tune-up, plac
the MODE switch in the AM position, Activate
the transmitter, and rotate the CARR control
until the meter reads .10. (100 mA) in the LC po-
sition of the METER switch, While speaking into
the microphone in a normal voice, increase the
MIC
GAIN
control
until
the
meter
indicates
very
slight movement with voice peaks, Care must be
exercised that the CARR control is not advaneed
too far. Do not exceed .10 (100 mA) meter indi-
caution during AM operation or damage to the
transmitter final amplifier tubes may result.
For AM reception, an AM filter is available as an
Option,
PSK OPERATION
After completing basic transmitter tune-up, place
the MODE switch in the FSK position. The PSK
terminal inpul may be connected to the FSK jack

Yaesu FT-902DM Specifications

General

Brand	Yaesu
Model	FT-902DM
Category	Transceiver
Language	English