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OCUBIC
COMMUNICATIONS
SIIWAJItI
DIVIBION
Set the MODE switch to CW,
the BRK IN switch to FULL, the CW HARD-SOFT
switch to HARD.
Key and unkey the unit rapidly several times;
the receiver
audio should return the instant the unit is unkeyed.
There should be no ob-
jectionable pops or clicks from the speaker
when keying or unkeying at any
power output setting.
Set the
BRK IN
switch to
SEMI.
Key and unkey
the
unit several times.
There should be a
0.5
to
6
second delay between un-
keying
and receiver turn on
that varies
with the setting
of the CW DELAY
trimpot (R174) on the audio board.
Set the BRK IN switch to FULL, key the
unit,.and adjust the MIC GAIN control for a
reading of 75
on the meter with
the METER
switch
in the
ALC
position.
Rapidly key
and unkey the unit and compare the oscillo-
scope display to the illustration presented
here, to check for proper waveshaping.
Set
the
CW HARD/SOFT
switch to
SOFT and make
the same check for waveshape.
The
SIDETONE
trimpot
(R124)
on the
audio board should vary the
level of the
audio tone
heard in
the speaker when
the
"Hard" keying
transmitter is
keyed.
The tone
should be
present only in
the CW or CWN
MODE of op-
eration,
and should not
be heard with the
unit unkeyed.
Output
shouldvary from no
output
to approximately 1 watt
of
audio
with the setting of the sidetone level con-
trol.
Connect
one lead
of a 12 volt
lamp
(less than
200
ma) to
+12 volts from the
"Soft" keying
power supply and connect
the
other lead
from
the lamp to the center contact on the
EXT RL Y jack on the rear apron of the unit.
The lamp should light only when the unit is
in transmit in any mode.
RECEIVER OPERA
TI
ON
Disconnect the microphone,
the SPST switch,
wattmeter,
"T" connector
and attenuator, and the dummy load from the unit.
Connect an RF signal gen-
erator to the ANTENNA
jack.
Connect
an
AC voltmeter and frequency counter
across the speaker terminals.
Set the MODE switch to USB, VOX/PTT switch to
PTT, MIC GAIN control fully counterclockwise, and PTO MODE to PTO A.
Check for 0.35 uV sensitivity at 10
dB
S-+N/N ratio on all bands.
See
the "Servicing Hints"
section of this manual
for the procedure.
Check the
sensitivity with the PTO MODE switch in the PTO B position also.
Check that
the sensitivity
is better than 1.0 uV at
10
dB
S+N/N ratio with the
input
voltage set at llV
De
on all bands.
Set the RF generator output to 1 uV and note the S meter reading.
Tune
the unit
to each internally generated
spurious signal
and note
that they
each should be less than the S meter rea,ding noted a bove.
Check that the
S meter
reads S 9± 1 S unit for 50 uV input signal at
a supply voltage of 13.8 V DG.
The S meter reading should vary with the in-
put signal.
Changing the input signal from
1 uV to 0.1 V should result in
6
dB
or less increase . in audio output (6
dB
is a voltage ratio of 2).
The
8-5
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Troubleshooting
