Table of Contents
Advertisement
o
~~M~!~ATIONB
SIWAIII
DIVISION
i tion of the PASSBAND control ,
all light s
should be out.
Set the PASSBAND
control back to the 12 o'clock position.
CWN TEST
Set the MODE switch to CW, and adjust the RF generator for 50 uV output
and adjust the frequency
for a 1650 ± 20 Hz speaker audio tone.
Switch the
MODE switch to CWN and note that the S meter reading
changes by one S unit
or less.
Set the MODE switch to CW.
Adjust the
RF generator
frequency for a
2700 Hz ± 20 Hz speaker tone
and set the
RF generator output for
S9 on the
Smeter.
'furn the PASSBAND
control counterclockwise
until the S meter reading
drops to less
than S5.
At this
point, only the 2.7
andjor 2.4 PASSBAND KHZ lights should be off.
Adjust the RF generator frequency for 400 Hz ± 20 Hz tone in the speaker and
set the generator output for an S9 reading on the Smeter.
'furn
the
PASS-
BAND control clockwise
until the S meter reading drops to less than S5.
At
this point
only the
0.6 andjor 0.9 PASSBAND KHZ lights should be off.
Set
the PASSBAND control back to its 12 o'clock position.
PTO CHECK
Set the PTO MODE switch to
PTO A and adjust the RF generator for 50 uV
output.
Tune PTO A across the signal
and listen to the speaker audio tone
for any indication
of
tuning backlash.
Tune
PTO A for a 1000 Hz ± 20 Hz
tone in the speaker.
Set the PTO MODE switch
to
PTO B.
Tune
PTO B across the signal and
listen to the speaker audio tone for any indication of tuning backlash. Tune
PTO B for a 1000 Hz
±
20 Hz speaker tone.
Both PTOs are now set to the same
frequency and there should
be
no
interference between the two.
Slowly tune
PTO A back and forth while listening for a change in the audio tone.
There
should be no detectable change.
EXTERNAL SPEAKER CHECK
Connect an
external speaker to the EXT
SPKRjPHONE
jack on the rear ap-
ron of the set.
The internal speaker should mute and the added
speaker now
should have audio output.
_EX; ; . ; ; , ' ; ; ; , ; ; r E; : ; , ; : R N-, , - -AL= _L_.
0 _,
_CH_ED_K
Disconnect the RF generator from the ANTENNA connector and reconnect it
to the EXT
LO
jack on the rear apron of the unit.
Adjust the
RF
generator
frequency to 30 MHz and
approximately 0 dBm output.
Set the
MO~
switch to
LSB, Pro MODE switch to EXT,
and BAND to 15.
The
display frequency should
be the RF generator output
frequency minus 9000.0 kHz ± 0.1 kHz.
The dis-
play should
be
stabIe and tuning PTO A or PTO B should have no effect on the
display frequency.
This completes
the operational test
of theunit.
Disconneèt all test
equipment and reinstall any covers that may have been removed.
8-7
Advertisement
Chapters
Table of Contents
Troubleshooting
