Figure ST
ABHO7 here.
Figure
7-25.
Stable
HI
OUT
Signal
in
FRA
CN
TUNE
Mode
A7
Pulse
Generator
Check
with
Oscilloscope
P
erform
this
c
hec
k
if
a
sp
ectrum
analyzer
is
not
a
v
ailable.
1.
Remo
v
e
the A4-to-A11
SMB
cable
from
the
A4
(R)
sampler/mixer
output.
Connect
the
oscilloscop
e
to
the
A4
output
(1st
IF).
2.
Activ
ate
the
FRA
CN
TUNE
service
mo
de
and
tune
the
fractional-N
to
50
MHz.
Press
4
SYSTEM
5
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
SERVICE
MENU
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
SERVICE
MODES
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
FRACN
TUNE
ON
4
50
5
4
M/
5
.
3.
Activ
ate
the
SR
C
TUNE
service
mo
de
of
the
analyzer
and
tune the
source to
50
MHz.
Press
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
SRC
TUNE
ON
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
N
N
N
N
N
SRC
TUNE
FREQ
4
50
5
4
M/
5
.
4.
Set
the
SR
C
TUNE
frequency
to
those
listed
in
T
able
7-7
and
observe
the 1st
IF
w
av
eforms.
They
should
app
ear
similar
to
Figure
7-26
.
If
the
signals
observ
ed are
proper,
contin
ue with
\A11
Phase
Lo
c
k
Chec
k."
If
the
signals
observ
ed
are
questionable,
use
asp
ectrum
analyzer
to
p
erform
the
preceding \A7 Pulse Generator Chec
k with Sp ectrum Analyzer."
Table 7-7. 1st IF W
aveform Settings
SR
C TUNE
FRA
CN
Harmonic 1st
IF
50 MHz 50 MHz 1 1 to 6 MHz
250 MHz 50 MHz 5 1to
6 MHz
2550 MHz 50 MHz 51 1 to 6 MHz
7-30 Source Troubleshooting DRAFT
3/21/106 15:13
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