HP 8340B Manual page 286

5-14.
UNLEVELED RF
OUTPUT ADJUSTMENTS (Cont'd)
70.
Connect equipment as shown
in
Figure 5-43. Connect the mixer at the Local Oscillator's (LO) RF
output connector
to obtain maximum mixer
LO input level. Set the LO and spectrum analyzer
to
external standard. Allow at
least 30 minutes warm
up time.
71.
Press the Local Oscillator
[INSTR PRESET], Press [START FREQ]
and enter
[6] [.] [4]
[GHz].
Press
[STOP FREQ]
and enter [1] [2] [.] [9] [GHz]. Press [POWER LEVEL]
and enter [1] [0]
[dBm]. Press [SHIFT] [CF]
and
enter [1] [0] [0] [MHz]
for
a
step size of
100
MHz.
Press
[MANUAL] SWEEP
and enter
[6]
[.]
[4] [GHz]
to set the Local Oscillator to
CW
at
6.4 GHz. Press
[PEAK]
to
turn on peaking.
72. Press [INSTR PRESET]
on the
DUT. Press
[START
FREQ] and enter [7] [GHz]. Press [STOP
FREQ]
and enter [1] [3] [.] [5] [GHz], Press [POWER LEVEL]
and enter
[2] [0] [dBm].
UNLEVELED
indicator should be on. Press
[SHIFT] [CF]
and
enter [1] [0] [0] [MHz]
for
a
step size
of 100
MHz.
Press
[MANUAL] SWEEP
and
enter [7] [GHz], The mixer IF
frequency is
now 600
MHz.
73. Set the Spectrum Analyzer as follows:
FULL SPAN
......
RES BW
..........
VIDEO BW
.......
START FREQ
......
STOP FREQ
.......
REFERENCE LEVEL
ATTEN
...........
0
-
2.5 GHz
...
300 kHz
100 kHz
,.
590 MHz
, .
800 MHz
, .
-10 dBm
,..,.-OdB
Press HOLD
to retain these settings.
The 600
MHz
IF signal
should be near the
left side
of the
Spectrum Analyzer CRT.
600 MHz IF
Example of
squegging
Figure 5-44. Unleveled Squegging Displayed
on Spectrum Analyzer
HP 8340B/41B
Adjustments
5-87