HP 8340B Manual page 193

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