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 [INSTRPRESET]. Press [STARTFREG] and enter [6]
[.]
[4] [GHz].
Press (STOP FREQ] and enter [1] [2] [.1 [9] [GHz]. Press [POWERLEVEL] 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 OUT. Press [STARTFREQ] and enter [71[GHzJ.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 [71[GHz].The mixer IF frequency is now 600
MHz.
73. Set the Spectrum Analyzer as follows:
FULL SPAN
0
-
2.5 GHz
RES
BW
300 kHz
VIDEOBW
100kHz
START FREQ
590
MHz
STOP FREQ
800
MHz
REFERENCE LEVEL
10
dBm
ATTEN
0dB
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