5-16.
LEVELED RF OUTPUT ADJUSTMENTS
(Cont’d)
40. Set the spectrum analyzer for FULL SPAN of 0-2.5 GHz. Set RES BW for 300 kHz. Set VIDEO BW
for 100 kHz. Set START FREQ to 590 MHz. Set STOP FREQ to 800 MHz. Set REFERENCE LEVEL
to —10 dBm. Set ATTEN to 0 dB. Press HOLD to retain these settings. The 600 MHz IF signal
should be near
the left side of the spectrum analyzer CRT.
41.
Using the
[a.]
key on both the OUT and the LO, step through Band 2 observing the spectrum
analyzer display at each step. There may be signals due to mixing products, and/or squegging.
Mixing products will appear as low level signals. Squegging signals will appear as a higher ampli-
tude signal as shown in Figure 5-60. If squegging occurs, adjust A24R5 (X2C) slightly CCW to
eliminate the squegging. Note, if the control is adjusted and there is no effect on the signal, the
signal is probably a mixing product.
NOTE
Test for squegging at power levels from maximum leveled power to —20
dBm in 5 dB increments.
OUT
SYNTHESIZED SWEEPER
(LOCAL OSCILLATOR)
42. On the OUT, press [SHIFT] [PWRSWP] and enter the maximum ALC power level that will be a 5
dB increment below max leveled
power
(i.e., 15,10,
5). Repeat step
41
at
this power level. Enter
the next 5 dB increment and repeat step 41 until the test for squegging has been performed from
maximum leveled power to —20 dBm.
43. For Band 3, press the LO [STARTFREQ] and enter [1][2]
[.]
[9] [GHz].Press [STOPFREQ] and
enter [1] [9]
[.]
[4]
[GHz].
Press [MANUAL] and enter [1] [2]
[.]
[9] [GHz].
Figure 5-59.
Leveled Squegging Test Setup
5-112
Adjustments
HP 8340B/41B