5-16.
LEVELED RF OUTPUT ADJUSTMENTS
(Cont’d)
I I
—
— — —
— —
A.
TYPICAL DET WAVEFORM
B. TYPICAL MOD LVL WAVEFORM
ADJUST TO
THIS POINT
C.
TYPICAL MOD LVL MINUS DET WAVEFORM
Figure 5-56.
Typical MOD L VL and DET Waveforms for ALC Loop Gain Adjustment
NOTE
In steps 25 through 29, the oscilloscope display will be adjusted for the
most horizontal line. This adjustment is only concerned with the trace up
to where it deviates from a flat line (see Figure 5-56, Waveform C). This
point on the display will change position with frequency.
25. On the oscilloscope, invert CHAN B and select DISPLAY A+B mode. Using
the OUT’s step keys,
step the CW frequency through Band 0 from
10 MHz
to 2.21 GHz and adjust A26R43 (HET) for the
most horizontal line across Band 0.
26. On the OUT, press [CW] [2]
[.]
[3] [GHz]. Using the OUT’s step
keys, step the
CW
frequency
through Band 1 from 2.3 to 6.9
GHz and adjust A26R45 (Xl) for the
most horizontal line across
Band 1.
5-108
Adjustments
HP 8340B/41B