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8. 21.4 MHz
Bandwidth Filter
Adjustments
Reference
Related Performance
Tests
Description
8. 21.4 MHz Bandwidth Filter Adjustments
IF-Display Section
IF Gain Uncertainty Test
Resolution Bandwidth Switching Uncertainty test
Resolution Bandwidth Selectivity Test
First the LC Filters (100 kHz to 3 MHz bandwidths) on the A4A4
Bandwidth Filter are adjusted. The crystal filter poles (3 kHz to 30
bypassing all but one pole at a time and adjusting the active pole.
Next, the LC filters and the crystal filter poles on the A4A8
Attenuator-Bandwidth Filter are adjusted in the same manner as on
the A4A4 Bandwidth Filter.
Last, the 10 dB and 20 dB attenuators on the A4A8 Attenuator-
Bandwidth Filter are adjusted for the proper amount of attenuation.
This is done by connecting the CAL OUTPUT signal to the RF INPUT
through two step attenuators, keying in the necessary reference level
to activate the 10 dB and the 20 dB control lines, adjusting the step
attenuators to compensate for the attenuation, and adjusting the
attenuators for the proper amount of attenuation.
SPECTRUM ANALYZER
ATTENUATOR
ATTENUATOR
Figure 3-40. 21.4 MHz Bandwidth Filter Adjustments Setup
I
DIGITAL VOLTMETER
Adjustments 3-77
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