Keysight N9038A, Руководство по обслуживанию

Страница: 225 / 745

Keysight N9038A MXE Service Guide 225
RF Downconverter Section
RF Downconverter Section Description
RF Section Assembly Descriptions
A11 RF Switch / High Band Preamp
This assembly has 3 main functions:
— Switch RF input frequencies from 20 Hz to 3.59 GHz directly to the low
band input of the A13 RF Front End assembly.
— Switch RF input frequencies from 3.6 GHz and above to the A12 YTF
Preselector before it goes to the high band input of the A13 RF Front End
assembly.
— High band preamplifier, which has a typical gain of +30 dB and a noise
figure of approximately 9 dB up to 18 GHz, 12 dB up to 30 GHz, and 15 dB
up to 44 GHz.
Control for this assembly comes from the A15 Front End Controller assembly.
There are two different A11 RF Switch / High Band Preamp assemblies used in
the N9038A - one for instruments with Option 503, 508, or 526 and one for
instruments with Option 544.
The connections to and from the A11 RF Switch / High Band Preamp Control
assembly are as listed in Table 6-2 and as illustrated in Figure 6-1 and Figure
6-2 .
Table 6-2 A11 RF Switch / High Band Preamp Assembly Signals
Port Description To/From Cable Frequency
J1 Input SW2 Transfer Switch P4 W37 20 Hz to Max Instrument Freq
J2 Low Band Output A13 RF Front End J2 W38 20 Hz to 3.6 GHz
J3 High Band Output A12 YTF Preselector Input W39 3.6 GHz to Max Instrument Freq
J4 Bias & Control A15 Front End Controller J700 W4 N/A