Keysight N9038A MXE Service Guide 227
RF Downconverter Section
RF Downconverter Section Description
A12 YTF Preselector
The YTF Preselector is used for input frequencies of 3.6 GHz and higher. The
YTF Preselector is a YIG tuned bandpass filter whose main purpose is to
eliminate unwanted mixing products. When the YTF is properly aligned, the
tunable bandpass filter will track the instrument's current input frequency. The
YTF Preselector has a 3 dB bandwidth greater than 40 MHz and an insertion
loss of approximately 6.5 dB.
Control for this assembly comes from the A15 Front End Controller assembly.
There are two different A12 YTF Preselector 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 A12 YTF Preselector assembly are as listed in
Table 6-3 and as illustrated in Figure 6-3 and Figure 6-4.
Table 6-3 A12 YTF Preselector Assembly Signals
Port Description To/From Cable
Input Input A11 RF Switch / High Band Preamp J3 W39
Output Output A13 RF Front End J9 W40
J1 Bias & Control A15 Front End Controller J300 W12
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