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Theory of Operation
Synthesized Source Group Operation
For bands 16–18, the input signals of all four doubler boards are amplified and
filtered, then sent to the doubler board output.
For bands 19–30, the input signals of all four doubler boards are doubled,
amplified and filtered, then sent to the doubler board output.
Doubler board output signals for bands 2–30 create the full synthesized source
output frequency range of 10 MHz to 50 GHz.
The A7 50 GHz doubler board provides an EXT TSET DRIVE RF1 OUT signal to
the rear panel. This signal is output at a frequency range of 3.2–19 GHz for use
with an external test set. This output is terminated with a 50-ohm load on the
A8, A12, and A13 doubler boards.
The companion signal, EXT TEST SET DRIVE LO, is output from the A27 mixer
brick. Refer to
A25 Multiplier/Amplifier 26.5 Board (HMA26.5)
Refer to
here.
In bands 2–15 and 23-25, the synthesized LO input is filtered, amplified, and
passed through to the A26 splitter (4-port only). In bands 16–22 and 26-30,
the input is amplified, doubled, and filtered, then sent to the output.
Together, these signal paths create the full output frequency range of 10 MHz
to 26.5 GHz that is sent to the A26 splitter (4-port only) where the signal is
divided and sent to the A27 and A28 (4-port only) mixer bricks as the LO
signal.
Rear-Panel Interconnects
10 MHz REF INPUT
10 MHz REF OUTPUT
1. The A26 splitter (5067-4086) and N5245-20013, N5245-20022, N5245-20023, N5245-20101, and
N5245-20150 cables are only used with a legacy HMA26.5 p/n: 5087-7765. If you are unclear which
HMA26.5 assembly your PNA has installed, refer to Chapter 7 and
A26 splitter and cabling, refer to your option-model in Chapter 6
Set:" on page
6-8.
Keysight N5224A/25A Service Guide
"A27 and A28 Mixer Bricks" on page
Table 5-3
and
Figure 5-3
A BNC connector that allows an external frequency reference signal to be used to
phase lock the analyzer for increased frequency accuracy.
The analyzer automatically enables the external frequency reference feature when
a signal is connected to this input. When the signal is removed, the analyzer
automatically switches back to its internal frequency reference.
A BNC connector that allows a 10 MHz reference signal, produced by the A14
frequency reference board, to be output for use in phase locking external test
equipment.
5-23.
1
for band numbers and frequencies discussed
Figure 7-15 on page 36
"Bottom Assemblies and Cables by Option
and for details on
5-13
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Table of Contents
Troubleshooting
