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Agilent Technologies N5242A Service Manual page 129

2-port and 4-port pna-x microwave network analyzers
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PNA Series Microwave Network Analyzers
N5241A/42A
Synthesized Source Group
The built-in synthesized source generates a swept, stepped, or continuous wave (CW)
signal in the frequency ranges as listed in
signals: an LO signal and four incident signals. The LO signal and the four incident
signals are offset in frequency by the receiver IF of 7.606 MHz (at tuned frequencies below
53 MHz the IF and the offset is 2.535 MHz).
The LO signal is sent directly to the mixers in the receiver group. The incident signals are
routed to the front panel test ports and then to the device under test (DUT) as the test
signal. A portion of each incident signal is coupled off (in the signal separation group) and
sent to the mixers in the receiver group as reference signals. These reference signals are
compared (mixed) with the LO signal in the receiver group to produce the 7.606 MHz (or
2.535 MHz at frequencies below 53 MHz) IF signal.
The incident signal output power is leveled by an internal automatic leveling control (ALC)
circuit. The maximum output power level of the network analyzer at the test ports is
shown in
Table
5-1.
Refer to
"Synthesized Source Group Operation" on page
Table 5-1
Frequency Range and Maximum Output Power Level
Nominal
Output Power
Options
at Instrument
Preset
0 dBm
200
0 dBm
-5 dBm
219
-5 dBm
-5 dBm
-5 dBm
224
+5 dBm
+5 dBm
0 dBm
400
0 dBm
-5 dBm
419
-5 dBm
-5 dBm
423
-5 dBm
Service Guide N5242-90001
Maximum Leveled Output Power (in dBm)
10 MHz
50 MHz
to
to
Ports
50 MHz
500MHz
1
+8
+10
2
+13
+13
1
+8
+10
2
+13
+13
1
+7
+8
2
+13
+13
SRC 2
+9
+11
OUT 1
SRC 2
+13
+17
OUT 2
1, 3
+8
+10
2, 4
+13
+13
1, 3
+8
+10
2, 4
+13
+13
1, 3
+7
+8
2, 4
+13
+13
Network Analyzer System Operation
Table
5-1. The source group provides five
5-7.
500 MHz
3.2 GHz
10 GHz
to
to
to
3.2 GHz
10 GHz
16 GHz
+10
+13
+13
+13
+13
+13
+10
+13
+12
+13
+13
+11
+8
+13
+12
+13
+13
+10
+10
+18
+16
+14
+18
+16
+10
+13
+13
+13
+13
+13
+10
+13
+12
+13
+13
+11
+8
+13
+12
+13
+13
+10
Theory of Operation
16 MHz
20 GHz
24 GHz
to
to
to
20 GHz
24 GHz
26.5 GHz
+13
+12
+5
+10
+7
+2
+10
+8
+3
-1
+8
+7
0
+10
+7
+7
+5
-2
+15
+13
+7
+13
+12
+5
+13
+12
+5
+10
+7
+2
+10
+8
+3
+8
+7
-1
+10
+7
0
+7
+5
-2
5-5

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