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MODEL 8559A
PERFORMANCE TESTS
PERFORMANCE TESTS
4
-
20.
GAlN COMPRESSION
SPECIFICATION:
Gain compression is less than 0.5 dB for a
-
10 dBm input level with 0 dB attenuation.
DESCRIPTION:
Gain compression is measured by changing the power level at the spectrum analyzer input from
-
20 dBm to
-
10 dBm. The displayed signal level will change by less than 10 dB, indicating gain compression in the input
mixer. Since a 10-dB change in IF gain is used to keep the signal trace near the same point on the display when
the input power is increased, the error due to this IF gain change is first measured, then subtracted from the
displayed deviation to give the deviation due only to gain compression.
SPECTRUM
ANALYZER
SIGNAL GENERATOR
RF
l
OUTPUT
$
ADAPTER
POWER
METER
o
O
o
POWER
20
dB
SPL
l
TTER
(CONNECTS DIRECTLY
ATTENUATOR
TO 2OdE ATTENUATOR
D
J
ADAPTER
FIGURE
4-16,
GAlN COMPRESSION TEST SETUP
EQUIPMENT:
Signal Generator
.........................................................
HP 8640B
Power Meter
...........................................................
HP 435A/B
Powersensor
...........................................................
HP8481A
Power Splitter
.................................................
HP 1 1667A, Opt. C16
20
-
dB Attenuator
................................................
HP 8491 B, Opt. 010
Adapter, Type N (m) to BNC
(f)
(2 required).
..............................
HP 1250
-
0780
.............................................
Adapter, Type N
(f)
to N
(f)
HP 1250
-
1472