Descriptions
The 89411A is a fixed downconverter used to translate the 21.4 MHz IF
output on several Agilent Technologies RF/microwave spectrum analyzers
to a baseband frequency within the range of the 89410A. It translates the
entire IF bandwidth to a baseband frequency centered at 5.6 MHz, The
conversion gain of the 89411A can be varied to be compatible with several
different spectrum analyzers.
The following describes elements appearing in the front and rear panel
illustrations, the block diagram, and the setup diagram (on the next page).
(rear) The IF Input connector. This is a 21.4 MHz signal from the rear
panel of an RF or microwave spectrum analyzer. The input signal level
should be approximately −20 dBm to achieve optimum performance from
the 89411A.
(front) The Output connector provides a 5.6 MHz signal that goes to
the Channel 1 input connector on the Agilent 89410A Vector Signal
Analyzer. This signal should be approximately −15 dBm. The
downconversion gain step attenuator may be adjusted to change the
gain.
(rear) The Reference Input connector accepts a 10 MHz reference
signal from the RF or microwave spectrum analyzer.
(rear) The Reference Output connector provides a 10 MHz reference
signal that goes to the Agilent 89410A Vector Signal Analyzer.
(rear) The downconversion gain switch controls a step attenuator
which allows you to adjust the total gain of the downconverter from +5
dBm to −15 dBm in 5 dB steps, the goal being an output of approximately
−15 dBm. When the IF Input level is −20 dBm, an attenuator setting of 0
dB yields an output level of −15 dBm.
(front) The Reference Unlocked indicator. This indicator lights when
the 10 MHz reference input signal at is <0 dBm, or when there is a
malfunction in the 89411A local oscillator.
15-3
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