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Overview
Looking at the Block
Diagram
Block Diagram
HP 70427A Microwave Deck Assembly
HP 70427A Microwave Deck Assembly
The HP 70427A Microwave Downconverter offers several functions
dependent on input frequency and level. The input frequency range is 5 MHz
to 26.5 GHz, with an input level range of –30 to +30 dBm. This range may
be extended from 26.5 GHz to 110 GHz by using the HP 11970 family of
millimeter harmonic mixers in external application.
Linear frequency downconversion is available for microwave signals
between 1.5 GHz and 26.5 GHz. An input signal, between –30 dBm and
+30 dBm is mixed with step reference function generated by the HP 70428A
deck circuitry to produce an intermediate frequency (IF) between 300 MHz
and 900 MHz. The IF signal is then amplified in a switched gain linear IF
amplifier. The amplified signal can then be monitored (using the IF VIEW
selection of the RF/microwave spectrum analyzer monitor port), AM
detected (using the IF amplifier AM detector), or phase noise can be
measured on the IF output (using an HP 3048A Phase Noise System).
Input signals between 5 MHz and 1.5 GHz can be amplified directly by the
IF amplifier. The input range is –30 dBm to +30 dBm. The amplified signal
can then be monitored (using the IF VIEW selection of the RF/microwave
spectrum analyzer monitor port), AM detected between 50 MHz and 1.5
GHz (using the IF amplifier AM detector), or phase noise can be measured
on the IF output (using an HP 3048A Phase Noise System).
AM Noise may be measured using the internal diode detector. The input
frequency range is from 5 MHz to 26.5 GHz, with an input level requirement
of 0 dBm to +30 dBm.
The spectrum analyzer monitor switching allows one analyzer with adequate
frequency range and performance to view the main input signal, view the IF
amplifier output, and measure the RF frequency offset range in the HP
3048A Phase Noise System, without recabling the measurement setup. The
frequency range of the input view function (VIEW IN) is DC to 26.5 GHz.
The IF view function (VIEW IF) covers the IF frequency range, 5 MHz to
1.5 GHz. The HP 3048A RF analyzer function (VIEW –) covers the HP
3048A requirement of 100 kHz to 40 MHz.
2.4 GHz to 25.8 GHz Microwave Stepped Reference
The 2.4 GHz to 25.8 GHz step reference output is identical to the main
output of an HP 70428A Stepped Source. The output is made available to the
front panel via a DC to 26.5 GHz SPDT switch connecting it to the step
reference output amplifier. The step reference output is necessary for
calibration of the step reference output level into the downconversion mixer
13-50 HP 70427A/HP 70428A User's Guide
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