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2. MULTI-PIN CONNECTOR supplies the necessary DC voltage (from the analyzer) for the operation of the
HP R85026A, and feeds the detector output signal to the network analyzer.
1. RF INPUT CONNECTOR {WR 28 waveguide) accepts the RF signal.
Figure 2-1.
HP R85026A Features
OPERATING THEORY
The HP R85026A detects and adapts an input signal in the frequency range of 26.5 to 40 GHz that is either
an unmodulated RF signal (DC detection mode) or a squarewave amplitude modulated RF signal (AC
detection mode) so that it can be displayed on the HP 8757A scalar network analyzer. In either AC or DC
detection mode, the detector provides a 27.778 kHz squarewave signal for the analyzer to interpret and
display.
In AC detection, an RF or microwave signal is amplitude modulated with a 27.778 kHz squarewave. The
HP R85026A demodulates (envelope detects) the signal to produce a 27.778 kHz squarewave whose peak-
to-peak voltage corresponds to the RF signal magnitude at the detector input. This signal is amplified
and passed to the analyzer.
In the DC detection mode, no modulation is required. The HP R85026A detector converts the RF signal
to a proportional DC voltage that is then chopped at a 27.778 kHz rate. This chopped signal is amplified,
and passed to the network analyzer.
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