Filter
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RF signal is amplified, then doubled in frequency.
From the doubler, the 20 to 40 GHz RF signal is
routed by PIN switches to the bandpass filters.
There are three bandpass filter paths to provide
good harmonic performance. The frequency ranges
of the three paths are 20 to 25 GHz, 25 to 32 GHz,
and 32 to 40 GHz.
After routing through the appropriate bandpass fil
-
ter path, the 20 to 40 GHz RF signal is multiplexed
by the PIN switches to the SDM output at connector
J2. RF signals input to the SDM of £20 GHz are
multiplexed through by the PIN switches to output
connector J2.
Source
Quadrupler
Module
The source quadrupler module (SQM), found in
>40 GHz models, is used to quadruple the funda
-
mental frequencies of 10 to 16.25 GHz to produce
RF output frequencies of 40 to 65 GHz. The RF sig-
nal inputs for the SQM come from the switched fil-
ter assembly. The modulator control signal for the
SQM is received from the A14 SDM, SQM Driver
PCB where it is developed from the ALC control sig-
nal. The A14 PCB also supplies the amplifier bias
voltage(s) for the SQM.
50 GHz Models (SQM P/N D28185)
During CW or swept frequency operations in the 40
to 50 GHz frequency range, the 10 to 12.5 GHz RF
signal input is quadrupled and amplified, then goes
to the modulator. The modulator provides for power
level control and amplitude modulation of the RF
output signal. From the modulator, the 40 to
50 GHz RF signals goes via a band-pass filter to out
-
put connector J3 of the forward coupler. Note that
on the 40 to 50 GHz SQM (P/N D28185), the for
-
ward coupler is an integral part of the SQM. The
0.01 to 40 GHz (0.5 to 40 GHz for 682X5B/683X5B
models) RF output signals from the SDM are routed
to input connector J2 of the SQM forward coupler.
The 0.01 to 50 GHz (0.5 to 50 GHz for the 682X5B/
683X5B models) RF output signals go from J3 of the
SQM forward coupler to the directional coupler.
60 GHz Models (SQM P/N 60-141)
During CW or swept frequency operations in the 40
to 60 GHz frequency range, the 10 to 15 GHz RF
signal input is quadrupled and amplified, then goes
to the modulator. The modulator provides for power
level control and amplitude modulation of the RF
output signal. From the modulator, the 40 to
682XXB/683XXB MM 2-29
FUNCTIONAL RF DECK
DESCRIPTION ASSEMBLIES