Specifications

Receiver Module
Configurations,
MS462XA
The front end consists of the following items:
q
Non-Reversing Module
q
Port 1 Module
q
20 dB Fixed Attenuator
q
Port 1 Step Attenuator (Option 7)
q
Switched Doubler Module (6 GHz unit only)
q
Switched Tripler Module (9 GHz unit only)
The 10 MHz to 3 GHz signal from the Source Module is routed to the
Non-Reversing Module. For operation between 3 to 6 GHz, the signal fre
-
quency is doubled in the Switched Doubler Module prior to sending it to
the Non-Reversing Module.
In the Non-Reversing Module, one coupler provides a signal path that
feeds the Reference input of the Down Conversion Module and another
coupler provides a signal path for the built-in level detector that provides
a DC signal for the ALC circuits located in the Source Module.
The stimulus signal is then output to the DUT via the Port 1 Module
mounted directly to the Port 1 front panel connector. The Port 1 stimulus
signal can be attenuated in 10 dB steps via the optional 0 to 70 dB Step
Attenuator that is part of the Port 1 source signal path.
The reflected and transmitted device-under-test (DUT) signals are re-
ceived via Port 1 and Port 2 connectors simultaneously. The reflected sig-
nal is routed via the coupled arm of the coupler in the Port 1 module to
the Down Conversion Module. The transmitted signal is attenuated to a
proper level by the 20 dB fixed attenuator at the Port 2 signal path and is
then routed to the Down Conversion Module.
Receiver Module
Configurations,
MS462XB
The basic front end consists of the following items:
q
Auto-Reversing Module
q
Port 1 Module
q
Port 1 Step Attenuator
q
Port 2 Module
q
Primary Switched Doubler Module
The 10 MHz to 3 GHz signal from the Source Module is routed to the
Auto-Reversing Module. For operation above 3 GHz, the signal is doubled
in 6 GHz models or tripled in 9 GHz models prior to sending it to the
Auto-Reversing Module.
In the Auto-Reversing Module, a coupler provides a signal path for the
built-in level detector that provides a DC signal for the ALC circuits lo
-
cated in the Source Module. Then the source signal is switched between
two paths and routed to the front panel Port 1 and Port 2 connectors,
respectively. The switching is controlled by the Central Processor Module
to set the direction of the signal flow for the desired test:
Port1=Forward
Port 2 = Reverse
THEORY OF OPERATION FRONT END RF COMPONENTS
MS462XX MM 2-17