94 Chapter 4
Troubleshooting the RF Section (E4446A, E4447A, E4448A)
RF Section Description (E4446A, E4447A, E4448A)
Figure 4-3 Block Diagram with RF Options - E4446A, E4447A, E4448A
Option B7J - Digital Demod Hardware. The electronic attenuator
works over the lowband frequency range of 100 kHz to
3 GHz. In bypass mode, the coax switches in the
electronic attenuator board route the RF signal on
through to the Lowband board. The electronic
attenuator path consists a 40 dB, 1 dB step solid state
attenuator.
Option 1DS - Low Band Preamp. In bypass mode, the coax switches
route the Low Band RF signal on to the Lowband
assembly. When in preamp mode the 30 dB gain, low
noise figure amplifier path is selected.
Option AYZ - External Mixing. Allows an external preselected or
unpreselected mm wave mixer to be used with the
instrument.
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