Specifications

The85309LO/IFdistributionunitinterfaceswiththePNA,PNA-Xintwodifferentways,
providing either a 20 MHz IF signal for PNA and PNA-X or an 8.33 MHz for PNA, a
7.606534 MHz for PNA-X and PNA-X measurement receiver IF signal. It is important to
understand the differences in each configuration before setting up your measurement.
85309B with PNA configured with Options 014 and 080 or PNA-X Option 080
With this setup, the PNA or PNA-X operates in frequency offset mode and the 85309B
mustcreatea20MHzIFsignal.Thereceiverissetto20MHzandtheRFandLO
sources must be offset by 20 MHz. The test and reference signals are inserted through
the front panel links, bypassing the internal coupler. This configuration improves the
noise floor by approximately 10 to 38 dB, depending on frequency. However, operation in
frequency offset modes results in a decrease of frequency stepping speed.
85309B with PNA configured with Options 014, 080, 081, UNL, and H11
Withthissetup,the85309Bmustcreatean8.33MHzIFsignal.TheRFandLOsources
must be offset by 8.33 MHz. Normal operation of the PNA automatically offsets the
internalLO8.33MHzfromtheinternalRF.Above20GHzthePNAswitchesto3rd
harmonicmodesothatRF–3*LO=8.33MHz.Thisconfigurationallowsthe85309B
IF output to be connected to the PNA H11 rear panel IF inputs, bypassing the first PNA
mixer. This configuration provides the best sensitivity.
85309B with PNA-X configure with Option 020 and 080
Withthissetup,the85309Bmustcreatea7.605634MHzIFsignal.TheRFandLO
sources must be offset by 7.605634 MHz. Normal operation of the PNA-X automatically
offsetstheinternalLO7.605634MHzfromtheinternalRF.Thisconfigurationallowsthe
85309B IF output to be connected to the PNA-X option 020 rear panel IF inputs, bypass-
ing the first PNA-X mixer. This configuration provides the best sensitivity.
85309B with PNA-X Measurement Receiver
Withthissetup,the85309Bmustcreatea7.605634MHzIFsignal.TheRFandLO
sources must be offset by 7.605634 MHz. PNA-X measurement receiver option 108
automatically offsets 7.605634 MHz from the external RF when operates in couple mode.
This configuration allows the 85309B IF output to be connected to the rear panel IF
inputs. This configuration provides the best sensitivity and lower cost.
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