HP 8340A Service Manual page 227

A46 1 GHz LOW PASS FILTER CIRCUIT DESCRIPTION
The A46 7 GHz Low Pass Filter is connected by coaxial cables
between the A45 Pre-leveler and the A48 YO Loop Sampler.
used to filter out the harmonics of the coupled-back portion of
the YO Output from the Pre-leveler to prevent
products in the Sampler.
Model 8340A - Service
A46 7 GHz LOW PASS FILTER
Scans by HB9HCA and HB9FSX
It is
unwanted mixing
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