User's Manual Part 1

AT7400 Owner Manual Rev. 2.0 – October 2006-10-23 Section 6 - 8/11
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6.6.1. Module 4428 – UHF Low Pass Filter
Fig.6.9: UHF low pass filter
The module 4428 is a 7/8” rigid transmission line, no tuning points. Depending of the UHF assigned band the filter is
specified as:
x P/N 21802 for Channels 14 up to 39: …….....416.5 mm.
x P/N 23045 for Channels 40 up to 69: …….….373.3 mm.
These filters have NO adjustment to be done. Pay attention for mechanical damages that may occur on the main
line, or also on the IN/OUT connectors.
Fig.6.10: Module 4428 frequency response