By H. Mark Bowers — I believe this exercise raises the issue of how one is to perform accurate field strength measurements at higher LTE frequencies, where there is a low-level leak from the HFC plant (especially QAM).
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By H. Mark Bowers – Newer leakage detection systems are now available that measure at dual frequencies. While {the} present FCC required leakage detection frequency range remains in the 108 MHz to 137 MHz aeronautical band, measurements at higher frequencies can be revealing and may eventually be required
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By H. Mark Bowers – In my last column we examined the importance of scalar testing, definitions of various terms, equipment required, and examined waveforms of actual insertion loss and isolation measurements using a spectrum analyzer and tracking generator.
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By H. Mark Bowers – In my last column we examined digital QAM testing requirements under present FCC Part 76 Rules and ANSI/SCTE 40 2003 Requirements. In this column we’ll begin an examination of scalar testing and why it’s important in the HFC network.
Read MoreBy H. Mark Bowers – As noted in Part One, FCC Proof-of-Performance testing is required once every six months in systems with over 1,000 subscribers: first during January or February, the ‘coldest’ months of the year; and then again during July or August, the ‘hottest’ months of the year.
Read MoreBy H. Mark Bowers – Since I often field questions regarding the measuring or interpretation of FCC Part 76 proof-of-performance (POP) rules and testing requirements, I thought it appropriate to review this subject in my next two articles. Given space limitations, we will review analog testing requirements here in Part One, and then in Part Two we’ll examine digital testing. And to keep it interesting, we’ll examine several unusual problems I discovered during recent testing trips.
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