By H. Mark Bowers – using this standing wave method to estimate DTF can be quite accurate if measured at lower frequencies, especially in the return path. Using this method some years back during a return path proof-of-performance led me to within 6 ft of a defective splice. The local plant technician was duly impressed.
Read MoreBy H. Mark Bowers – Coaxial cable is used to transport high frequency electrical signals with relatively low loss and is used in a variety of applications and industries.
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By H. Mark Bowers – It’s now obvious that impedance and power in this circuit must also be complex (vectors) and indeed they are. Using the formula for Z (shown earlier) for a parallel circuit yields 70.7 ohms for this RC circuit but doesn’t provide the phase angle.
Read MoreBy H. Mark Bowers — In August 1992 in conjunction with a CableLabs conference on this subject, the Outage Reduction Task Force issued its initial findings and recommendations from the first four subcommittees. Each area of outage reduction research had a separate subcommittee.
Read MoreBy H. Mark Bowers — During 1991 and 1992, the CableLabs’ Outage Reduction Task Force expended considerable effort and research into finding practical solutions to reducing cable system outages. The final report was issued in August 1992 in conjunction with a CableLabs conference on this subject.
Read MoreBy H. Mark Bowers — Broadband noise generators offer a viable alternative to the tracking generator approach. A fairly flat RF output response noise generator can be purchased for several hundred dollars and can be paired with most spectrum analyzers.
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By H. Mark Bowers — Broadband noise generators offer a viable alternative to the tracking generator approach. A fairly flat RF output response noise generator can be purchased for several hundred dollars and can be paired with most spectrum analyzers.
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By H. Mark Bowers — Revisions to FCC Part 76 Rules were released in April of this year. Significant changes were included in this release, including the rewording of some test procedures and standards, QAM carrier limits for aeronautical frequency notification.
Read MoreBy H. Mark Bowers — Preparation for AC design calculations requires a diagram of all amplifiers (system actives) in a tree-branch configuration as was shown in Part One of this series
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By H. Mark Bowers — Many technicians struggle with AC design, particularly in the area of proper power supply placement and loading. AC design involves concepts and principles that we don’t use in every day system maintenance or operation.
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