By Ron Hranac – Skin effect in metallic conductors is an important part of the coaxial cable portions of our networks. Skin effect ensures our radio frequency (RF) signals stay inside of the cables and other components — assuming the shielding is intact, of course. Skin effect is also a major factor in coaxial cable attenuation and is a key reason why attenuation increases as the frequency increases.
Read MoreBy Ron Hranac — The earliest cable networks were one-way — that is, signals could be transmitted only from the cable operator’s headend to the subscriber. Those one-way networks worked well for delivering primarily video services. When two-way technology was developed to support interactive services.
Read MoreBy Ron Hranac — Unless you’re involved with the use of specialized test equipment such as VNAs, S-parameters are likely something you’ve never heard of. At least, perhaps, until recently. In the world of full duplex (FDX) DOCSIS, the S-parameter “S11” is commonly used when discussing an FDX node’s echo cancellation operation.
Read MoreBy Ron Hranac — A surprising amount of behind-the-scenes interaction occurs between Data-Over-Cable Interface Service Specifications (DOCSIS®) cable modems and the cable modem termination system (CMTS). One important process is called station maintenance.
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By Ron Hranac — Two RF power-related parameters that can cause confusion are total power (also called total composite power) and power spectral density (PSD). Grab a cup of coffee and a scientific calculator.
Read MoreBy Ron Hranac — Let’s first look at the concept of equalization from the perspective of a cable distribution network. As you know, in a given length of coaxial cable higher frequencies are attenuated more than lower frequencies.
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By Ron Hranac — Cable operators for decades have dealt with the monitoring and measurement of signal leakage field strength. But just what is field strength?
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By Ron Hranac — In this second installment of a three-part article, the discussion about measurement of downstream RF signal levels continues.
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By Ron Hranac — Earlier this year SCTE·ISBE’s Rocky Mountain Chapter instituted a new program called Last Thursday, a monthly meet-up on the last Thursday of every month. The meetings are open to all chapter members, guests, and those interested in SCTE·ISBE, and provide a fun and social way to participate with the chapter.
Read MoreBy Ron Hranac — Making accurate signal level measurements is not quite as simple as it might seem at first glance. This installment concludes the discussion about various factors that can affect those measurements, and includes tips to ensure more accurate and reliable results.
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