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*Ron Hranac
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06/01/2011
Just How Strong Is That Ingress?
From time to time, I correspond with cable system technical staff who are dealing with upstream ingress from a Citizens Band (CB) radio signal in the vicinity of 27 MHz. In some cases, the ingress is quite strong, leading outside plant personnel to believe the CBer must be using an illegal linear amplifier to boost […]
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05/01/2011
Digital Proofs Or Not (Part 2)?
(Editor’s note: Last month, Ron began the “digital proofs” conversation and this month, he finishes.) 5. CTB: Not worse than -53 dBc referenced to inband carrier levels for analog channels. 6. CSO: Not worse than -53 dBc referenced to inband carrier levels for analog channels. Measuring composite triple beat (CTB) and composite second order (CSO) […]
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04/01/2011
Digital Proofs Or Not (Part 1)?
Did you know the Federal Communications Commission (FCC) has required digital signals carried on most cable networks to meet certain technical performance parameters, and that this requirement has been on the books for several years? I thought that might get your attention. But it’s true; §76.640(b)(1)(i) is where you’ll find the rules for digital signals: […]
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03/08/2011
Imagine All the Problems With Interlaced Versus Progressive Video
As if there weren’t already enough technical considerations for distributing video to multiple screens, Imagine Communications has directed attention to yet another thing to consider. It has to do with the difference between interlaced (i) video and progressive (p) video. The terms interlaced and progressive refer to the scanning process used to create an image […]
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03/01/2011
Our Old Friend CNR
When you think of downstream carrier-to-noise ratio (CNR or C/N), what comes to mind? This sounds like an “it depends” question, so let’s establish a couple ground rules before getting too far along in the discussion. First, CNR is a post-modulation or pre-detection measurement made in the RF domain. Second, I’m going to defer to […]
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02/01/2011
‘Did You Know?’ Q&A Wrap-Up: Hranac Tackles The Tough Ones
In December 2010, Senior Technology Editor Ron Hranac hosted a 90-minute Webcast (www.cable360.net/ct/webcasts) focused not only on sharing his institutional knowledge about some of the broadband industry’s technical minutia, but also on answering myriad questions submitted by the audience. There were so many queries, however, that time ran out before they could be addressed. Here […]