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RF Measurements in the Cable Plant – Learn more about RF
Episode 20 Hosted by Brady Volpe of the Volpe Firm and Nimble This. Guest John Downey, CMTS Technical Leader at Cisco Systems and special guest, Ron Hranac Technical Leader at Cisco Systems. Today’s show we will cover a number of topics including RF measurements and fundamentals. The discussion starts with basic building blocks of the sine wave and evolves to how QAM (quadrature amplitude modulation) signals are comprised of sine waves with varying amplitude and phase shifts, which means even though we call them digital signals, they are actual analog signals carrying digital data. This is a great show for anyone in the cable industry or interested in learning more about basic RF.
For our many podcast listeners – and I know that is a majority of you – we displayed a lot of cool visuals on our show today – so you may want to consider reviewing today’s show on our website at volpefirm.com or on our youtube channel.
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Thank you Ron for the wonderful and very informative presentation!
By the way, during the presentation a discussion happens at approx. 25mins.
John remarks that blacker pictures mean more power because the visual modulation is negative.
Actually the visual modulation could have been positive ie it could have been white pictures requiring more power.
The reason why the visual modulation is negative, is that because this is an AM signal, it is sensitive to AM noise, such as electrical. Making the modulation negative, means that noise introduced during the transmission process, appear as black spots which are much less perceptible.
Say hi to Ron & John from Andy now living in South Africa!