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Tom Salzer's avatar

Steve, it is always a pleasure to crack open Zero Retries. I look forward to it every week, knowing you are going to have great content that stretches my thinking. I appreciate your work very much. The icing on this cake was to discover your very gracious recommendation of the Random Wire newsletter. Thank you! Looking forward to that cup of coffee! ...Tom KJ7T

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ReadyKilowatt's avatar

Don't write off coax for Internet service delivery! Comcast actually has a fiber competitive product with their Remote PHY device (RPD) node and passive coax. Remote PHY is pretty much a wide band SDR based on massive FPGAs and wide bandwidth DACs. The RPD takes a 10Gbps signal from the hub site and converts it into a 1.2 GHz wide complex RF waveform that creates OFDM, QAM and legacy signals for customer devices. It's pretty cool stuff. Not only that but borrowing CDMA tech from the cellular industry can offer symmetrical bandwidth up to and beyond 1 Gbps to the home over coax. This will likely be the last "upgrade" for the coaxial network but it can be done with a significant cost savings over having to run fiber to every potential customer.

That said, Comcast is taking an extremely long time rolling out the updates. At the rate they're going it will take decades. They're prioritizing areas with high population density or areas with lots of competition to make the numbers look good, which doesn't bode well for those of us who don't have other choices. And because Comcast wants to maintain uniform marketing across the company the expanded features and potential won't be realized until some threshold of homes passed is reached. Shame that. The Innovator's Dilemma seems to be a recurring theme in technology...

Speaking of innovation, I picked up a Kenwood TH-D75 a few weeks back. I sold a few older HTs that made the price basically a wash and combined a few radios into one. Pairing it with my phone changes APRS, finally there's a proper keyboard and display for sending short messages. But I still see the same weather stations, iGates and mobile beacons. Not much else going on. I also dusted off a TM-D700 that was down in the catacombs and got it connected to my home network using a serial-to-Ethernet adapter. Using a macOS program called QTH I get the same chat capabilities and excellent maps too. This has inspired me to start pushing some of my fellow hams in the area to start using APRS with their phones and add them to the home network too. Seems like we could have a really nice general purpose announcement and chat system in the local area (actually the digipeaters cover several hundred square miles across western Colorado and Utah, so not that "local") with very little hardware investment. Heck, I might try my hand at building a Raspbian image with DIrewolf configured to use a CM108 and Baofeng radio for a Zero W to hand out and make it even simpler. Not everyone likes yakking on the repeater all afternoon, but would like to know that 15 meters is open or that someone's going to lunch. I know most of the communications at workplaces are now on chat apps, no reason why that can't happen on APRS with better user software.

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