Posts

RX888 Mk II new generation SDR

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  A description of the RX888 Mk II in the I/O group for the devices (join if interested) https://groups.io/g/NextGenSDRs/message/431 How to set up and use an RX888 MkI or II https://drive.google.com/file/d/1KvtYzBKuLva9Ha0x0S67w59G_Nu8qDeC/view Location of latest libraries to use with HDSDR or earlier versions of SDR#. https://github.com/ik1xpv/ExtIO_sddc SDR Console needs release 27 or higher for the MK II. Not available at 2/3/2021.

Low-cost duplexer for 6m, 2m or 70cm

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 Low-cost duplexer for 6m, 2m or 70cm I am proposing a conceptual design for a low-cost, home-made duplexer for 6m, 2m, or 70 cm. I have not built one to this design but it combines ideas from duplexers I have made or from commercial duplexers. It is worth reading this post in conjunction with my other posts on cavity filters and duplexers; just search the terms. I have written a guide to how duplexers work and have a list of resources on the building and testing of them. https://vk4zxi.blogspot.com/2018/05/the-black-art-of-duplexers-demystifying.html General arrangement The basic design of a single cavity filter is a large diameter aluminium pipe for the cavity and a 1/3 diameter aluminium pipe welded to a top plate. The coupling is mounted on the same plate. The other end of the large pipe is held to another plate by bolts for access. A capacitive hat on a threaded rod is mounted on the bottom plate to tune the cavity. The main pipe is as large as possible to increase the Q of the fi

Apple Silicon: The M1 ARM SOC

 https://erik-engheim.medium.com/ https://erik-engheim.medium.com/impact-of-a-32-core-apple-silicon-cpu-847b0e5e856c https://erik-engheim.medium.com/interesting-random-facts-about-arm-x86-risc-v-and-mips-7e670b249222 https://medium.com/swlh/what-does-risc-and-cisc-mean-in-2020-7b4d42c9a9de https://erik-engheim.medium.com/why-is-apples-m1-chip-so-fast-3262b158cba2 An excellent article on the new Apple M1 chips. It explains how the M1 chip is such a radical change to current PC hardware. However, the one thing he doesn't say is that it may not be that hard to run Windows on the Apple M1 machines. Microsoft already has a version that runs on similar chips designed by ARM, as used in the Apple M1. With Windows on the superior Apple M1 machines, the nexus is broken and much of the Intel intellectual property is redundant. Apple could take a huge share of the PC market. Apple is not adverse to Windows. Windows programs will run on the new M1 machines, just not as quick as if the Windows

Bypass newspaper paywalls

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 Bypass newspaper paywalls with Chrome on Windows and Mac Oh, joy and rapture, finally a way to beat newspaper paywalls. It works with Chrome on Windows and with Chrome on Mac. Follow the link and follow instructions. Pretty easy. https://github.com/iamadamdev/bypass-paywalls-chrome/blob/master/README.md For papers that are not included, such as the Gold Coast Bulletin for me, add its address to the "custom sites" in "Extension options".  But just www.goldcoastbulletin.com.au, not https://www.goldcoastbulletin.com.au/ Works fine. Tried on both Windows and Mac.

One remote streaming international TV with a VPN; Roku and a secondary router.

One remote streaming international TV with a VPN; Roku and a secondary router. What works (What doesn't work later!) Roku media box with a secondary VPN router. Roku has apps for the streaming services I want, others don't. Specific streaming services are Britbox (USA not UK), Motortrend (USA) and Lucus Oil TV (USA). All out of the USA allows just one VPN router. Sometimes need a USA address and credit card. MyUSA, the freight forwarder gives an address in Florida. American Express, even if issued outside the USA seems to work out ok as a USA credit card. Roku registration needs a USA address and a USA credit card. Motortrend and Lucus Oil TV will work with a non-USA card if they are available in that country, in my case Australia. Roku boxes are hard to get outside of the USA. I bought mine on eBay but Amazon won't ship them and there aren't many sellers on eBay.  https://www.ebay.com.au/itm/223270910515 A general guide to setup a secondary VPN router. https://www.vpnu

Radio Applications of Deep Learning Noise Suppression and Speech Enhancement Part 1: Current Deep Learning Apps

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NVIDA My initial contact with DNN noise reduction was the NVIDA RTX Voice beta. It is meant to work with the new NVIDA RTX graphics cards but works with some earlier ones, specifically the GTX 1060 in my machine. The installer needs to be hacked for non-RTX cards but needs the latest NVIDA drivers. The RTX Voice beta seems a very early release with very little documentation, other than how to install and use it. It seems to be part of the RTX Broadcast Engine but not documented. https://www.nvidia.com/en-us/geforce/guides/nvidia-rtx-voice-setup-guide/ https://forums.guru3d.com/threads/nvidia-rtx-voice-works-without-rtx-gpu-heres-how.431781/ https://devblogs.nvidia.com/nvidia-real-time-noise-suppression-deep-learning/ RTX Broadcast Engine: GPU-accelerated SDKs that deliver AI-powered content creation features https://developer.nvidia.com/rtx-broadcast-engine Krisp-2Hz Started as 2Hz then became Krisp. Much that was promised by 2Hz doesn't seem to be available th

Hacking high power switching server power supplies for amateur radio use.

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Draft Introduction ? Server power supplies are high-quality, heavy-duty, 24/7 supplies but cheap, less than AU$50. They have been modified for amateur use, particularly to turn them on and to raise the output from 12.2 V to around 13.8 V. Mobile phone equipment also has such supplies, but at higher voltages, 24, 36, 48, 60 V. These are good for powering transmitters. As a technique for finding information, Google the power supply model number(s), then look at images or videos for possible sites of interest. Searching images is very powerful and gets past sales sites. Apparently, many server supplies have additional airflow to keep then cool under load, so additional cooling may be prudent. A bit of background to the supplies is considered before what I could find for specific models. Some of the links consider RF noise from these switching supplies, something that needs to be considered. Generally, they are high-quality designs with little RF noise, especially compared to laptop