Internet Archive Seeks Donations of Materials to Build a Digital Library of Amateur Radio and Communications

In Internet Archive is a non-profit project with the main goal of maintaining a historical archive of the world wide web. Its goal is to preserve human knowledge and culture by creating an Internet library for researchers, historians, and scholars. Readers may be most familiar with their 'wayback machine', that allows users to view websites as they appeared in the past.

As part of this project, the Internet Archive is currently seeking donations of materials including printed medium relating to amateur radio and communications to add to their archives. Their press release and contact details read:

Internet Archive has begun gathering content for the Digital Library of Amateur Radio and Communications (DLARC), which will be a massive online library of materials and collections related to amateur radio and early digital communications. The DLARC is funded by a significant grant from the Amateur Radio Digital Communications (ARDC), a private foundation, to create a digital library that documents, preserves, and provides open access to the history of this community.

The library will be a free online resource that combines archived digitized print materials, born-digital content, websites, oral histories, personal collections, and other related records and publications. The goals of the DLARC are to document the history of amateur radio and to provide freely available educational resources for researchers, students, and the general public. This innovative project includes:

  • A program to digitize print materials, such as newsletters, journals, books, pamphlets, physical ephemera, and other records from both institutions, groups, and individuals.
  • A digital archiving program to archive, curate, and provide access to “born-digital” materials, such as digital photos, websites, videos, and podcasts.
  • A personal archiving campaign to ensure the preservation and future access of both print and digital archives of notable individuals and stakeholders in the amateur radio community.
  • Conducting oral history interviews with key members of the community. 
  • Preservation of all physical and print collections donated to the Internet Archive.

The DLARC project is looking for partners and contributors with troves of ham radio, amateur radio, and early digital communications related books, magazines, documents, catalogs, manuals, videos, software, personal archives, and other historical records collections, no matter how big or small. In addition to physical material to digitize, we are looking for podcasts, newsletters, video channels, and other digital content that can enrich the DLARC collections. Internet Archive will work directly with groups, publishers, clubs, individuals, and others to ensure the archiving and perpetual access of contributed collections, their physical preservation, their digitization, and their online availability and promotion for use in research, education, and historical documentation. All collections in this digital library will be universally accessible to any user and there will be a customized access and discovery portal with special features for research and educational uses.

We are extremely grateful to ARDC for funding this project and are very excited to work with this community to explore a multi-format digital library that documents and ensures access to the history of a specific, noteworthy community. Anyone with material to contribute to the DLARC library, questions about the project, or interest in similar digital library building projects for other professional communities, please contact:

Kay Savetz, K6KJN
Program Manager, Special Collections
[email protected]
Twitter: @KaySavetz 

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TechMinds: A Look at the TRX DUO Red Pitaya Clone

The Red Pitaya is advertised as an open source electronics laboratory instrument, but as it's essentially a software defined radio with built in computing hardware, custom software can be installed allowing it to function as an HPSDR compatible RX/TX capable SDR.

The TRX DUO is a "Red Pitaya compatible" device that comes at a price significantly lower that the Red Pitaya. Its specifications are comparable to the Red Pitaya SDRlab 122-16 which in the official website goes for 625,00€ / US$622. In comparison the TRX DUO can be found on marketplace sites like Aliexpress for almost half price at US$320.

The TRX-DUO has a tuning range from 10 kHz to 60 MHz, 16-bit ADC and 2-RX and 2-TX channels. It also has a built in ARM Cortex A9 processor, and Xilinx Zynq 7010 FPGA SOC. The built in computing means that decoding software can be run directly on the device if desired.

Matt from the TechMinds YouTube channel has recently tested and reviewed the TRX-DUO in his latest video. His video goes over the specifications, software installation, and a demonstration of it receiving HF signals. He goes on to show how it can be used as an 8-band WSPR monitor, and how you can enable WiFi on it and download various Red Pitaya apps.

Matt also notes that the transmit power of the TRX-DUO is very small at 2.5 mW, but of course an external amplifier can be used to boost this.  However, it is important to note that band filtering would be required for the emissions to be safe to transmit.

TRX DUO APPLICATION BASED HF SDR TRANSCEIVER (RED PIYATA)

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HackRF Opera Cake Released: A Rapid RF Switching Board

Back in 2016 Michael Ossmann, founder of Great Scott Gadgets and creator of the HackRF released schematics for 'Opera Cake', a rapid RF switching add on board for the HackRF. We also saw back in a January 2018 post how Opera Cake was capable of being used as the switching hardware for Pseudo-Doppler direction finding. Up until now Opera Cake has only been available as a schematic, for advanced hackers who could produce and build the board themselves.

Earlier this week Opera Cake was released for sale via various resellers in the US, UK and EU. The pricing from the US reseller is US$190.

Opera Cake is an antenna switching add-on board for HackRF One that is configured with command-line software either manually, or for automated port switching based on frequency or time. It has two primary ports, each connected to any of eight secondary ports, and is optimized for use as a pair of 1x4 switches or as a single 1x8 switch. Its recommended frequency range is 1 MHz to 4 GHz.

When HackRF One is used to transmit, Opera Cake can automatically route its output to the appropriate transmit antennas, as well as any external filters, amplifiers, etc. No changes are needed to the existing SDR software, but full control from the host is available.

Opera Cake also enhances the HackRF One’s use as a spectrum analyzer. Antenna switching works with the existing hackrf_sweep feature, which can sweep the whole tuning range in less than a second. Automatic switching mid-sweep enables the use of multiple antennas when sweeping a wide frequency range.

Opera Cake connected to multiple antennas
Opera Cake connected to multiple antennas
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Quick Demo of our KrakenSDR Network Mapping Direction Finding Software (Alpha)

The KrakenSDR is our 5-channel coherent radio based on RTL-SDRs, and it can be used for applications like radio direction finding and passive radar. We successfully crowd funded the device on Crowd Supply back in November 2021.

Over the past year we've been working on a networked mapping system for KrakenSDRs that will allow distributed units to contribute radio direction finding bearing data to a central server. This allows for multiple fixed KrakenSDR sites to combine live bearings, allowing for near instantaneous localization of transmission sources.

We are close to releasing an alpha version of this software for KrakenSDR and KerberosSDR customers to test, and will have news about signups within the next few weeks. For now it will be restricted to three networked units per user.

In the future we plan to add (reasonably priced) advanced features like support for more units, history rewind, multi-channel layering, remote KrakenSDR management, object tracking, ID differentiation, and recording and playback of mp3 sound bites based on tracked location. 

Below is a simple timelapse demo of the system tracking a weather balloon from a single station. Because it's only a single station, the red estimation dot can be ignored. The yellow dot indicates the actual GPS location of the weather balloon. Once the weather improves we'll be setting up a distributed two-station test.

One interesting thing to note is how the KrakenSDR tracks the balloon accurately, until the elevation angle between the antenna and balloon goes above 45 degrees which happens when the balloon rises higher and comes too close to the station. At this angle the antenna array can no longer track the balloon correctly. Once the balloon falls to a lower altitude and the elevation from the antenna is less than 45 degrees accurate tracking resumes.

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A WebUSB Based RTL-SDR Aircraft ADS-B Decoder

Over on GitHub @devdevcharlie has uploaded open source Javascript code for creating an ADS-B Aircraft Radar system entirely within a web browser. The code makes use of the Web USB API, which enables USB devices like RTL-SDR dongles to connect directly to the code running in the web browser.

In her blog post, Charlie explains her code in greater detail, noting that it draws inspiration from AirplaneJS and rtlsdr.js. She explains how the Web USB API works, how to process the raw ADS-B data, and what her final setup looks like.

A demo site that you can use to directly connect to your RTL-SDR is available here.

In the past we've seen other WebUSB projects, like "aprs-sdr" which creates an APRS repeater system using a HackRF.

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A Broad Overview About HF on the RTL-SDR Blog V3

Over on YouTube, Tom the Dilettante has uploaded a video demonstrating how to receive HF signals with an RTL-SDR Blog V3 running in direct sampling mode. This is something already known to most RTL-SDR fans, but on the RTL-SDR V3 we have built in a direct sampling circuit that enables reception below 24 MHz with a simple settings change in software.

In the past and with other dongle brands, enabling direct sampling required hardware mods involving directly soldering a wire antenna to very small pins or pads. Direct sampling is not a high performance mode for HF, but in many situations it can be good enough for casual listening. 

In his video Tom demonstrates HF reception with the RTL-SDR Blog V3 and an MLA-30 active loop antenna. This is a cheap loop antenna available on Aliexpress that works very well for the price.

Listen Around the World - No Internet Required (HF & Shortwave on RTL SDR)

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Radio Jove Spectrograph Hardware and Software

NASA's Radio Jove is a project that enables students and amateur scientists from around the world to observe and analyze the HF radio emissions from Jupiter, our Sun and our galaxy using easy to construct HF radio telescopes that receive spectrographs from 16-24 MHz. The project has existed for more than two decades, and these days the telescope builds mostly make use of low cost software defined radios.

In a presentation for the Society of Amateur Radio Astronomers (SARA) Richard Flagg & Jim Sky talk about what sort of hardware is used these days for the Radio Jove project. They note that SDRs like the Softrock, Funcube Dongle Pro+, SDR-IQ, SDR-14, RTL-SDR, and RASDR have been used. They go on to discuss some of the spectrograph logging software that is used with the project as well.

The presentation slides in PDF form can be found here.

Richard Flagg & Jim Sky: Radio Jove Spectrograph Hardware and Software (RJ10/11)

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SDRSharp Big Guide Book Updated to V5.3

Paolo Romani (IZ1MLL) has recently released version 5.3 of his SDRSharp PDF Guide. The book is available for download on the Airspy downloads page, just scroll down to the title "SDR# Big Book" and choose your language.

As before the document is a detailed guide about how to use SDRSharp (SDR#), which is the software provided by Airspy. While intended for Airspy devices, SDRSharp also supports a number of third party SDRs, including the RTL-SDR, and it is the software we recommend starting with when using an RTL-SDR.

Paolo writes:

Youssef Touil hasn't rested for a moment and the SDR# releases have been moving forward in leaps and bounds with new Denoisers (NINR), CCC, Audio/Baseband records and the new menu features.

I also had to re-update my Big Book PDF to v5.3 as a result!!

I have also implemented the SpyServer section a lot in multi OS and a chapter "Ideas and Suggestions" with two paragraphs: SDR & MacOS and the other using SDR# with two multiple monitors.

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