Radio Hobbyist’s Designbook or RHdb (for short) was designed to guide you into design of
electronics apparatus that relates to radio. It assumes you know something about electronics
but you can skip Chapters which cover familiar subjects. Mathematics needed in design is down
to simple algebra and trigonometry. Topics cover the frequency spectrum of DC through VHF.

You must supply the brainpower. But RHdb can be your main reference, a guidance toreaching
your personal hobby goal. RHdb is written in a sort of Reader’s Digest format: Short and
to-the-point, covering things simply with a minimum of words. Grouping is in 5 sections as
givenbelow with a synopsis of Chapters

How to self host various services

Simple & Free Wiki Software

BookStack is a simple, self-hosted, easy-to-use platform for organizing and storing information.

A self-hosted recipe manager and meal planner with a RestAPI backend and a reactive frontend application built in Vue for a pleasant user experience for the whole family.

Open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts.

Baïkal is a lightweight CalDAV+CardDAV server. It offers an extensive web interface with easy management of users, address books and calendars. It is fast and simple to install and only needs a basic php capable server. The data can be stored in a MySQL or a SQLite database.

Baïkal allows to seamlessly access your contacts and calendars from every device. It is compatible with iOS, Mac OS X, DAVx5 on Android, Mozilla Thunderbird and every other CalDAV and CardDAV capable application. Protect your privacy by hosting calendars and contacts yourself - with Baïkal.

FreshRSS is a self-hosted RSS and Atom feed aggregator.
It is lightweight, easy to work with, powerful, and customizable.

A community-supported supercharged version of paperless: scan, index and archive all your physical documents.

Paperless-ngx is a document management system that transforms your physical documents into a searchable online archive so you can keep, well, less paper.

Paperless-ngx forked from paperless-ng to continue the great work and distribute responsibility of supporting and advancing the project among a team of people

A painless self-hosted Git service.

Privacy-respecting, hackable metasearch engine / pronunciation sɜːks.

A state of the art disk pooling application with file duplication.

Combines multiple physical hard drives into one large virtual drive.
Stores everything in standard NTFS (or ReFS) files.

Lets you designate any folder as a duplicated folder.
In case one drive fails, your duplicated files remain safe.

Easily select which disks will be used to store files in any folder.
Speed up your pool by placing performance sensitive files on SSDs.

Seamlessly encrypt and store some or all of your pooled files in the cloud.

Mistborn is your own virtual private cloud platform and WebUI that manages self hosted services, and secures them with firewall, Wireguard VPN w/ PiHole-DNSCrypt, and IP filtering. Optional SIEM+IDS. Supports 2FA, Nextcloud, Jitsi, Home Assistant,

There are around 300 operations in CyberChef allowing you to carry out simple and complex tasks easily. Here are some examples:

Decode a Base64-encoded string
Convert a date and time to a different time zone
Parse a Teredo IPv6 address
Convert data from a hexdump, then decompress
Decrypt and disassemble shellcode
Display multiple timestamps as full dates
Carry out different operations on data of different types
Use parts of the input as arguments to operations

An unscripted, spur of the moment talk touching a little on how Sporadic E works and how you can use 6m WSPR to find high MUF Sporadic E paths.

From Ars Technica

Today, tech archivist Jason Scott announced a new website called Discmaster that lets anyone search through 91.7 million vintage computer files pulled from CD-ROM releases and floppy disks. The files include images, text documents, music, games, shareware, videos, and much more. The files on Discmaster come from the Internet Archive, uploaded by thousands of people over the years. The new site pulls them together behind a search engine with the ability to perform detailed searches by file type, format, source, file size, file date, and many other options.

Discmaster is the work of a group of anonymous history-loving programmers who approached Scott to host it for them. Scott says that Discmaster is "99.999 percent" the work of that anonymous group, right down to the vintage gray theme that is compatible with web browsers for older machines. Scott says he slapped a name on it and volunteered to host it on his site. And while Scott is an employee of the Internet Archive, he says that Discmaster is "100 percent unaffiliated" with that organization.

One of the highlights of Discmaster is that it has already done a lot of file format conversion on the back end, making the vintage files more accessible. For example, you can search for vintage music files -- such as MIDI or even digitized Amiga sounds -- and listen to them directly in your browser without any extra tools necessary. The same thing goes for early-90s low-resolution video files, images in obscure formats, and various types of documents. "It's got all the conversion to enable you to preview things immediately," says Scott. "So there's no additional external installation. That, to me, is the fundamental power of what we're dealing with here."
"The value proposition is the value proposition of any freely accessible research database," Scott told Ars Technica. "People are enabled to do deep dives into more history, reference their findings, and encourage others to look in the same place."

"[Discmaster] is probably, to me, one of the most important computer history research project opportunities that we've had in 10 years," says Scott. "It's not done. They've analyzed 7,000 and some-odd CD-ROMs. And they're about to do another 8,000."