Josef “Jeff” Sipek

The jeffpc Amateur Radio Fox

There is already a number of different fox hunting designs out there—both commercial and hobbyist built. Therefore there is no practical reason to make another design, but educational and entertainment reasons are valid as well.

So I made one.

I put together a project page which talks about the project a little bit but mostly serves to point at the source, binary files, schematic, and a manual. Since it doesn’t make sense for me to repeat myself, just go over to the project page and read more about it there ;)

Finally, this is what the finished circuit looks like:

As always, comments, suggestions, and other feedback is welcome.

2022-05-15 — A cornucopia of amateur radio content.

Software type content — Assorted (mostly DSP) software by Jonti.

Dad Jokes — US government’s dad joke API.

Second IC :) — Sam Zeloof’s second home-made IC.

10 tips for academic talks

USB Cheat Sheet — Fabien Sanglard’s very nicely done summary of the USB standard naming mess.


The Confusing World of USB

Amateur Radio License Map

Topographic maps

VHF/UHF Line of Sight Calculator

Hey What’s That — Line of sight calculator

Radio Mobile Online — RF coverage estimator

Telnet Access to DX Clusters and Reverse Beacon Network

FCC M3 Map of Effective Ground Conductivity in the US for AM Broadcast Stations

The Official U.S. Time


OpenMCT — While I’m not a fan of web-based UIs, this is a rather neat “dashboard” framework by NASA.

Wideband spectrum received in JO32KF — Over 5 years of HF spectrum waterfall in Enschede, NL.

10 Most(ly dead) Influential Programming Languages

Wikipedia article: PACELC theorem — An extension of the Wikipedia article: CAP theorem.

Learn Rust the Dangerous Way — Finally a Rust tutorial that speaks to people comfortable in C.

Interferometry and Synthesis in Radio Astronomy — An open access book.

Aviation Formulary — Great circle math applied to various aviation problems for those too lazy to derive the formulas themselves.

Papírová platidla Československa 1918-1993, České republiky a Slovenské republiky 1993-2016 — Complete list of all bank notes used in Czechoslovakia, Czech Republic, and Slovak Republic.

NOAA GOES Image ViewerWikipedia article: GOES weather satellite imagery.


Smart Clock: A New Time — Using three inexpensive wrist watches to achieve 1 second accuracy over an extended period of time.

Repairing the card reader for a 1960s mainframe: cams, relays and a clutch

The 555 Timer IC an Interview with Hans Camenzind—The Designer of the Most Successful Integrated Circuit Ever Developed

High-level Problems with Git and How to Fix Them — A Mercurial developer’s view of Git’s shortcomings.

Mailing lists vs Github

GDL 90 Data Interface Specification — Definition of the serial protocol used by Wikipedia article: UAT receivers to feed the received data to Wikipedia article: MFDs.

GDL 90 Extended SpecificationForeFlight’s extension to GDL 90.


Doug Engelbart Institute — Online exhibits, historic videos, texts, archive photos, and stories about Doug Engelbart, the inventor of the mouse, hypertext, and GUIs…all in the 1960s

Flight recorders data inspection by Airbus

Parsing JSON is a Minefield

Completely Painless Programmer’s Guide to XYZ, RGB, ICC, xyY, and TRCs — Brain-hurting amount of information about color profiles, etc.

darktable — A Lightroom-like open source software

World plugs — Info about every electric plug form factor in the world


The CRAPL: An academic-strength open source license

How the PC Industry Screws Things Up

C to Rust translator

Csmith — a random generator of C programs

ACME Mapper — high-precision general purpose mapping application

The On-line Verb Conjugator


The million dollar engineering problem — Scaling infrastructure in the cloud is easy, so it’s easy to fall into the trap of scaling infrastructure instead of improving efficiency.

Some Notes on the “Who wrote Linux” Kerfuffle

The Ghosts of Internet Time

How a personal project became an exhibition of the most beautifully photographed and detailed bugs you ever saw — Amazing photos of various bugs.

Calculator for Field of View of a Camera and Lens

The Megaprocessor — A microprocessor built from discrete transistors.

Why Pascal is Not My Favorite Programming Language

EAA Video — An assortment of EAA produced videos related to just about anything aircraft related (from homebuilding to aerobatics to history).

The Unreasonable Effectiveness of Recurrent Neural Networks


The resolution of the Bitcoin experiment

Needs washed — A (strange) regional syntactic construct.

The Inside Story of an Aid Worker’s Secret Weapon: The Tarp

3L: The Operating System for the Future — An OS written in Scheme.

Dear Headhunters… — Joerg Moellenkamp’s rant directed at headhunters.

Princeton University Computer Architecture — Computer architecture course from Princeton offered through Coursera.

Glendix — Plan 9 userspace on top of the Linux kernel.

awk-raycaster — Pseudo-3D shooter written completely in awk using raycasting.


Radium-Schokolade (1925) — Radium-laced Chocolate. Sold as something to rejuvenate your organs by eating or drinking it.

Untraceable communication — guaranteed — New untraceable text-messaging system comes with statistical guarantees.

Normalization of Deviance in Software

Michigan Terminal System Archive — It is good to see Wikipedia article: MTS live on as a historical curiosity and hobbyist OS.

Researchers uncover JavaScript-based ransomware-as-service — Ransomware-as-a-service…sigh.

imap4 partial fetch request — Sadly, mutt still doesn’t have it. I really don’t enjoy waiting for a large attachment to get downloaded over a slow link just because I want to read the email body.

Mathematicians invent new way to slice pizza into exotic shapes — I am not sure how some of those new shapes can possibly work in the real life without the notches essentially splitting the slice into a pile of mush that cannot be held.

Powered by blahgd