rz01.org

Update 2024-02-05: Added new section “Troubleshooting” This post is intended to help you get started with migrating the QuanSheng UV-K5 handheld radio to a custom firmware under Linux and then programming it using CHIRP.

After migrating from Windows to Linux and with this from SDR Console to the AMSAT-DL QO-100 Linux Transceiver, I had the issue that my transmitted audio was a bit weak in the treble.

After recently migrating my Shack PC from Linux to Debian Linux, I can no longer use the great software “SDR Console”.

The latest news about Microsoft’s plans to use artificial intelligence on Windows machines to scan images and text for malicious content and upload them to Microsoft in case of suspicion, as well as to upload unsolicited user data to OneDrive for security…

The following older project already solved my problem with my constantly freezing Hardrock-50 amplifier by interfacing it with the Hermes Lite 2 with the help of an Arduino Nano as an I2C to serial translator: Hermes Lite 2 Interface Box (HR50 and Antenna…

For some modern electricity meters there is the possibility to read the current electricity consumption and the meter reading via an optical sensor.

After having built an AllStarLink node for stationary operation in the past, I decided to build a second node for mobile operation.

Hier klicken, um zur deutschen Version zu gelangen TL;DR Right at the beginning of this post, I would like to give the impatient reader a highly condensed summary why one wants to become a radio amateur: With an amateur radio license one can build radios…

Click here for English Version TL;DR Gleich zu Beginn dieser Liebeserklärung folgt nun für die ungeduldigen Leser eine stark komprimierte Zusammenfassung, warum man Funkamateur werden will: Mit einer Amateurfunklizenz kann man selbst Funkgeräte bauen, den…

The battery chargers of many chinese HT’s are known to be unreliable, noisy and to overcharge the battery.

This WT32/ESP32 based project, combined with a directional coupler setup, allows you to remotely monitor the output power and SWR of your station via a web browser.

This post describes how I update my Pluto+ SDR transceiver: Download the latest firmware from https://github.com/DeonMarais64/PlutoPlusSDR-FW/releases.

Update: I’ve published a post on a simpler, more integrated version here.

In the last time I hardly sat in front of a real radio but was mainly QRV via SDR radios (Hermes Lite 2 and Pluto Plus).

After I am now finally QRV on the geostationary satellite QO-100, I would like to be able to additionally work LEO satellites, which have amateur radio transponders on board.

The Setup Lenovo Thinkpad T420 Intel Core i5-2520M CPU 16 GB RAM Intel 82579 Ethernet Interface Windows 10 Pro SDR Console v3.3 Beta Build 2870 The Problem I had lots of audio stuttering/drop-outs while using [SDR Console] on my Thinkpad T420 (see above),…

While SDR Console is doing a great job stabilizing the frequency with the help of locking to the middle beacon of the QO-100 narrow band transponder, it still has some inaccurancy.

Frustrated by local QRM on HF, I finally decided to build a ground station for the geostationairy satellite Es’hail 2 aka Qatar-OSCAR 100 - or short - QO-100.

While looking for a 70cm/2m antenna suitable for travelling, I came across the “Praesidenten Antenne” on the net: http://oe1iah.at/Hardware/Antennen/SlimJim2-70.shtml.

Yesterday I had a very successful activation of POTA park “DA-0013 Stromberg-Heuchelberg Nature Park”.

Do you ever wanted to log QSOs offline with an Android/iOS/Desktop app and then upload them to the QRZ logbook?

I’ve designed a simple snap-on wall mount for CX600 coxial relays: You can download the design on Printables.

This page will guide you through the steps required to install Cloudlog onto an OpenBSD web server that is using the OHMP stack (that’s OpenBSD, httpd, MariaDB and PHP).

Preconditions The HF part of my amateur radio station mostly consists of the following: Transceivers: ICOM IC-7300 and a Zachtek WSPR Desktop Transmitter Antennas: Cobweb antenna for 6 to 20m, Hustler 4-BTV for 40m Antenna switches: One coax relay in the…

I’ve made two simple 3D printable protection covers for the MX-P50M ham radio amplifier to protect the switch and other external parts from being damaged or from damaging other gear when being carried in a backpack.

In search of a compact, lightweight and affordable battery that has enough capacity for hours of portable ham radio operations, I came across the infamous Miady 12,8V 7,2Ah LiFePO4 battery which comes with an integrated battery management system (BMS) and…

I’ve recently built two battery packs, one with eight 26650 cells (14.V, 6200mAh, originally 3300mAh/cell) and one with 24 26650 cells (14.4V, 12500mAh, originally 2400mAh/cell).

Since my old and proven antenna is only resonant on 20m and I did not like the fact that the mast does not fit into any backpack, I decided to give the PAC-12 antenna system a go.

I’ve recently purchased the famous chinese MX-P50M 45W amplifier as an addition to the X5105 for portable use.

I wanted to use my BX-184 microphone which has a built-in voice keyer with my new Xiegu X5105.

Today I successfully activated POTA park DA-0020 Neckartal-Odenwald Nature Park.

Yesterday I was able to succesfully activate POTA park “Taunus Nature Park” on the Feldberg near Frankfurt.

The following is a picture of everything I am taking with me to portable operations: The gear consists of the following: Yaesu FT-817 with the following modifications 3D printed Power Pole connector 3D printed VFO knob 3D printed side rails 3D printed pro…

I wrote a Vim syntax plugin for writing Fast Log Entry compatible log files in Vim.

I’ve used one single mail address for over a decade until it was involved in some breaches and thereupon has been sold to spammers.

I have inherited the following collection of battery packs, which were already at least 5 years old at this time: Two battery packs should now be built from them: One as power supply for my Yaesu FT-817 during portable operation and another bigger one from

I just released DXPager, a script that sends DAPNET messages to your pager if a DX station whose entity you have not worked/confirmed before has been spotted.

Last weekend I was able to succesfully activate Waldheide Recreation Park DA-0221 as part of the Parks on the Air (POTA) program.

I have compiled a list of QRP transceivers that are suitable for portable use.

I just released a first version of ColorSpot, a command line DX cluster client written in Python.

In this post I will briefly describe my build of an AllStarLink node.

In this post I will explain in detail how to become QRV on M17 with the following setup: TYT MD380 Raspberry Pi / Pi-Star / MMDVM Hotspot The process will be the following: Modification of the MD380: In order to transmit M17 audio, the radio needs to be m…

In this article I document how I backup my servers locally as well as remotely to borgbase.com.

UPDATE: I moved the client and the server into one project.

The Hardrock-50 is a very nice 50W short wave amplifier that comes as a kit.

I’m in the progress of developing a Python command line application to log QSOs directly into the QRZ.com logbook.

uBitx v6 modifications, Part III: 3D printed knobs (I like VFO knobs with a finger recess) and chassis tilt bails.

uBitx v6 modifications, Part II: Since the AGC board has a S-Meter tap, the next mod was obvious :) The S-Meter of a dead Yaesu FT-290R was a perfect fit for the uBitx case and I think it looks nice.

uBitx v6 modifications, Part I: The uBitx is a very nice radio but the missing AGC is an ear killer.

A $0 Xiegu G1M stand: