My thoughts on Amateur Radio & Software Development
Tobias Wellnitz, DH1TW
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2024
February
Protector for SKF ball-bearings on antenna masts
January
VNA Prototyping Board
2021
May
Troubleshooting Icom RS-BA1 network issues
2020
January
Outstanding VHF Tropo propagation
ST-Link & Blue Pill Development board
ICOM IC7300 and IC9700 variable TX Delay verified
2019
December
Real-life CI/CD pipelines with Github Actions
Cross-Compiling Golang (CGO) Projects
July
Diamond MX-2000N HF/VHF/UHF triplexor teardown
Replacing Yaesu FT857 IF filters
2017
January
My new 40" 4K Desktop monitor (TV)
Beverage antenna & radials cart
2015
January
Network accessible Rotators
DG8SAQ VNWA & Virtual Machines
2014
January
DXHeat.com is online
2013
May
Will additional coax stubs improve Bandpass Filter performance?
March
How to rapidly deploy & remove antenna radials
Can I still use oxidized coax cable?
4O3A Triplexor
Double Half Delta Loop (DHDL) Low Band Receiving Antenna
February
Microcontroller based Stackmatch Controller
New Stackmatches for ED1R
2012
September
Evolution of the DG8SAQ VNWA
A simple broadband 4:1 Balun Transformer
July
How to measure Ground Conductivity
June
Community Improvement on Tuning wheels
My A73A presentation at the Contest Forum
May
Coax Stubs for 20m and 40m
Quick & Easy: VPN through SSH Tunnel
How to set up an Ubuntu Server on Amazon EC2
March
Testing-Device for GU74b / 4CX800 tubes
Customs broke my tubes (4CX800 / GU74b)
February
Flex Control – Interviewing the Developer
January
W7IUV Beverage Pre-Amp (2N5109)
2el Vertical Array for 160m
HC2/AL1O qrv from Ecuador
2011
December
How to exchange the GU74b / 4CX800 tubes on your Alpha91b (Alpha99) Amplifier
Building a beverage switching box
November
A73A in CQWW SSB 2011
May
How PowerSDR-UI users set up their DJ Consoles
April
FiFi SDR – The Interview
March
PowerSDR-UI – knobs for your SDR radio
January
VP8ORK Dinner in Buenos Aires
2010
December
Disc Jockeys influence on SDR
June
Presentation: How new technologies affect the art of contesting
SDR appliance: JN1SDD’s NCDXF / IARU Beacon Monitor
May
CW Skimmer, Win-Test & FT1000MP: my wish!
March
PMSDR – an interview with IW3AUT
February
Do you truly understand the SDR concept?
2009
December
FA-SDR-TRX part #3 – the Transmitter
FA-SDR-TRX part #2 – The Receiver
FA-SDR-TRX part #1 – Systems View
2008
November
Debugging the RS232 serial port
September
Measuring ICE Bandpass Filter
August
Assembly & Measurement of a 3dB Splitter
July
Bandscope Modification Yaesu FT1000MP
Tobias Wellnitz, DH1TW
Software Engineer
Germany