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OpenPanTilt electronics
It has been a while since I made the OpenPanTilt prototype. It is now available on Thingiverse:655790Â and I am quite surprised about the feedback and attention it has gotten. Billions of people have...
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Building a SoftRock Ensemble RXTX SDR
IntroductionThe last couple of months I have been listening a lot to the soldersmoke podcast. In case you do not know, it is two guys, Bill N2CQR and Pete N6QWÂ babbling about building homebrew radios....
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Softrock RXTX completed
After finishing up the receiver part of my Softrock Ensemble RXTX SDR transceiver with great success, I got really motivated to get the transmitter going. The last weeks I have followed AB4UG's...
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WSJT-X and HDSDR with Softrock RXTX
Introduction - A Raspberry failureMy first (and, as it turns out, rather ambitious) plan was to use a Raspberry Pi 2 as SDR computer for my SoftRock, with Quisk, Fldigi and WSJT-X. The plan was to use...
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Upload log files to QRZ.com automatically using LogPusher
IntroductionMany radio amateurs upload their QSO logs to QRZ.com. Not all logging programs can interface with the QRZ API, and unless you are a subscriber, the API does not work. The log can be...
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Lowpass filter for 30m
I just finished a 30m lowpass filter for the Softrock Ensemble RXTX tranceiver.I used the schematic provided by WB5RVZL200 and L201 is wound to about 0.9uH, whereas C200 and C202 is 100pF and C201 is...
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Homebrew dummy load
I have created a simple 50 Ω dummy load to test transmitters. I also added a simple RF diode detector so I can measure the peak voltage, and calculate the power.  The dummy load consists of eight 100 Ω...
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Directional coupler
IntroductionI have been struggling to understand how my simple dipole antenna works (or doesn't work). The diycrap way to understand stuff is usually to read, build and measure, and then read some...
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Nixie tube experimentation with IN-12
IntroductionI have always wanted to try out Nixie tubes in one of my projects, and here we go. Nixie tubes come in many different sizes and there are both top view and side view nixie tubes out there....
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Homebrew SWR and power meter
First of all, this SWR meter in this article is not exactly homebrew, as I based the circuit on the schematic in the excellent book Arduino Projects of Amateur Radio. Although I bought the book and...
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Building Farhans Minima Tranceiver Part #1
IntroductionI have started my most ambitious electronics project so far. After building my Softrock RXTX I was eager to learn more about RF designs, and HF radios in particular. I came across Farhan,...
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Minima #2 - Crystal filter construction
Making the crystal filter for the Minima Transceiver has been a challenging but very interesting experience. Challenging because I do not have any fancy test equipment. But I learned a lot, and it was...
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Synthicase and Softrock timelapse build video
I finally got around to throw my synths in a suitcase. It is a injection moulded case (Pelicase copy). The case consists of a x0xb0x bass synth, a Sonic Potions LXR drum machine, a Shruthi-1 synth, a...
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Loaded dipole for 20m
My HF-project has stalled since I do not have a decent antenna. I have limited space for a full-sized antenna on my roof. My friend LA8OKA has assembled a loaded 20m dipole, and I wanted to test a...
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EMRFD Direct conversion 40m receiver in a tea caddy
I woke up one day eager to build something simple (at least I thought is was simple) and opened up the first chapter in EMRFD and decided to build the 40m direct conversion receiver. I already had most...
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WA2EBY IRF510 amplifier
The WA2EBY amplifier is a famous linear amplifier project published in QST in March and April 1999 by Mike Kossor WA2EBY. As this amplifier can give up to 50W out with 1W drive, it is a perfect pair...
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Magic Eye Tube 6e5c
Magic Eye Tubes were used as RF-indicator tubes on radios from the 1930s until the end of the tube era and needle movement meters displaced them.I love the glow of these tubes and want to use one as a...
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Dekatron tubes controlled by arduino
Interfacing dekatron tubes with a microcontroller is fairly easy, once you understand how the tubes work. Threeneuron's Pile o'Poo of Obsolete Crap provides the necessary background information and...
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Homebrew return loss bridge
I have had some problems making return loss measurements using my homebrew directional coupler, and decided to build the return loss bridge from EMRFD and the ARRL handbook.This is the final device....
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Homebrew 40dB step attenuator
A home lab needs a step attenuator. Â It helps in evaluating RF amplifiers, filters and receivers. Both the legendary EMRFD-book, the ARRL handbook, and a variety of QST-articles provides circuit...
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Hiding an ugly Wi-Fi router with some old books
Disclaimer. This post is not directly related to electronics DIY, but it is somewhat radio related. It is also DIY and a hint of crap.I have an ugly Wi-Fi router on a shelf that I would like to hide....
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Small steps
Sometimes a project stalls for a while. A long while. You know you will get back to it. You just have to compete all the other tasks in life first. But you know that you will not quit. You will finish...
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Bluetoothifying a Tivoli PAL FM Radio
Norway became the first country to shut down national broadcast radio on FM. We have now switched to Digital Audio Broadcasting (DAB) leaving a lot of FM-radios useless.I have a few Tivoli PAL radios...
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Kjernebiter (Pine Grosbeak)
I went out in the snowy gray weather today, and luckily i found the flock of Pine Grosbeaks (Kjernebiter) which has invaded Oslo this autumn. Photos taken with my 10 year old Nikon D90 and the even...
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