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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. 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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