Category Archives: Home made

New Books

Two new books landed in the mailbox. One is for my hobby and one is for my work. Which book is for which do you think? Next week we are starting up this winter season’s radio electronics course in our local … Continue reading

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DIY Active antenna

A year ago in May 2012 SM7UCZ showed me an active antenna he had built after a design from PA0RDT. I was really intrigued to hear how well this small device performed at reception. A few days ago I came to … Continue reading

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My first tube TX is functional

Yet a milestone in my life as a radio amateur has been passed: A few days ago I fine tuned my first ever built tube TX for 80m. Great fun! I already have plans for more tube projects 🙂 The … Continue reading

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Solder melted

By coincidence I found an interesting program on the internet today, DIY Layout Creator, that I wanted to try out. Suitably I had the switching logic for the TX/RX switch that I prototyped solderless yesterday and a piece of veroboard … Continue reading

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Switch circuit ready to build… I hope…

Tonight I took time to sit down and think about how to solve the logic to control the TX/RX diode switch for my KRAS transceiver. My idea was that I wanted to have one logic input and two outputs, where … Continue reading

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RX/TX Switch working (without logic)

This evening I constructed the RX/TX switch ugly style. At first it did not at all work the receiver was almost deaf taking the antenna signal through the switch… what was wrong? It took some trouble shooting before I realized … Continue reading

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In resonance…

During the weekend I wound and mounted a toroid coil and a trimmer capacitor for the series resonance circuit between the low pass filter on the transmitter and the receiver of the KRAS-transceiver. It was immediately noted that the receiver … Continue reading

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Receiver functioning also after AF-stage improvement

I have improved the AF stage of the receiver module in the KRAS-transceiver. I increased the amplification in one of the op-amp stages, and now there is a very good audio level from the little speaker. I connected the receiver … Continue reading

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A pile of…

A pile of components to be assembled. The two pieces of circuit board with holes in are to be panels for the transceiver built in our local radio club (SK7CA) education project. The radio works fine on the bench, and … Continue reading

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