Tiny Tornado for 80m
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Many years ago I built a prototype of the famous “Pixie 2”, one of the simplest and smallest CW transceivers ever designed. The main issue is that the TX and RX frequency is the same, so the opposite station needs…
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Tag qrp
First experiences with my 30m QRP transceiver
![[image]](https://www.pa3hcm.nl/wp-content/uploads/2014/08/20140819_093923.jpg)
This year I built a very nice 30m QRP transceiver, based on a design by Onno PA2OHH. Meanwhile I have used this rig a couple of times, and did some measurements too. This article tells some of my experiences with…
Altoids L-tuner
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2014/08/20140823_203444.jpg)
A while ago Tjeerd PA3GNZ donated me some Barkleys mint tins (identical to the famous Altoids tins), which are rather popular by QRP builders to house small homebrew stuff. Two weeks later I found a czech webshop, offering a kit…
30m QRP transceiver – Part 5
Since the VFO, LF and receiver seem to work without any problems, it was getting time to build the final parts: the transmitter board, the transmit/receive-switch and the lowpass filter.
30m QRP transceiver – Part 4
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Since I finished all modules for the receiver part (power, LF, VFO and RX-board), it was getting time to put everything together and place it in a nice case. Onno PA2OHH (designer of this radio) managed to put the complete…
30m QRP transceiver – Part 3
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Now all LF parts and the VFO were finished, it was time to build the RF-part of the receiver.
30m QRP transceiver – Part 2
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2014/03/20140319_202725.jpg)
Building a stable VFO is challenging. Oscillators tend to drift away due to (very small) temperature fluctuation, or due to small capacitive changes in the direct environment (e.g. the frequency changes when you move your hand towards the oscillator). The…
30m QRP transceiver – Part 1
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2014/03/qrm30m-lf-modules.jpg)
This summer I want to go walking in the beautiful highlands of Scotland, together with my wife. The mobile phone coverage in this desolate area is none or poor, but hey… I’m a radio amateur! For a daily “sign of…
Pixie2 QRP transceiver for 80m
![[image]](https://www.pa3hcm.nl/wp-content/uploads/2014/01/pixie2.jpg)
Introduction The smallest QRP transceiver for 80 meters, called “Pixie 2”, is a very nice project to start building your own equipment. Minimum components, maximum fun. The spec’s are poor, but what else might you expect for just a few…
Your first transmitter
![[image]](https://www.pa3hcm.nl/wp-content/uploads/2014/01/my1sttx.jpg)
With just a few components, you can make your own morse code transmitter. The output is only a few miliwatts, but this is enough to receive on any radio in your home. In fact, it is only a simple Clapp…