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The Morse Challenge!
Geocaching is a popular hobby here in The Netherlands. Since my wife and I search for these caches from time to time, the idea came to me to build a cache myself, one that challenges geocachers to listen and decode…
Tag cw
Walt’s Keyer
Almost every nerd is a fan of automation. So whenever we find a repetitive job, we think of a solution to automate it. Since I’m both into automation and amateur radio, I was thinking on automating one of my straight…
Getting started with Arduino: morse keyer
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2014/12/20141230_115736.jpg)
Using a paddle to operate in morse code is very convenient. But paddles don’t create dots and dashes on their own, so you need some electronics, called a “keyer”. You may use the build-in keyer of your radio, but most…
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…
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
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2014/07/20140702_221239-e1404397247303.jpg)
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…
Best dutch participant in AGCW contest
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2014/04/20140201_133834.jpg)
The AGCW is a german club of morse code enthousiasts, maybe the best CW club in the world, with lots of foreign members as well. They organize all kinds of small activities, related to CW off course, one of them…
30m QRP transceiver – Part 3
![[Image]](https://www.pa3hcm.nl/wp-content/uploads/2014/04/20140402_230047.jpg)
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…