![[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…
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.
![[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…
![[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.
![[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…
![[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…
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