The DC receiver project is progressing slowly. Yesterday I lashed up another band pass filter,BPF,using 10mm coils from Spectrum Communications. With a bit of fiddling it worked well. The PCB design is almost done and for the first time for me the BPFs will use all SMD components to keep the size and [...]
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For the first time I have been able to monitor the radio effects of a meteor shower. It was an interesting time with many pings from about 0400 onwards. The setup was far from ideal;an Icom 7200 as the RX using a long wire antenna resonated for 6m and Spectrum Lab on the PC. [...] A few months back I bought a VNWA from SDR-Kits. Now this was a big purchase,equal to a new rig or well on the way to one. So what can it do? The answer to that is that I am still finding out and learning how to use it. Today is a cold,wet [...] Over the last few years there have been many debates about contests,the behaviour of contesters and what the ever increasing number of contests is doing to the hobby. Some say it is the only way forward,the TINA principle,there is no alternative (sounds familiar!) Others argue that far from being the saviour of [...] I have always liked using DC,direct conversion receivers. Their sheer simplicity makes them attractive but the drawbacks can be irritating. They often suffer from breakthrough from broadcast,BC,stations and rarely have very good selectivity. I have heard of designs for high quality receivers but have been sceptical of the claims,until now! The [...] I have had a few discussions recently about SCA filters, switched capacitive audio filters,and how effective they are. The best way to demonstrate is by listening to recordings made with a variety of receivers. The first is a Small Wonder Lab Rockmite on 30m. The clicks/clunks are the sound of switching the filter in/out. This [...] I will listen,and listen,and then listen again before calling. I will only call if I can copy the DX station properly. I will not trust the DX cluster and will be sure of the DX station’s call sign before calling. I will not interfere with the DX station nor anyone calling and [...] At last the rig is complete,in its box and working. Not saying it is completely finished,there will always be improvements to make but it is working well on all bands. The Rx seems very good,better than I expected. The TX is good with adequate power on all bands. The PA stage is [...] Some Yahoo groups have been buzzing this week after news filtered out that the latest International Amateur Radio Union, IARU, meeting had recommended that the 40m QRP centre of activity be moved from 7030Khz. There was some confusion as to what was really happening and it turned out a move was discussed but not recommended. [...] This was the first time I had made an effort to enter SKW. It was a good experience and certainly got me on the air. I managed to work 50 stations (one uncompleted QSO) in a week which was twice as many since the start of 2011! Here is a breakdown;the results show 14 [...] | ||
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