After a recent post on the GQRP Yahoo group I have been asked by several people about the desoldering tweezers I use for removing SMDs. They plug into a Xytronic LF 1000 solder station. I have several different bit sizes as follows:2mm,3mm 5mm,10mm,20mm and 30mm. There are more available but these [...]
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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 [...] 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 [...] 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 [...]
Just made an ESR meter from the G0NQE design,details are here. Maybe it will help to avoid more exploding electrolytics! See page here. Also working on an RF power meter from an article in the June 2001 QST by W7ZOI and W7PUA. More details later. [...] 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 [...] Testing the RX section of the eight band cw-transceiver produced the following MP3 recording.(Just click on the link and it should play.) 20M SCAF demo The clicks and thumps show when the filter was switched in and out –the effect is quite obvious! The recording made was using an Idiom Press SCAF-1 which I [...] A recent /P trip convinced me that I needed a quick deployment multiband vertical antenna. The 20M ‘squid pole’end fed half wave worked well but I wanted to use other bands. Searching the web produced plans from W3FF for a homebrew Buddistick. (Clicking the the link will download a PDF file.) A trip to [...] This year the GQRP club Rishworth QRP Convention Saturday 22nd October and full details can be found on the Club web site. There will also be a buildathon and display of homebrew equipment on the Friday evening not far from the main venue. More details in the QRP article on page 54 of the June [...] | ||
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