This small jig helps keeping your bench tidy while your test probes are still within arms reach. One of the things I have come to appreciate more over time is a well organised workbench. The tools on a fixed location and within easy reach. I once read a quote from someone who claimed that […]
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Can also be used as RF-millivoltmeter Published in SPRAT#200 In many of our short wave radios the simple diode envelope detector is used for amplitude demodulation. It is build from a single diode and some passive parts. It is a very low cost and simple circuit block. Because of this favourable characteristics it can […] 
Use REAL audio to simulate your filters in LTSpice. Two examples are given. A two stage elliptical SSB filter is evaluated. And a two-stage multiple feedback CW filter is tested. Both are ready to include in your receiver. […] The G2NJ Trophy is sometimes awarded for a really good technical article, and sometimes for an outstanding contribution to international QRP. This year’s winner described a Cross-coupled Double Balanced Product Detector in SPRAT 191. The winner is Cor, PA3COR”Steve G0FUW, Sprat 194 Needless to say it was a complete surprise! I feel very […] 
Updated : January 25th; Input amplifierUpdated : January 26th; Audio filter A couple of days ago I found the circuit of 20m DC PSK31 receiver at the website of va3iul. The website of va3iul is probably well known in the radio amateur community. It features 100’s of circuit design ideas on all kind […] |
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