![]() ![]() That way, the metal of the tuning tool you show in the video will cause less drift. (1) It may be a good idea to solder the variable capacitors so that the adjustment screw is grounded. Posted in Radio Hacks Tagged filter, radio frequency, radio frequency design, RF Design, rf filter Post navigation If you really want to dive into RF design, you could do worse than watch these videos from, too. You’ll even see the effect of using shielding to separate the filter sections. Watching the effect different circuit tweaks have in real time on a spectrum analyzer is very instructive. If you’ve been enjoying posts about filters, you’ll see there is a lot of difference between active audio filters and passive RF filters, although some of the ideas are the same. Need a small capacitor? Twist some wire together (a trick we’ve heard called a “gimmick capacitor”). That’s not the only practical advice offered. That way you can tune to account for circuit variances. Even the values of components will vary from their ideal values and may change over time.īecause of that, uses trimmer capacitors in the resonant part of the circuit. Inductors and capacitance have no parasitic elements in our rosy design world. Wires have zero resistance, capacitance, and inductance. ![]() One of the culprits, of course, is we tend to design and simulate with perfect components. He starts out pointing how now modern tools will make designing and simulating any kind of filter easy, but the trick is to actually build it in real life and get the same performance. We bet when made his latest video about RF filter design (YouTube, embedded below), he had the old saying in mind: in theory, there’s no difference between theory and practice, but in practice, there is. ![]()
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