Or perhaps 'How to make a microwave filter for $0'. Yesterday afternoon I wanted a 1.2GHz filter for an experiment, didn't need anything super-performant, and didn't want to spend any money. Before I actually show you what the filter looks like (because it's hilariously ugly), here's it's response (0-2GHz sweep): Okay, the frequency response isn't so bad, but I'm putting -10dBm in so we've got about 10dB of insertion loss which isn't great. 300-600MHz seems to seep through at around -40dBc, which is surprisingly not bad. Here's the setup: So you can see from the tuning scale that the center is sitting around 1.2GHz (check out the header image), but what the heck is that thing on the table? To be honest, I'm actually surprised it works. Here's a picture of it taken apart (Note that the wires were bent more accurately before I took the device apart again and took this photo!): Yep, some pieces of wire bent into shapes, stuck onto some tape with a sheet of aluminum used as a ground plane. This piece of MacGyver was suprisingly effective. If you aren't familiar with microstrip filters, what I've implemented is an extremely crude hairpin bandpass filter, which is usually supposed to look like this: Yep, the gods of RF strike again.
Alright; I've been sitting on the same old website theme for the last couple of years, so I figured it's about time to change...
Been sitting on this for a couple of weeks and slowly migrating all of my old content over. I think I've fixed most things now; so this new site's now live!
I've completely changed tech and moved over to the much sexier (in my opinion) Ghost blogging engine, with a heavily modified version of it's normal themes with some alterations to allow for my static content.
Annoyingly I couldn't import any of the comments from my old site easily. If someone's angry about that, let me know and I can hand-re-add your comment if you think it was especially value-adding the post.
Other than that, if you find any dead links or wierdness; let me know. Cheers!