KF5OBS #55: What is a Gunnplexer? | Police Radar Gun

This video shows a couple of 10 GHz and 24 GHz gunnplexer, briefly explains what they do and shows how they can be used to determine an object’s speed.
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KF5OBS #53: 14 GHz Ku Band Block UpConverter

A quick look at what it takes to make a Block UpConverter (BUC) for the 14 GHz Ku-Band satellite uplink band work. A BUC is used in professional Broadcast TV environments to convert a video signal from a L-Band intermediate frequency to the 14 GHz range to be received by broadcast satellites.
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KF5OBS #12: Microwave Experiments on a Budget

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DIY Passive Probe for the GHz range

Passive probes for the GHz range are costly and it’s usually not too economical to invest into one if you’re just a hobbyist. But regular, cheap probes will not work on signals in the GHz range. So is there a homebrew solution? Yes, there is, check it out! Every passive probe and every piece of […]
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Repairing a MRC DAR Plus Receiver

This is another piece of industry story time. This time it’s about Vislink MRC DAR Plus receivers and transmitters. It shows that even highly integrated devices in the $10K range can be repaired quickly and inexpensively. The MRC DAR Plus series transmitter / receiver are professional devices for studio-transmitter links (STL), transmitter-studio links (TSL), ENG […]
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Fixing a microstrip line in a professional Microwave ODU

A while back, I was asked if I could repair a ODU for a BMS Truck-Coder II. Someone had managed to rip the N connector straight off the casing, including a bit of the microstrip line from the distributed element output filter. See what approach I took to fix the broken stripline. The BMS Truck-Coder […]
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Demystifying RF Circuit Design – The art of Voodoo

Mike from Mikeselectricstuff did a very neat teardown of an Anritsu spectrum analyzer. However, he did call RF circuit design Voodoo and implied it’s some sort of black art. But is it really? Let’s have a look. If you watched the video of Mike [1] from Mikeselectricstuff tearing down an Anritsu spectrum analyzer, you might […]
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