Noise & Receiver Performance

In this article, I’m going to cover Noise Figure, Noise Factor, Noise Power, Receiver Bandwidth, and how they can affect overall radio receiver performance. Contrary to popular belief, these metrics have nothing to do with man-made interference. Noise Power Noise Power is the integral of the noise power spectral density over a given bandwidth, usually […]

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Charger Radiated Emissions

I usually have a respectable HF noise floor at home, for which I count myself lucky in today’s sea of cheaply made switching power supplies. However, we were expecting some severe winter weather a couple of weeks ago (it never materialized, but that’s beside the point) and I noticed that my noise floor had gone […]

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Baofeng Cemetary

As of the date of this post, you can get a Baofeng UV-5R for $28, or buy two for $50. Dirt cheap. I bought my first Baofeng UV-5R back in 2012 when they were priced around $62 on Amazon. I thought this was a cracking deal. Upon testing the thing out, I found that the […]

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UR6QW Processor with Dynamic Microphones

While this post is written with the UR6QW processor in mind, it contains information which is widely applicable. There is some concern about connecting dynamic microphones to devices which commonly use electret condenser microphones. I believe this requires some clarification. Electret condenser microphones generally require about 3 to 5 volts DC to supply an internal […]

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What is characteristic impedance?

The RF world is full of esoteric terminology, and not least of these is characteristic impedance, or Z0. Most coaxial cables have a characteristic impedance of 50 or 75 ohms. If you want to know why 50 ohms was arrived at as a sort of standard for radio applications, you can read this post. In […]

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QUCS for Filter Design

Introduction QUCS, or Quite Universal Circuit Simulator, is a freeware utility that allows you to draw circuit schematics, and perform AC & DC simulation, noise simulation (for S-parameters, and AC simulations), S-parameter simulation, and a whole lot more upon them. I first tried QUCS about a ten years ago, and for whatever reason (lack of […]

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Ham Drought

It has been ages since I’ve had a good spin of the dial on my FT-991A, or my IC-7300. I missed the SCARS field day, I didn’t even switch on my radios during field day, and my only appearance on VHF/UHF lately has been on our local tornado siren net on the SCARS 443.700 repeater. […]

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DMR – Digital Mobile Radio

DMR has taken off in our local ham club, and around the world. If you just want someone to talk to, there is always someone out there, somewhere around the world. If this is what you’re in ham radio for, then you’ve got it made. In these days of sunspot cycle low, it’s getting harder […]

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My IC-7300 TX Audio Setup

The IC-7300 has very good transmit audio out of the box, with the stock microphone. With a little tailoring to your voice tone, it can give excellent results. It seems though, I’m never happy with my transmit audio settings. Even though I am told I have a face for radio, maybe I’ve just not got […]

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Radioddity GD-77: A look inside

After many people telling me that my blank screen issue is down to a loose ribbon cable, and since Radioddity are replacing my defective GD-77, I saw no harm in having a look inside. After all, if it’s such an easy fix, why not? I would like to report that I found no disconnected ribbon […]

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