Noise

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 […]

Read More

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 […]

Read More

Ham radio causing USB disconnect

For a while now, whenever I’ve had my PC on, and I’ve been talking on SSB (several bands), I hear occasional Windows USB connect/disconnect sounds. Generally a disconnect sound whenever I start talking, and then a connect sound when I finish. You can poke around in the Windows Event Viewer to try and figure out […]

Read More

Switch-Mode vs Linear Supplies

Amateur radio transceivers demand power supplies which have a large current capacity. The average 100 watt radio transceiver requires over 20 Amps when in transmit mode. Overview A linear power supply uses a large heavy transformer to step down the input high voltage AC to a level close to the desired output. From there, the […]

Read More