Author: Bert H

Our mission at ClearSkyRF is to provide a low-threshold experimental environment that unleashes new forms of creativity and scientific insight.

Using what’s at hand and making the most of your surroundings is critical to gaining quick insights without the high price tag associated with formal experimentation.

In this series, I share documentation from my past experiments — hopefully to spark ideas and conversations.

3D printers are great assets for radio amateurs. Here’s an experience and one practical application.

A helical filter for 6m wavelength on a 3D-printed form:

I sometimes even make most of the antenna out of 3D-printed materials. Here’s a Biquad to boost the otherwise below-the-noise-floor AT&T service. It gives 20dB gain over the Netgear Nighthawk internal antennas. The 45-degree tilt and the 90-degree offset between them are to allow for MIMO to function. The screen is a single-use barbecue grate. It was built to last a couple of weeks, but it’s been up for a year.

Our mission at ClearSkyRF is to provide a low-threshold experimental environment that unleashes new forms of creativity and scientific insight.

Using what’s at hand and making the most of your surroundings is critical to gaining quick insights without the high price tag associated with formal experimentation.

In this series, I share documentation from my past experiments — hopefully to spark ideas and conversations.

Here’s a helical filter for 70cm wavelength made from a soup can:

Our mission at ClearSkyRF is to provide a low-threshold experimental environment that unleashes new forms of creativity and scientific insight.

Using what’s at hand and making the most of your surroundings is critical to gaining quick insights without the high price tag associated with formal experimentation.

In this series, I share documentation from my past experiments — hopefully to spark ideas and conversations. Let’s talk ADS-B today.

This is a 1090MHz interdigital filter for ADS-B reception:

Here’s an old receiver I cobbled together with a Raspberry Pi 1 to go onto the roof: