Category: Telecommunications

Introduction In the previous post I examined receiving Amateur Radio/University CubeSats on the 433MHz/70cm band (Ref.1). In this post I look at how to decode CubeSat transmissions using the gr_satellites out of tree module on GNURadio. gr_satellites was developed by Daniel Estevez EA4GPZ. I will test several library signal captures to demonstrate how to use… Continue reading RTL-SDR for 433MHz/70cm CubeSats on GNURadio

Introduction Recently I read a book about new rocket and satellite advancements by Ashlee Vance: “When the Heavens Went on Sale” (Ref.1). This got me very excited and I decided to see if I could receive current Amateur Radio or University Cube Satellites. Equipment Setup Figure 1 shows the equipment setup. I decided to copy… Continue reading RTL-SDR for 433MHz/70cm CubeSats

Introduction In the previous two posts I tested a 433MHz LNA for its frequency response or S21. I first used a PlutoSDR signal generator and then a NanoVNA (Ref.1/2). In this post I will add a BPF Band Pass Filter and examine the response of the BPF+LNA using the NanoVNA. Measurement Setup Figure 1 shows… Continue reading NanoVNA for 433MHz/70cm BPF+LNA Testing

Introduction In the previous post I tested a 433MHz LNA with a PlutoSDR as a signal generator and determined it had a wideband response over 100MHz – 800MHz with a gain of approx. 23dB. In this post I will do the same measurement but this time with a NanoVNA. I am always looking for an… Continue reading NanoVNA for 433MHz/70cm LNA Testing