Introduction Many satellite systems such as Meteor & Inmarsat use QPSK Quadrature Phase Shift Keying type modulation. There are various types of QPSK that enhance certain properties such as OQPSK Offset QPSK. We can simulate these signals in Scicos to study their differences (Ref.1). QPSK Scicos Simulation Figure 1 shows a Scicos schematic used to… Continue reading Satellite QPSK/OQPSK Simulation
Category: Electronics
Electronics: Hardware, Simulation Software, Microcontrollers
NanoVNA for Hydrogen Line BPF+LNA Testing
Introduction In several previous posts I tested a 137MHz & 433MHz [BPF+LNA] for their frequency response or S21 using the NanoVNA (Ref.1/3). In this post I will use the same procedure to test the Hydrogen Line H1 [BPF+LNA] unit. Measurement Setup Figure 1 shows the Block Diagram of the Equipment Setup. The [BPF+LNA] is fed… Continue reading NanoVNA for Hydrogen Line BPF+LNA Testing
Trimming SDR IQ Raw Data
Introduction When working with SDR# on Windows, I can save reception data using either the ‘Baseband: Simple Recorder’ or ‘Audio: Simple Recorder’. In either case the files can be opened and manipulated in Audacity because they have a .wav file extension. The Baseband files have a sample rate equal to the Rx samp_rate and the… Continue reading Trimming SDR IQ Raw Data
NanoVNA for 2m/70cm 3dB Antenna Coupler
Introduction Recently I have been working with receiving various weather and cube satellites. I decided it would be worthwhile to improve reception from my home location by combining various different types of antennas. To this end I purchased an RF combiner/splitter which I will test with the NanoVNA. Measurement Setup Figure 1 shows the test… Continue reading NanoVNA for 2m/70cm 3dB Antenna Coupler
CubeSat ENSO on GNURadio
Introduction This past summer I was able to successfully receive Cubesats EIRSAT-1 and Veronika (Ref.1/6). Both Cubesats have since decayed from orbit according to the SatNOGS database. Looking through the gr_satellites supported Cubesats, I noticed that ENSO was operational having been launched recently in 2023. ENSO or ROBUSTA-1E is a 1U Cubesat developed by the… Continue reading CubeSat ENSO on GNURadio