Introduction Last year I was successfully able to receive cubesats EIRSAT-1, Veronika and ENSO. A key element in their reception was a 433MHz BPF+LNA (Ref.1). Recently new cubesats have been launched, but working at a frequency closer to 400MHz. My existing LNA is broadband but the BPF cuts off above 400MHz so it can’t be… Continue reading NanoVNA for 400MHz/70cm BPF+LNA Testing
PlutoSDR for WSPR on 2m & 6m_a
Introduction In previous posts, I looked at WSPR & FT8 as part of the WSJT-X protocol suite (Ref.1/6). In Ref.1, I reviewed the WSPR protocol and simulated it in Scicos. I received the signal using the RTL-SDR with HamItUp converter on 30m at 10.1387MHz. In Ref.3 I tested the PlutoSDR for possible application as a… Continue reading PlutoSDR for WSPR on 2m & 6m_a
Yagi Antenna for 138MHz Satellite Weather
Introduction Receiving Satellite Weather signals at 136/138MHz has been very exciting over the past several years. NOAA15/18/19 are now deactivated, but Meteor M2-3 & M2-4 are still available. I was able to receive these signals at Toronto Harbourfront with an open sky view (Ref.1). However, at my home QTH, this proved to be difficult with… Continue reading Yagi Antenna for 138MHz Satellite Weather
Signal Simulation Real R & Complex C
Introduction When I first started working with simulation software such as ScicosLab/Scicos fifteen years ago (Ref.1/2), I used Real signals. Later on when working with GNU Radio I discovered it was also possible to generate Complex signals. It is worth considering the differences between the two approaches. Fourier Transform Let’s do a quick review of… Continue reading Signal Simulation Real R & Complex C
Carrier Synchronization with Costas & Squaring Loops -Simulation
Introduction Costas & Squaring Loops are key components in reception of Telecommunication Signals. They are used to synchronize a local generated carrier with an incoming received carrier. We can simulate and study their operation using Scicos (Ref.1). First we generate a BPSK waveform at R=100bit/sec to use with our two Demodulators (Ref.2). BPSK Waveform Generation… Continue reading Carrier Synchronization with Costas & Squaring Loops -Simulation