RTL-SDR for Radio Astronomy – Signal Capture1

Introduction In the previous three posts I looked at my receiving equipment used for GOES16, to see if I could re-purpose it for reception of the so called hydrogen line at 1420MHz/21cm. I checked the dish for VSWR (Ref.1), and tested the LNA/BPF (Ref.2/3). The final step was to orient the dish for maximal reception… Continue reading RTL-SDR for Radio Astronomy – Signal Capture1

Radio Astronomy LNA/BPF Testing with NanoVNA

Introduction In the previous two posts (Ref.1/2) I looked at re-purposing my GOES16 equipment for reception of the so called hydrogen line at 1420MHz/21cm. I did a quick test on the LNA/BPF using an input random noise test. The bandpass was about 65MHz flat and 75MHz half way down the edges as shown in Figure… Continue reading Radio Astronomy LNA/BPF Testing with NanoVNA

RTL-SDR for Marine Weather on HF SITOR

Introduction In previous posts, I looked at receiving weather information over NOAA (Ref.1), GOES (Ref.2) and HF WEFAX (Ref.3). Various weather agencies also transmit marine weather information over HF SITOR (Simplex Teletype over Radio). SITOR is an RTTY teletype system with advanced features of error detection, redundancy and re-transmission not included in the regular Baudot… Continue reading RTL-SDR for Marine Weather on HF SITOR