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Introduction In the previous four posts I looked at re-purposing my receiving equipment used for GOES16 for reception of the so called hydrogen line at 1420MHz/21cm (Ref.1/4). I found that reception from my home location was not possible due to heavy interference or intermod. I did a brief study to get a handle on this.… Continue reading RTL-SDR for Radio Astronomy – EM Interference

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

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

Introduction In the previous post 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. The L band dish had a reasonable VSWR at 1420MHz, but the LNA/BPF was not suitable as it was centred on 1694MHz. I ordered… Continue reading RTL-SDR for Radio Astronomy-LNA/BPF Testing

Introduction Recently I designed a semi-permanent balcony mount for my GOES16 satellite dish. Last year, I was able to receive images over a ten minute period just balancing the dish, but this time I was able to download for hours on end. Receiving those images from 42000Km in space was truly amazing. It brought we… Continue reading RTL-SDR for Radio Astronomy-Planning