Category: Electronics

Introduction In the previous post (Ref.1), I was able to receive the hydrogen Line at 1420MHz. This was probably the most difficult thing I have done in the past two years, it took 2 months of planning and trial and error measurements at all times of the day and various azimuths & elevations. I tried… Continue reading Radio Astronomy – FFT Averaging on GNURadio

Introduction In the previous five 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 (Ref.1/5). Over several weeks I tried and experimented with various times/configurations but was not able to receive the hydrogen line. Finally I took… Continue reading RTL-SDR for Radio Astronomy – Signal Capture2

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