Can 3dB amplifier compensate for 3dB loss in filter at 1420MHz?
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If I use a filter at 1420 MHz that causes 3 dB loss and in amplifier beforehand that gives 3dB gain, will that cancel it out? Not exactly — a…
2025
Using long Yagi antenna tuned for 1430 MHz for 1420 MHz
A long Yagi antenna tuned for 1430 MHz can still work at 1420 MHz, but with reduced efficiency and some detuning effects. Here’s a breakdown of what you can expect:…
TV satellite frequencies in the USA
TV satellite frequencies in the USA vary depending on the satellite, provider, and whether the service is free-to-air (FTA) or encrypted. Here’s a general overview: 🛰️ Main Satellite Bands Used…
Beamwidth, Half-Power Beamwidth, Field of View
The amount of sky covered by a radio telescope is typically referred to as its field of view (FoV). Key Terms: FoV≈λD radians\text{FoV} \approx \frac{\lambda}{D} \text{ radians} where λ\lambda is…
Results LRO-H2 Mapping exercise 11/4/2025-1/6/2025 (processed 1/6/2025)
These are the results so far of my mapping exercise with the 1.5m parabolic solar cooker dish (LRO-H2): Powerpoint Presentation containing slides at bottom of this page: https://www.astronomy.me.uk/wp-content/uploads/2025/06/Results-LRO-H2-Mapping-exercise-110425-010625-010625.pptx Individual slides:
LRO-H1 Map 2 (cf Wikipedia H-Line Map July 2024 proc 260425@2200) – labelled
This version of the map has been relabelled, due to errors in the previous labelling system.
Linux Ubuntu for Radio Astronomy: Script to install radio astronomy packages in Ubuntu
https://www.astronomy.me.uk/wp-content/uploads/2025/05/astro-radio-repo.zip https://www.astronomy.me.uk/wp-content/uploads/2025/05/astro-radio-setup.zip
Night Sky Talk for RAG 30/5/2025
https://www.astronomy.me.uk/wp-content/uploads/2025/05/Night-Sky-Talk-RAG-300525-FINAL-250525@1500.pptx https://www.astronomy.me.uk/wp-content/uploads/2025/05/Night-Sky-Talk-RAG-300525-FINAL-250525@1500.pdf
Cheapest way to make a new waveguide monopole
The waveguide in the centre of antennae sich as cantennae are made of a copper quarter wave monopole. The cheapest way to obtain a stiff enough short piece of copper…
ezRA (Easy Radio Astronomy): How to change Azimuth in a group of ezCol files after these were recorded using a parameter in ezCon 25/5/2025
The following parameters allow ezCon to override the azimuth or elevation embedded within the data files from ezCol and use the parameter added to the ezCon command line instead: -ezConAzimuth…