In a cantenna for 1420 MHz, how far from bottom of can should be the monopole? Short answer: place the monopole about a quarter of the waveguide wavelength (λg/4) up…
Andrew Sutkowski checked his feed and found monopole probe made of 1/8 inch copper tube far better at picking up 1420 MHz hydrogen signal than bare copper wire (information from…
Here’s a comparison of typical power consumption (no peripherals or display) for each device, measured at the wall under different workloads. Device Idle Power Moderate Load (e.g. data logging, web,…
A Kumar choke (often called the VE4MA or Kumar feed/choke) is a choke-ring / cavity around a horn/feed that suppresses unwanted surface and coaxial currents and “traps” or reflects energy…
Short answer: No—the dish doesn’t change the waveguide dimensions of the cantenna.The can’s internal diameter and the probe/back-short geometry are set by your operating frequency and waveguide mode, not by…
Link below downloads video MP4 file:
https://www.astronomy.me.uk/wp-content/uploads/2025/11/Proposed-club-RA-projects-Walsall-Astro-Soc-131025-DRAFT-031125@1700.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/11/Proposed-club-RA-projects-Walsall-Astro-Soc-131025-DRAFT-031125@1700.pptx
https://www.astronomy.me.uk/wp-content/uploads/2025/11/Results-drift-scan-LRO-H2-two-orthogonal-monopoles-for-SARA-RTOP-021125.pptx
https://www.astronomy.me.uk/wp-content/uploads/2025/11/Beta-ezCol-SDRplay-Data-Analysis-First-Light-for-SARA-RTOP-021125.pptx https://www.astronomy.me.uk/wp-content/uploads/2025/11/LRO-H2_RSPduo_251102_00.zip https://www.astronomy.me.uk/wp-content/uploads/2025/11/Ted-Clines-new-ezCol-and-SDRplay-drivers-251101a.zip
SDR Play RSPduo – in gr-sdrplay3 module in GNU Radio it asks me to put in separate sample rate in options separate to center frequency. For 1420 MHz what sample…
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