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Can orthogonal dual monopoles reduce signal strength in a cantenna? How is cross-polarisation measured?
Extract from SARA Mailing List 20-21/11/2025. https://www.astronomy.me.uk/wp-content/uploads/2025/11/Can-orthogonal-dual-monopoles-reduce-cantenna-signal-strength-Measuring-cross-polarisation-SARA-Mailing-List-20-211125.docx https://www.astronomy.me.uk/wp-content/uploads/2025/11/Can-orthogonal-dual-monopoles-reduce-cantenna-signal-strength-Measuring-cross-polarisation-SARA-Mailing-List-20-211125.pdf MESSAGES BELOW IN REVERSE CHRONOLOGICAL ORDER: From: ‘b alex pettit jr’ via Society of Amateur Radio Astronomers <sara-list@googlegroups.com>Sent: 21 November 2025 22:38.…
What is format used in data files produced by Radio Sky Pipe II Software?
Radio-SkyPipe II (R-SP) uses a binary proprietary file format for its data files. Here’s a breakdown of the format, based on the Radio-Sky documentation: File Format (Radio-SkyPipe II) Interpretation /…
How does sample rate relate to frequency and bandwidth on SDR?
In an SDR, three related but distinct concepts often get mixed together: frequency, bandwidth, and sample rate. Here’s how they actually fit together: 1. Frequency (centre frequency) This is simply…
Critical aspects of measurements when making a cantenna waveguide for radio astronomy. Extracts from SARA & BAA Radio Astronomy Group Mailing Lists 19/11/2025.
From Marcus D. Leech: Probe placement with regards to the distance from the back-short, probe length, and positioning of the waveguide at the proper dish<>feed spacing. That is, if you…
What is benefit of upgrading from 1m dish to 2.4m dish for hydrogen line?
This analysis is for a friend who has made this upgrade. The largest diameter dish we are currently using at LRO is 150cm dish made of 6 petals – soon…
What is a P-ESA antenna?
The **P-ESA antenna**, or **Planar Electrically Steered Array antenna**, is a type of antenna that allows for adaptive beamforming and scanning over a wide range of angles. This design is…
Leonid Meteor Show detection by radio scatter at Lichfield Radio Observatory (LRO) 17-18/11/2025
Some (not so great)evidence of Leonids detected at LRO on 143.050MHz, Graves. See increased intensity in early hours of 18/11/2025. However, this is nothing like the intensity of meteors in…
How heavy is light-weight 160cm satellite dish?
Good question. It depends a lot on the material (steel, aluminum, mesh vs solid) and how the “160 cm” is constructed. But here are some reference points + example: 🔍…
Eduard Mol’s new video about the 1 metre “mini maser telescope”
Hi all, I recently uploaded a new video to my channel about my 1 metre dish: I am planning to make a short series of video’s about observing the Sun,…