QUESTION:Testing antenna aimed at cold sky vs hot ground – can this be conducted in daytime or must it be done at night i.e. does sunshine or even sun behind…
https://files.ad.thornett.net/astronet/LRO-H2_Monopole2_33_281225@1209.mp4
The idea here is to reduce variations in LNA performance as power spikes up and down in power supplies by using a linear power supply.
The following are suggestions from ChatGPT (effectiveness not verified, 27/12/2025): Easy Radio Astronomy (ezRA) expects a stable reference channel so it can compare amplitude and/or phase changes against the sky…
Andy, A directional coupler is a device which allows RF to pass along one path in either direction with very low insertion loss while tapping off a reference signal at…
On SARA Mailing list from Alex Pettit 27/12/2025 re screen shielding fabrication to reduce RFI:
From Robert Meade, SARA mailing list 24/12/2025: Rather than using Dicke switching of the RF path between the antenna and a resistor as a noise source with PIN diodes, physical…
Hi All I hope you have enjoyed Christmas Day – I have just processed the first part of my data set using one month per drift scan elevation = the…
Here is what you need to build your own Cantenna: Doing the math:Use an online calculator, such as the one at https://www.jefatech.com/products/cnfbst?keyword=cantenna, or https://www.changpuak.ch/electronics/cantenna.php, https://www.wikarekare.org/Antenna/WaveguideCan.html to check can size and…
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