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Losses at the masthead in hydrogen line systems
Nooelec’s documentation lists the SAWbird+ H1 (no 50 Ω “reference” termination present) at ≈0.8 dB NF and the versions that include the internal 50 Ω reference/termination at ≈1.05 dB NF…
To install Tkinter on Linux Ubuntu
To install Tkinter on Ubuntu, open a terminal and run the following commands: This will install the Tkinter library, allowing you to create interactive GUI applications with Python. pythonguis.com realpython.com…
Installing & Testing USB Relay on Linux Ubuntu
Prerequisites Before testing the USB relay, ensure you have the following installed: Installation Steps bash Copy Code sudo apt-get update sudo apt-get install git python3 libhidapi-dev libhidapi-hidraw0 python3-pip bash Copy…
Parabolic dish focal ratios & spillover angles
From Alex Pettit 2-3/12/2025: Its related to the Feed Beam Pattern and the Shape ( f/D Depth ) of the dish. “All” f/D 0.35 dishes perform similarly regardless of diameter…
Applying the Nyquist theorem to radio astronomy
Great question — this is a very common confusion when first applying the Nyquist theorem to radio astronomy. You do not need a 2.8 GHz sample rate to observe the…
Nyquist theorem explanation
Here is the Nyquist explanation rewritten using pure ASCII diagrams (no Unicode). Nyquist Theorem (ASCII Version) The Nyquist theorem says: This minimum rate is the Nyquist rate. 1. Sine wave…
Tohtsu CX-520D coaxial relay product info from DX Shop 3 December 2025
https://www.astronomy.me.uk/wp-content/uploads/2025/12/Tohtsu-CX-520D-product-info-from-DX-Shop-031225-reduced.pdf
I have installed usbrelay softwate on Ubuntu for my 4 relay control board (which works on Windows). Running the command usbrelay detects device but can’t open it.
I have installed usbrelay softwate on Ubuntu for my 4 relay control board (which works on Windows). Running the command usbrelay detects device but can’t open it. If usbrelay sees…