Common Ferrite Types (and Their Useful Range)Ferrite MaterialﾠTypical Trade NameﾠEffective Range (MHz)ﾠTypical Use#31ﾠFair-Rite mix 31ﾠ1 – 300 MHzﾠWideband RFI suppression (HF/VHF)#43ﾠFair-Rite mix 43ﾠ25 – 300 MHzﾠVHF suppression#61ﾠFair-Rite mix 61ﾠ200 –…
External power from a low-noise amplifier (LNA) can potentially cause problems with an SDR (Software Defined Radio), depending on how the power is supplied and whether the SDR’s RF input…
The “loss surface area” from a prime-focus feed is just the blocked (shadowed) aperture from the feed assembly (feed + support struts). You can estimate it with: So: Ablocked≈Afeed+N w D2,Fraction blocked=AblockedAdishA_\text{blocked}…
The weight of a 6 ft × 4 ft sheet of plywood depends on its thickness and the wood species/density. Let’s go step by step: 1. Area of sheet 6…
Weight of a 5 ft × 5 ft sheet of fine aluminium window screening. Let’s work it out step by step: 5 ft×5 ft=25 ft^2. 25 ft^2×0.035 lb/ft^2≈0.875 lb. That’s…
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…
Click below to download: https://www.astronomy.me.uk/wp-content/uploads/2025/03/Nooelec-LANA-Wideband-Low-Noise-Amplifier-Product-Specification-Sheet-Mar-2025.pdf
Those are called anti-static bags or ESD (Electrostatic Discharge) bags. They are used to protect sensitive electronic components from static electricity damage during storage and transport. There are two main…
Alex Pettit, of SARA, has recommended a design for making a cantenna based on using aluminium roof flashing wraped in layers to produce a tube, and a 6 inch cake…
Admin