How to test Nooelec SAWBird H1 LNA using a NanoVNA
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Following information is from Alex Pettit:
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Skin depth of copper and aluminium, and its implications for building radio telescopes
The skin depth (δ) of RF in copper at 1420 MHz can be calculated using the formula: δ = √(2/(ωμσ)) Where: At f = 1420 MHz (the hydrogen line frequency):…
Construction manuals for VLF aerials for UKRAA VLF/SID Receiver and SuperSID Receiver
https://www.astronomy.me.uk/wp-content/uploads/2026/02/SuperSID-Manual.pdf https://www.astronomy.me.uk/wp-content/uploads/2026/02/VLF_Aerial_Assembly_Manual.pdf
Current state of construction of John Berman VLF/SID receiver and aerial system 13/2/2026
I’ve discovered following works with Spectrum Lab software on my Dell M6800 laptop: Plug audio cable into microphone socket on Dell M6800. Select line in rather than microphone when pop-up…
Table showing SWG sizes in imperial and metric to help choose brass tube sizes for making tuneable monopoles for cantennas
Here’s a clean SWG table from 16 down to 30. Diameters shown in inches and millimetres. SWG Inches mm 16 0.0640″ 1.626 mm 17 0.0560″ 1.422 mm 18 0.0480″ 1.219…
Paradar X-400 coaxial cable
I have just taken delivery of 5m run of Paradpr X-400. This is meant to be a cheaper alternative to LMR-400 cable, but with similar specifications. My initial impression is…
Building tuneable waveguide probe
Since you’re building a tuneable waveguide probe (I’m assuming 1420 MHz given your past adventures…), here’s a clean, mechanically stable way to do it without it turning into a wobbly…
What brass tube will snugly fit inside or outside 1/8 inch diameter brass tubing, for making a tuneable cantenna monopole probe?
Here are the standard brass tube sizes that will fit snugly either inside or outside 1/8-inch brass tubing: 📏 Basic Dimensions of 1/8″ Brass Tube So you want tubing whose…
My new theory of Quantum Gravity……and why it doesn’t work!
The Theory: I have been thinking about how quantum physics joins up to gravity. How about this? Quantum physics tells us you can’t know whether something is present with certainty,…