Settings on plotter in Spectrum Lab software – the title is the frequency of the VLF transmitter observed in kHz: Plot from first light at LRO on Spectrum Lab –…
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Flocculi are those mottled, cloud-like patches you see best in H-alpha or Ca II K light — they’re magnetic field regions showing up in the chromosphere. But the “bright vs…
The “rules of thumb”: c/o Ed Harfmann: Foil coating waveguide (if making waveguide with aluminium foil) wrinkled – Is it more than 1/20th of a wavelength? 21 cm/20 = 1.05…
Following information is from Alex Pettit:
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):…
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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…
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…
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…
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