Note this post doesn’t look any question about whether the paint affects signal reception. It only addresses whether the paint will work with a paint sprayer. **Hammerite** paint can be…
This is one of those things that sounds boring until it suddenly explains all your noise problems. Alright — let’s break it down in human terms. 🎙️ Unbalanced microphone input…
The answer isn’t “magic DSP.” It’s architecture. And a bit of ruthless engineering discipline. Modern SDRs don’t actually have “less noise” in the physics sense — they have more stable,…
Absolute workhorse of RF switching. WHAT IS A PIN DIODE? A PIN diode is a semiconductor diode with three layers: The middle layer is a thick, undoped (intrinsic) region. That…
WHAT IS A DICKE SWITCH? A Dicke switch is a rapid RF switch used in radio astronomy to reduce receiver gain drift. It switches quickly between: This technique was invented…
Professional radio astronomy dishes are engineered for electrical reflectivity, structural rigidity, thermal stability, and low weight. The exact construction depends on frequency range (long-wavelength vs millimetre work), but most large…
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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