Statistical resolution limit (SRL) — closest two targets tellable apart vs SNR · hover a point (session 014z DF model)
10.4 dBi D (PML_8) · 10.2 dBi realized (η 96%) · F/B 17 dB · E-HPBW 50° · S11 −17 dB @915 PML (−33 dB MUR-tuned, res 915.0) · Zdiff 39−j6 · BW(−10 dB) ~50 MHz — covers 902–928 ISM · worst 3D lobe −11.4 dBc (θ=28° elevated rear — the az cut alone overstates rear rejection by 5.5 dB) · ONE PIECE cut from 2 mm copper-clad FR4, NO etching: outline + 8 drills, no interior plunge cuts · split driven + CUT-IN HAIRPIN beta match (straps = arm support + DC ground + shunt L, d=22) · boom necked to 6 mm through the feed → coax pigtails split only ±10 mm · centre→+y arm, shield→−y arm, Ø2.0 anchor holes · 1:1 choke (4–5 beads mix 43) at the feed, coax down the boom (virtual-ground line), exits rear · 2× M4 rear mount · 334×145 mm · folded-DE variant tried & rejected: boom-through fold parks +j~100 across the feed (same as folded_yagi) · double-sided stock: same cut reads ~+14 MHz / R≈80 (S11 −12, VSWR 1.7) — print the template at 98.5% to centre it; single-sided preferred
⬗ stack-up: copper-clad FR4 2.0 mm (εr 4.3) · cut through copper+FR4, no etching · one piece + coax
