Rev-B two-chamber box — coupler below, two LR1121s inside the double lid

915 MHz · 95×95×41.5 mm 3-part print (base / double lid / top), all parts print flat, no supports · coupler cavity 90×90×18 (first cavity mode ≈2.36 GHz — clear of 915 and its 2nd harmonic), radio bay 16 mm above the divider with two LR1121 modules on bosses · NO connectors through the shield: captive double-shielded pigtails (30 cm RG223 to the antennas) pass through fully-closed Ø6.2 glands, outer braid soldered 360° into the Cu-tape wrap — the gland360 scheme measured −57 dB common-mode in FDTD (vs straps −40, straps+λ/4 sleeve −59, unbonded/no box −21) · Σ/Δ to the radios cross the divider as double-shield micro-coax through pass-holes with 360° solder rings · Cu-tape wrap: base skin + divider skin + bay walls, base↔bay seam closed by a vertical tape band — the TOP LID stays bare plastic (the coupler's CM shell is base+divider skins and the LR1121 modules carry their own can shields, so a taped top adds nothing) · interactive 3D below: two-stage explode (double lid off the base, top lid above) with hideable layers: top lid / double lid + radios / Cu-tape wrap / solder joints

⬗ stack-up: 3D print, 3 flat parts 95×95×41.5 mm · Cu-tape wrap + seam band · captive RG223 ×2 (antennas) + double-shield micro-coax Σ/Δ · 2× LR1121 in the lid bay

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