{"query": "AM broadcast (medium wave) — where the dial begins", "count": 20, "results": [{"id": "card_n_ba6d9264fa3c", "title": "AM broadcast (medium wave) — where the dial begins", "shelf": "science", "surface": "secular", "snippet": "530–1700 kHz; sealed wavelengths 565 m down to 176 m: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853f395b7bc986c323 . The waves are so long\nthat the TOWER is the antenna", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_n_a7ae37960cae", "title": "FM broadcast (VHF) — three-meter waves, line of sight", "shelf": "science", "surface": "secular", "snippet": "88–108 MHz; sealed: the 100 MHz wave is 2.99 m, and its quarter-wave whip is 74 cm —\nthe length of a car antenna, derived: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_n_c39a51a03b6f", "title": "Oscillator — LC resonance, the bench's own Schumann", "shelf": "science", "surface": "secular", "snippet": "Energy sloshing between a coil and a capacitor rings at f = 1/(2π√(LC)); sealed:\n100 µH with 100 pF gives 1.591 MHz — the middle of the AM broadcast band: https://narrowhighway.com/s/1ee0d3ed486453eee", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_n_9ab6ee5e792c", "title": "The radio horizon — why towers are tall", "shelf": "science", "surface": "secular", "snippet": "Pure geometry, sealed: from height h the horizon lies at √(2hR) — a 100 m tower\nreaches 35,695 m ≈ 35.7 km: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853f395b7bc986c323", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_c_9610a78874eb", "title": "The radio horizon — why towers are tall ↔ FM broadcast (VHF) — three-meter waves, line", "shelf": "connections", "surface": null, "snippet": "Every VHF/FM/TV coverage map is this square root wearing terrain.  — a concord the card itself states; mined + verified.", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_c_3d17f744950b", "title": "Pheromone and gene are both molecular signals", "shelf": "connections", "surface": null, "snippet": "Two chemical channels — one broadcasts to the colony, one to the daughter cell.", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_c_124f83f7a6fc", "title": "Radio-wave production — the chain leaves the ↔ AM broadcast (medium wave) — where the dial ", "shelf": "connections", "surface": null, "snippet": "A half-wave dipole\nfor it spans ~94 m — which is why AM stations use towers and crystal radios use long wires.  — a concord the card itself states; mined + verified.", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_c_9e441e079649", "title": "FM broadcast (VHF) — three-meter waves, line ↔ AM broadcast (medium wave) — where the dial ", "shelf": "connections", "surface": null, "snippet": "Frequency modulation carries the signal in the wave's TIMING rather than its height, which is why amplitude noise (lightning, ignition) mostly washes out — the static-resistance is structural, not mag", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_src_pron_broadcasts", "title": "broadcasts", "shelf": "pronunciation", "surface": "secular", "snippet": "broadcasts: pronounced (ARPABET) B R AO1 D K AE2 S T S. From the CMU Pronouncing Dictionary — the standard machine-readable pronunciations of North American English.", "authority_tier": "reference", "source": "CMU Pronouncing Dictionary (cmudict) — BSD-2-Clause, Carnegie Mellon", "readable": false, "generated": false}, {"id": "card_c_a62897562cbb", "title": "AM broadcast (medium wave) — where the dial  ↔ Shortwave (HF) — around the world on the ion", "shelf": "connections", "surface": null, "snippet": "at night the D-layer vanishes and signals bounce off the E/F layers for hundreds of miles  — a concord the card itself states; mined + verified.", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_src_word_broadcast_medium", "title": "broadcast medium", "shelf": "dictionary", "surface": "secular", "snippet": "broadcast medium: (noun) a medium that disseminates via telecommunications — syn: broadcasting", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_c_feb938352b59", "title": "FM broadcast (VHF) — three-meter waves, line ↔ The radio spectrum — one law from the cavity", "shelf": "connections", "surface": null, "snippet": "88–108 MHz; sealed: the 100 MHz wave is 2.99 m, and its quarter-wave whip is 74 cm — the length of a car antenna, derived: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_src_pron_broadcast", "title": "broadcast", "shelf": "pronunciation", "surface": "secular", "snippet": "broadcast: pronounced (ARPABET) B R AO1 D K AE2 S T. From the CMU Pronouncing Dictionary — the standard machine-readable pronunciations of North American English.", "authority_tier": "reference", "source": "CMU Pronouncing Dictionary (cmudict) — BSD-2-Clause, Carnegie Mellon", "readable": false, "generated": false}, {"id": "card_src_word_broadcasting", "title": "broadcasting", "shelf": "dictionary", "surface": "secular", "snippet": "broadcasting: (noun) a medium that disseminates via telecommunications — syn: broadcast medium · (noun) taking part in a radio or tv program", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_c_2d226e523064", "title": "The radio spectrum — one law from the cavity ↔ AM broadcast (medium wave) — where the dial ", "shelf": "connections", "surface": null, "snippet": "AM's 565 m and 176 m band edges  — a concord the card itself states; mined + verified.", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_c_34905309ba8c", "title": "AM broadcast (medium wave) — where the dial  ↔ The radio spectrum — one law from the cavity", "shelf": "connections", "surface": null, "snippet": "530–1700 kHz; sealed wavelengths 565 m down to 176 m  — a concord the card itself states; mined + verified.", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_c_3eab92dc34f4", "title": "The radio spectrum — one law from the cavity ↔ FM broadcast (VHF) — three-meter waves, line", "shelf": "connections", "surface": null, "snippet": "FM's 2.99 m wave and its 74 cm quarter-wave whip  — a concord the card itself states; mined + verified.", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_c_2e1c2ada4a8b", "title": "AM broadcast (medium wave) instantiates the spectrum walk", "shelf": "connections", "surface": null, "snippet": "One band of the sealed spectrum walk.", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_comms_noaa_weather", "title": "NOAA weather radio — the seven frequencies that warn you", "shelf": "communications", "surface": "secular", "snippet": "NOAA Weather Radio broadcasts continuous forecasts and emergency alerts on seven VHF frequencies: 162.400, 162.425, 162.450, 162.475, 162.500, 162.525, and 162.550 MHz. A cheap weather radio (or any s", "authority_tier": "reference", "source": "NOAA NWS — Weather Radio All Hazards (U.S. government, public domain)", "readable": false, "generated": false}, {"id": "card_works_subnet", "title": "How many hosts fit in a /24", "shelf": "the-works", "surface": "secular", "snippet": "A /24 subnet leaves 8 host bits — 2⁸ − 2 = 254 usable addresses, after reserving the network and broadcast. The daily arithmetic of every network.  Worked & sealed by the engine — /24 → 2⁸ − 2 = 254 u", "authority_tier": "verified", "source": "The Works — worked & sealed", "readable": false, "generated": false}], "house": {"door": "FIND", "kind": "cards", "trail": "results", "seal": null, "next_step": {"do": "open the top card", "door": "FIND", "tool": "card_get", "params": {"id": "card_n_ba6d9264fa3c"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}