Graham McIntire
91c8cc9bc7
Both bands share the physics of low microwave: humidity and refractivity gradient build ducts the same way, and rain + gas absorption are effectively zero at VHF/UHF. humidity_effect is :beneficial, rain_k / rain_alpha are (0, 1), and o2_db_km / h2o_coeff are 0. Range estimates reflect tropo reality: 2m ducts can reach 2500+ km under exceptional conditions (e.g. documented Hawaii ↔ California openings), 70cm a bit less. The seasonal base matches the low-microwave summer-peak curve. These configs do NOT capture sporadic-E, meteor scatter, or aurora — those need ionospheric data (GIRO ionosondes, NOAA SWPC) we don't yet ingest. The scoring on these bands is therefore "tropo-only" and will underestimate openings driven by ionospheric modes. |
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