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prop/docs/algo-reports/2026-05-04-recalibration.md
Graham McIntire 58f4a7714b
test: add Mox deps + SnmpClient poll/3 tests, RoadProximity, Buildings.Loader 
- Add {:mox, "~> 1.0", only: :test} to deps
- Commercial.SnmpClient: injectable snmp_runner for poll/3 tests (62→92%)
- Rover.RoadProximity: pure road_distances/3 tests with injectable fetch (37→82%)
- Buildings.Loader: ensure_loaded/1 with real tile file + quadkey tests (69→100%)
- Buildings.Index: records_near, mark_loaded, loaded? tests (72→96%)

Coverage: 77.96% → 78.93% (+0.97%)
2026-05-07 13:36:22 -05:00

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# Recalibration Analysis Report — 2026-05-04
> Auto-generated by `scripts/recalibrate_algo.py`. This report is the
> input for `algo.md` updates — diff against the prior dated section to
> see what's actually moved.
Connection: `postgres://prop:***@10.0.15.30:5432/prop`
Statement timeout: 20min
## Row counts and date ranges
| tbl | n | lo | hi |
|:---------------------|-------------:|:-----------|:-----------|
| contacts | 82084.000 | 1991-05-04 | 2026-05-02 |
| hrrr_native_profiles | 11472.000 | 2019-03-09 | 2025-09-21 |
| hrrr_profiles | 81302322.000 | 2016-09-17 | 2026-05-02 |
| iemre_observations | 28936.000 | | |
| narr_profiles | 395.000 | 1991-05-04 | 2014-09-19 |
| nexrad_observations | 7286.000 | 2019-08-17 | 2024-09-22 |
| propagation_scores | nan | | |
| soundings | 27745.000 | 1990-06-07 | 2026-05-04 |
| surface_observations | 648809.000 | 1991-05-03 | 2026-05-04 |
| terrain_profiles | 82084.000 | | |
## Data gaps and ingestion health
Severity legend: **BROKEN** = table is empty and feeds an active scoring path; **WARN** = populated but coverage is low enough to skew per-band statistics; **OK** = within spec or informational. Each non-OK row carries a one-line remediation hint.
| metric | value | severity | remediation |
|:-----------------------|--------:|:-----------|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| narr_rows | 395 | OK | |
| narr_pre2014_rows | 395 | OK | |
| hrrr_climatology_rows | 0 | BROKEN | Should self-heal within 24h via the daily 02:30Z cron that runs AdminTaskWorker(task=climatology). If still 0 after a day, check Oban dashboard for failed admin jobs. |
| hrrr_complete_contacts | 81278 | OK | |
| hrrr_pending_contacts | 806 | OK | |
| pre2014_contacts | 207 | OK | |
HRRR enrichment completeness: **99.0%** (81,278 complete / 806 pending).
### NARR coverage by year
Year-bucketed counts. NARR is supposed to span 1979 → 2014-10 at 3-hourly cadence (~2,920 timestamps per year per grid cell). Years far below the others are partial backfills the worker hasn't finished.
| year | profiles |
|---------:|-----------:|
| 1991.000 | 31.000 |
| 1992.000 | 4.000 |
| 1993.000 | 18.000 |
| 1994.000 | 19.000 |
| 1996.000 | 3.000 |
| 1997.000 | 8.000 |
| 1998.000 | 2.000 |
| 1999.000 | 11.000 |
| 2000.000 | 10.000 |
| 2001.000 | 14.000 |
| 2002.000 | 12.000 |
| 2003.000 | 36.000 |
| 2004.000 | 23.000 |
| 2005.000 | 49.000 |
| 2006.000 | 20.000 |
| 2007.000 | 44.000 |
| 2008.000 | 15.000 |
| 2009.000 | 17.000 |
| 2010.000 | 31.000 |
| 2011.000 | 4.000 |
| 2012.000 | 15.000 |
| 2013.000 | 3.000 |
| 2014.000 | 6.000 |
### HRRR enrichment status by year
Locate the pending backlog: a year with high `queued`/`failed`/`unset` counts is where HrrrFetchWorker needs to be rerun. Recent years dominating `queued` usually means the live Oban queue is stuck rather than a historical backfill gap.
| year | complete | queued | failed | unset |
|---------:|-----------:|---------:|---------:|--------:|
| 2014.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| 2015.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| 2016.000 | 2.000 | 0.000 | 0.000 | 0.000 |
| 2017.000 | 26.000 | 0.000 | 0.000 | 0.000 |
| 2018.000 | 2658.000 | 0.000 | 0.000 | 0.000 |
| 2019.000 | 13036.000 | 0.000 | 0.000 | 0.000 |
| 2020.000 | 10300.000 | 0.000 | 0.000 | 0.000 |
| 2021.000 | 11266.000 | 0.000 | 0.000 | 0.000 |
| 2022.000 | 14487.000 | 2.000 | 0.000 | 0.000 |
| 2023.000 | 13461.000 | 5.000 | 0.000 | 0.000 |
| 2024.000 | 13378.000 | 0.000 | 0.000 | 0.000 |
| 2025.000 | 2640.000 | 0.000 | 0.000 | 0.000 |
| 2026.000 | 24.000 | 0.000 | 0.000 | 0.000 |
## Contacts by band (≥50 MHz)
| band_mhz | contacts | avg_km | max_km |
|-----------:|-----------:|---------:|---------:|
| 222 | 7595 | 229.000 | 2306.000 |
| 432 | 9177 | 200.000 | 1752.000 |
| 902 | 1794 | 171.000 | 915.000 |
| 1296 | 2996 | 160.000 | 1752.000 |
| 2304 | 749 | 153.000 | 655.000 |
| 3400 | 351 | 151.000 | 643.000 |
| 5760 | 336 | 126.000 | 505.000 |
| 10000 | 54280 | 211.000 | 2393.000 |
| 24000 | 3815 | 96.000 | 710.000 |
| 47000 | 774 | 65.000 | 343.000 |
| 75000 | 117 | 57.000 | 289.000 |
| 122000 | 70 | 18.000 | 139.000 |
| 134000 | 5 | 65.000 | 157.000 |
| 142000 | 4 | 47.000 | 79.700 |
| 145000 | 2 | 40.000 | 79.600 |
| 241000 | 14 | 31.000 | 114.400 |
| 288000 | 1 | 1.000 | 1.246 |
| 322000 | 1 | 1.000 | 1.400 |
| 403000 | 1 | 1.000 | 1.400 |
| 411000 | 1 | 0.000 | 0.050 |
## Monthly sounding ducting
| month | soundings | ducting_pct | avg_min_grad | avg_pwat |
|--------:|------------:|--------------:|---------------:|-----------:|
| 1 | 103 | 27.200 | -179.200 | 10.400 |
| 2 | 131 | 29.000 | -163.100 | 7.900 |
| 3 | 93 | 17.200 | -157.200 | 8.900 |
| 4 | 330 | 24.200 | -155.500 | 11.300 |
| 5 | 360 | 48.100 | -269.200 | 23.900 |
| 6 | 396 | 68.900 | -352.900 | 31.600 |
| 7 | 304 | 67.100 | -292.500 | 29.600 |
| 8 | 5045 | 55.200 | -255.800 | 35.100 |
| 9 | 2345 | 56.300 | -280.000 | 27.300 |
| 10 | 179 | 55.300 | -304.800 | 18.300 |
| 11 | 194 | 45.400 | -237.300 | 11.600 |
| 12 | 158 | 25.900 | -182.400 | 10.800 |
## HRRR native-profile duct distribution (best supportable band)
| band_bin | profiles | avg_inv_top_m | avg_theta_e_jump | avg_richardson |
|:-----------|-----------:|----------------:|-------------------:|-----------------:|
| 15-30 GHz | 10 | 2091.000 | 5.900 | 8.690 |
| 30-75 GHz | 4 | 3860.000 | 5.000 | 12.120 |
| 5-15 GHz | 98 | 4408.000 | 25.700 | 12.550 |
| <5 GHz | 1432 | 2097.000 | 5.400 | 18.420 |
| none | 9928 | 11497.000 | 80.500 | 38.270 |
## Contact ↔ HRRR per-band Pearson correlations (matched n=81547)
| band_mhz | n | rho_pr | rho_dpc | rho_pwat | rho_sref | rho_grad | rho_tc | rho_hpbl |
|-----------:|----------:|---------:|----------:|-----------:|-----------:|-----------:|---------:|-----------:|
| 222.000 | 7518.000 | -0.014 | 0.077 | 0.068 | 0.087 | 0.040 | -0.081 | -0.039 |
| 432.000 | 9073.000 | 0.074 | 0.134 | 0.111 | 0.132 | 0.008 | -0.088 | -0.063 |
| 902.000 | 1754.000 | 0.080 | 0.097 | 0.050 | 0.090 | -0.039 | -0.070 | -0.029 |
| 1296.000 | 2951.000 | 0.025 | 0.103 | 0.053 | 0.110 | -0.077 | -0.041 | -0.051 |
| 2304.000 | 719.000 | 0.079 | 0.165 | 0.130 | 0.192 | -0.126 | -0.059 | -0.086 |
| 3400.000 | 335.000 | -0.026 | 0.154 | 0.150 | 0.221 | 0.061 | -0.061 | -0.024 |
| 5760.000 | 320.000 | 0.156 | 0.076 | 0.099 | 0.091 | 0.003 | -0.068 | -0.057 |
| 10000.000 | 54150.000 | -0.086 | -0.022 | -0.029 | 0.000 | 0.030 | -0.004 | 0.007 |
| 24000.000 | 3794.000 | -0.221 | -0.338 | -0.362 | -0.241 | 0.023 | -0.211 | -0.009 |
| 47000.000 | 757.000 | -0.256 | -0.215 | -0.233 | -0.054 | -0.021 | -0.113 | -0.079 |
| 75000.000 | 109.000 | -0.768 | -0.699 | -0.620 | -0.582 | 0.434 | -0.680 | 0.365 |
| 122000.000 | 63.000 | -0.041 | -0.129 | -0.127 | -0.248 | 0.355 | 0.039 | 0.400 |
## Per-band HPBL bin distance distribution
One table per band with ≥50 matched contacts. A band-specific effect here means HPBL belongs in the scorer for that band.
**222 MHz:**
| bin | n | avg_km | p50_km |
|:----------|-----:|---------:|---------:|
| <200 | 1224 | 266.100 | 205.500 |
| 200-500 | 1556 | 225.600 | 167.000 |
| 500-1000 | 1754 | 213.300 | 167.500 |
| 1000-1500 | 1426 | 223.700 | 170.000 |
| 1500-2000 | 1239 | 224.700 | 178.000 |
| >=2000 | 319 | 233.800 | 158.000 |
**432 MHz:**
| bin | n | avg_km | p50_km |
|:----------|-----:|---------:|---------:|
| <200 | 1579 | 224.500 | 178.000 |
| 200-500 | 1867 | 205.800 | 153.000 |
| 500-1000 | 2114 | 189.900 | 139.800 |
| 1000-1500 | 1683 | 196.800 | 148.000 |
| 1500-2000 | 1475 | 192.600 | 145.000 |
| >=2000 | 355 | 171.700 | 124.000 |
**902 MHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <200 | 271 | 198.300 | 162.000 |
| 200-500 | 366 | 164.900 | 138.000 |
| 500-1000 | 433 | 166.500 | 131.600 |
| 1000-1500 | 356 | 166.800 | 136.500 |
| 1500-2000 | 282 | 174.900 | 152.000 |
| >=2000 | 46 | 153.500 | 126.500 |
**1.296 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <200 | 443 | 174.500 | 145.000 |
| 200-500 | 612 | 173.100 | 133.500 |
| 500-1000 | 735 | 152.500 | 116.000 |
| 1000-1500 | 585 | 158.200 | 131.000 |
| 1500-2000 | 479 | 152.600 | 122.000 |
| >=2000 | 97 | 143.800 | 108.000 |
**2.304 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <200 | 101 | 167.000 | 151.000 |
| 200-500 | 131 | 182.200 | 157.000 |
| 500-1000 | 188 | 140.800 | 122.000 |
| 1000-1500 | 159 | 146.700 | 135.000 |
| 1500-2000 | 123 | 148.300 | 135.000 |
| >=2000 | 17 | 137.400 | 140.000 |
**3.4 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <200 | 54 | 143.100 | 122.000 |
| 200-500 | 60 | 178.200 | 141.000 |
| 500-1000 | 74 | 145.600 | 108.000 |
| 1000-1500 | 84 | 149.400 | 133.000 |
| 1500-2000 | 48 | 165.100 | 138.700 |
| >=2000 | 15 | 121.800 | 128.000 |
**5.76 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <200 | 37 | 148.800 | 108.000 |
| 200-500 | 54 | 138.400 | 135.000 |
| 500-1000 | 85 | 113.300 | 108.000 |
| 1000-1500 | 74 | 130.900 | 127.500 |
| 1500-2000 | 54 | 121.200 | 122.000 |
| >=2000 | 16 | 124.200 | 125.000 |
**10 GHz:**
| bin | n | avg_km | p50_km |
|:----------|------:|---------:|---------:|
| <200 | 10466 | 212.500 | 182.600 |
| 200-500 | 14330 | 205.900 | 179.500 |
| 500-1000 | 16463 | 208.700 | 190.300 |
| 1000-1500 | 8712 | 212.400 | 198.500 |
| 1500-2000 | 2985 | 201.200 | 179.000 |
| >=2000 | 1191 | 228.700 | 193.500 |
**24 GHz:**
| bin | n | avg_km | p50_km |
|:----------|-----:|---------:|---------:|
| <200 | 731 | 100.200 | 92.200 |
| 200-500 | 1079 | 91.500 | 87.700 |
| 500-1000 | 1179 | 94.800 | 87.700 |
| 1000-1500 | 534 | 98.500 | 95.700 |
| 1500-2000 | 196 | 99.900 | 99.400 |
| >=2000 | 75 | 74.300 | 31.800 |
**47 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <200 | 172 | 67.100 | 63.600 |
| 200-500 | 237 | 62.600 | 61.300 |
| 500-1000 | 253 | 61.900 | 65.400 |
| 1000-1500 | 58 | 71.000 | 70.900 |
| 1500-2000 | 29 | 33.500 | 23.700 |
| >=2000 | 8 | 33.900 | 32.300 |
**75 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <200 | 19 | 18.600 | 19.600 |
| 200-500 | 31 | 44.300 | 36.700 |
| 500-1000 | 53 | 58.800 | 36.700 |
| 1000-1500 | 6 | 56.100 | 29.800 |
**122 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <200 | 7 | 4.400 | 5.000 |
| 200-500 | 27 | 8.800 | 8.000 |
| 500-1000 | 18 | 13.600 | 7.000 |
| 1000-1500 | 6 | 78.500 | 85.500 |
| 1500-2000 | 3 | 10.000 | 12.000 |
| >=2000 | 2 | 5.000 | 5.000 |
## Per-band pressure bin distance distribution
Surface pressure tends to proxy synoptic-scale stagnation, so we want to see longer distances under the 1015-1025 mb ridge at every band that ducts.
**222 MHz:**
| bin | n | avg_km | p50_km |
|:----------|-----:|---------:|---------:|
| <990 | 2720 | 227.200 | 178.000 |
| 990-1000 | 1926 | 255.100 | 201.000 |
| 1000-1010 | 1799 | 233.800 | 186.000 |
| 1010-1020 | 953 | 181.400 | 131.000 |
| >=1020 | 120 | 166.100 | 132.000 |
**432 MHz:**
| bin | n | avg_km | p50_km |
|:----------|-----:|---------:|---------:|
| <990 | 3536 | 188.800 | 141.000 |
| 990-1000 | 2278 | 226.700 | 178.000 |
| 1000-1010 | 1832 | 210.900 | 156.500 |
| 1010-1020 | 1264 | 174.100 | 128.000 |
| >=1020 | 163 | 159.000 | 121.000 |
**902 MHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <990 | 590 | 154.100 | 127.000 |
| 990-1000 | 510 | 203.200 | 157.500 |
| 1000-1010 | 369 | 189.200 | 148.000 |
| 1010-1020 | 249 | 139.200 | 143.000 |
| >=1020 | 36 | 79.700 | 51.500 |
**1.296 GHz:**
| bin | n | avg_km | p50_km |
|:----------|-----:|---------:|---------:|
| <990 | 1038 | 155.400 | 125.000 |
| 990-1000 | 800 | 183.100 | 146.000 |
| 1000-1010 | 620 | 165.400 | 117.000 |
| 1010-1020 | 444 | 132.400 | 114.000 |
| >=1020 | 49 | 119.800 | 101.000 |
**2.304 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <990 | 190 | 146.500 | 134.000 |
| 990-1000 | 250 | 155.000 | 122.000 |
| 1000-1010 | 144 | 172.600 | 134.000 |
| 1010-1020 | 121 | 147.600 | 152.000 |
| >=1020 | 14 | 127.600 | 137.000 |
**3.4 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <990 | 95 | 154.400 | 136.000 |
| 990-1000 | 159 | 159.200 | 134.000 |
| 1000-1010 | 45 | 166.000 | 140.000 |
| 1010-1020 | 27 | 111.700 | 98.000 |
| >=1020 | 9 | 114.600 | 131.000 |
**5.76 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <990 | 86 | 106.000 | 105.500 |
| 990-1000 | 139 | 133.200 | 111.000 |
| 1000-1010 | 51 | 136.100 | 104.000 |
| 1010-1020 | 34 | 143.200 | 152.000 |
| >=1020 | 10 | 140.600 | 139.000 |
**10 GHz:**
| bin | n | avg_km | p50_km |
|:----------|------:|---------:|---------:|
| <990 | 27142 | 221.800 | 213.500 |
| 990-1000 | 13469 | 181.200 | 158.600 |
| 1000-1010 | 7236 | 204.000 | 175.200 |
| 1010-1020 | 4658 | 218.700 | 175.300 |
| >=1020 | 1645 | 229.300 | 207.600 |
**24 GHz:**
| bin | n | avg_km | p50_km |
|:----------|-----:|---------:|---------:|
| <990 | 1485 | 100.900 | 96.500 |
| 990-1000 | 1462 | 87.200 | 81.000 |
| 1000-1010 | 463 | 114.400 | 113.400 |
| 1010-1020 | 258 | 70.900 | 72.100 |
| >=1020 | 126 | 102.700 | 89.600 |
**47 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <990 | 279 | 68.500 | 70.900 |
| 990-1000 | 297 | 58.000 | 57.300 |
| 1000-1010 | 63 | 69.600 | 68.000 |
| 1010-1020 | 89 | 60.600 | 65.400 |
| >=1020 | 29 | 43.400 | 42.000 |
**75 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <990 | 55 | 65.300 | 57.300 |
| 990-1000 | 32 | 17.500 | 10.400 |
| 1000-1010 | 12 | 71.800 | 89.800 |
| 1010-1020 | 8 | 18.300 | 19.600 |
| >=1020 | 2 | 11.700 | 11.700 |
**122 GHz:**
| bin | n | avg_km | p50_km |
|:----------|----:|---------:|---------:|
| <990 | 22 | 12.000 | 7.000 |
| 990-1000 | 19 | 27.300 | 7.000 |
| 1000-1010 | 10 | 8.400 | 6.000 |
| 1010-1020 | 10 | 13.400 | 8.000 |
| >=1020 | 2 | 12.000 | 12.000 |
## Contact ↔ NARR per-band Pearson correlations (pre-2014 only, matched n=201)
Historical sanity check: if the HRRR-era signs and magnitudes survive on 30+ years of NARR reanalysis, the scoring factors are physical rather than HRRR-artefact. Diverging signs = flag it.
| band_mhz | n | rho_pr | rho_dpc | rho_pwat | rho_sref | rho_grad | rho_tc | rho_hpbl |
|-----------:|--------:|---------:|----------:|-----------:|-----------:|-----------:|---------:|-----------:|
| 10000.000 | 103.000 | -0.402 | -0.402 | -0.402 | -0.234 | -0.222 | -0.402 | -0.402 |
## NEXRAD composite reflectivity vs distance (matched n=20525)
Rain-attenuation sanity check — one table per band with ≥50 matched contacts. At rain-sensitive bands (24+ GHz) higher `max_dbz` should map to shorter contacts; at 10 GHz and below the effect should be barely detectable.
**10 GHz:**
| bin | n | avg_km | p50_km |
|:-----------------|------:|---------:|---------:|
| none (<5) | 13803 | 207.900 | 193.500 |
| drizzle (5-20) | 1270 | 201.800 | 200.400 |
| light (20-30) | 1696 | 209.600 | 187.900 |
| moderate (30-45) | 1594 | 229.500 | 213.900 |
| heavy (>=45) | 675 | 191.600 | 146.300 |
**24 GHz:**
| bin | n | avg_km | p50_km |
|:-----------------|----:|---------:|---------:|
| none (<5) | 868 | 91.500 | 83.700 |
| drizzle (5-20) | 74 | 108.300 | 123.200 |
| light (20-30) | 151 | 88.200 | 70.900 |
| moderate (30-45) | 76 | 109.300 | 122.400 |
| heavy (>=45) | 49 | 86.600 | 102.300 |
**47 GHz:**
| bin | n | avg_km | p50_km |
|:-----------------|----:|---------:|---------:|
| none (<5) | 186 | 52.400 | 56.000 |
| light (20-30) | 30 | 59.300 | 66.300 |
| moderate (30-45) | 9 | 75.100 | 81.600 |
| heavy (>=45) | 15 | 71.400 | 82.800 |
## hrrr_native_profiles.best_duct_band_ghz vs distance (matched n=56845)
Validates the 1.15× boost in `Scorer.score_refractivity/4`: contacts where the native duct supports the target band should run longer than those where it does not. One table per band with ≥50 matched contacts.
**10 GHz:**
| bin | n | avg_km | p50_km |
|:----------|------:|---------:|---------:|
| none | 44655 | 211.200 | 192.400 |
| <5 GHz | 7073 | 200.000 | 169.300 |
| 5-10 GHz | 439 | 199.000 | 174.200 |
| 10-24 GHz | 146 | 204.700 | 242.700 |
| 24-47 GHz | 5 | 176.600 | 133.300 |
| >=47 GHz | 23 | 147.800 | 131.500 |
**24 GHz:**
| bin | n | avg_km | p50_km |
|:----------|---------:|---------:|---------:|
| none | 3183.000 | 94.800 | 92.200 |
| <5 GHz | 473.000 | 98.600 | 84.900 |
| 5-10 GHz | 36.000 | 97.500 | 113.700 |
| 10-24 GHz | 2.000 | 44.700 | 44.700 |
| >=47 GHz | 6.000 | 131.500 | 131.500 |
**47 GHz:**
| bin | n | avg_km | p50_km |
|:---------|--------:|---------:|---------:|
| none | 552.000 | 64.300 | 65.400 |
| <5 GHz | 131.000 | 56.800 | 61.800 |
| 5-10 GHz | 6.000 | 98.100 | 113.700 |
**75 GHz:**
| bin | n | avg_km | p50_km |
|:-------|-------:|---------:|---------:|
| none | 77.000 | 54.200 | 36.700 |
| <5 GHz | 15.000 | 13.900 | 14.600 |
## Commercial-link rx_power degradation vs contemporaneous DFW contacts (matched n=12)
Pearson(degradation_db, distance_km) = **0.318**
| bin | n | avg_km | p50_km |
|:---------------------|----:|---------:|---------:|
| negative/0 (no fade) | 10 | 134.500 | 122.500 |
| 3 dB noise floor | 2 | 119.500 | 119.500 |
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