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NTMS Propagation Path calculator

Path Calculator

Point-to-point prediction over HRRR profiles, SRTM terrain and ITU-R P.676 / P.530.

33.3, -96.2 · EM13wh · 8.0 ft AGL

33.1, -96.6 · EM13qc · 60.0 ft AGL
A callsign resolves through QRZ's mailing address, then geocoding — the position may be off from where the station actually operates.
Band
Station

Path calculation complete.

HRRR 08:00z · 9/9 path points
Distance
47.6
km · 29.6 mi
Bearing
244.7°
true · rev 64.7°
Terrain
BLOCKED
46.5 dB diffraction
Propagation
62/100
MARGINAL
Margin
+15.5
dB over CW threshold
Terrain profile · SRTM 30 m + canopy + MS footprints
Line of sight 1st Fresnel Duct layer Horizon ray Common volume

Over the horizon: the two horizon-skimming rays intersect at the common volume22 m AGL at the midpoint (67 m above the chord, 33 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 12.2 m) clears with margin. The geometric line of sight is obstructed — buried 15 m below terrain at its worst point.

Great circle
33.304, -96.154 → 33.12, -96.615 · 244.7°
Loss budget · 24 GHz
FSPL (free-space) 153.6 dB
Gaseous (O₂ + H₂O) 2.3 dB
Diffraction 46.5 dB
Rain attenuation 0.0 dB
Total path loss 202.5 dB
Gas rate 0.0490 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 14.5 g/m³
Power budget
TX power 20.0 dBm (100.0 mW)
TX antenna gain 30.0 dBi
Feed loss (×2) -2.0 dB
EIRP 48.0 dBm
Path loss -202.5 dB
RX antenna gain 30.0 dBi
RX power -124.5 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin 15.5 dB
Path weather · HRRR average of 9 samples
Temperature
72.3 °F
22.4 °C
Dewpoint
63.1 °F
17.3 °C
T/Td gap
9.2 °F
5.1 °C
Abs. humidity
14.5
g/m³
Pressure
986.9
mb
PWAT
22.0
mm
BL depth
237.2
m AGL
Refrac. gradient
-123.7
N/km · super-refractive
Propagation factors · 24 GHz 62/100
Rain
100 14%
Humidity
0 13%
PWAT
60 11%
Season
47 11%
T-Td Depression
60 10%
Refractivity
72 10%
Pressure
82 10%
Sky Cover
50 8%
Wind
50 8%
Time of Day
55 4%
Atmospheric profile HRRR 3 km Valid 2026-05-15 08:00 UTC · 9 samples
Point Lat, lon Temp Dewpt Press dN/dh BL m PWAT Duct
Source 33.3, -96.2 20.6 °C 18.0 °C 988.1 mb -102.5 246.4 22.5 mm
13% 33.3, -96.2 22.0 °C 17.5 °C 986.9 mb -123.7 228.7 21.5 mm
25% 33.3, -96.3 22.0 °C 17.5 °C 986.9 mb -123.7 228.7 21.5 mm
38% 33.2, -96.3 22.6 °C 17.1 °C 991.2 mb -122.6 233.9 21.8 mm
Midpoint 33.2, -96.4 22.6 °C 17.1 °C 991.2 mb -122.6 233.9 21.8 mm
63% 33.2, -96.4 22.9 °C 17.0 °C 988.8 mb -123.5 237.3 21.9 mm
75% 33.2, -96.5 22.2 °C 17.6 °C 991.0 mb -120.9 229.6 22.7 mm
88% 33.1, -96.6 22.2 °C 17.6 °C 991.0 mb -120.9 229.6 22.7 mm
Destination 33.1, -96.6 24.1 °C 16.0 °C 987.4 mb -91.5 266.6 22.0 mm
Midpoint vertical profile
18-hour forecast · this path · 24 GHz → steady
Propagation score for this path over the next 18 hours. 0 25 50 75 100
Peak 64 at 08:00 UTC · low 56 at 23:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 64 MARGINAL
09:00 62 MARGINAL
10:00 61 MARGINAL
11:00 62 MARGINAL
12:00 61 MARGINAL
13:00 61 MARGINAL
14:00 62 MARGINAL
15:00 61 MARGINAL
16:00 58 MARGINAL
17:00 59 MARGINAL
18:00 60 MARGINAL
19:00 59 MARGINAL
20:00 62 MARGINAL
21:00 63 MARGINAL
22:00 58 MARGINAL
23:00 56 MARGINAL
00:00 58 MARGINAL
01:00 · now 57 MARGINAL