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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.

33.6, -99.2 · EM03jn · 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
244.2
km · 151.7 mi
Bearing
100.6°
true · rev 280.6°
Terrain
BLOCKED
137.4 dB diffraction
Propagation
63/100
MARGINAL
Margin
-97.8
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 volume585 m AGL at the midpoint (1755 m above the chord, 877 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 27.6 m) clears with margin. The geometric line of sight is obstructed — buried 870 m below terrain at its worst point.

Great circle
33.55, -99.193 → 33.12, -96.615 · 100.6°
Loss budget · 24 GHz
FSPL (free-space) 167.8 dB
Gaseous (O₂ + H₂O) 10.6 dB
Diffraction 137.4 dB
Rain attenuation 0.0 dB
Total path loss 315.8 dB
Gas rate 0.0435 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 11.7 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 -315.8 dB
RX antenna gain 30.0 dBi
RX power -237.8 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -97.8 dB
Path weather · HRRR average of 9 samples
Temperature
74.8 °F
23.8 °C
Dewpoint
57.4 °F
14.1 °C
T/Td gap
17.4 °F
9.7 °C
Abs. humidity
11.7
g/m³
Pressure
961.0
mb
PWAT
25.5
mm
BL depth
299.9
m AGL
Refrac. gradient
-96.1
N/km
Propagation factors · 24 GHz 63/100
Rain
100 14%
Humidity
8 13%
PWAT
60 11%
Season
47 11%
T-Td Depression
80 10%
Refractivity
62 10%
Pressure
88 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 33.6, -99.2 26.0 °C 9.1 °C 961.0 mb -42.8 281.3 25.4 mm
13% 33.5, -98.9 26.2 °C 9.1 °C 963.2 mb -53.4 281.6 23.5 mm
25% 33.4, -98.5 24.9 °C 12.1 °C 967.3 mb -86.7 325.8 23.3 mm
38% 33.4, -98.2 22.8 °C 12.6 °C 972.5 mb -52.4 309.9 27.3 mm
Midpoint 33.3, -97.9 22.9 °C 16.6 °C 972.5 mb -88.0 332.9 30.2 mm
63% 33.3, -97.6 21.8 °C 17.1 °C 977.7 mb -77.9 314.6 28.5 mm
75% 33.2, -97.3 22.0 °C 17.0 °C 984.4 mb -96.1 313.6 25.7 mm
88% 33.2, -96.9 23.5 °C 17.3 °C 990.4 mb -59.5 272.6 23.5 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 12:00 UTC · low 52 at 22:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 57 MARGINAL
09:00 62 MARGINAL
10:00 62 MARGINAL
11:00 59 MARGINAL
12:00 64 MARGINAL
13:00 60 MARGINAL
14:00 59 MARGINAL
15:00 60 MARGINAL
16:00 60 MARGINAL
17:00 62 MARGINAL
18:00 64 MARGINAL
19:00 59 MARGINAL
20:00 53 MARGINAL
21:00 53 MARGINAL
22:00 52 MARGINAL
23:00 53 MARGINAL
00:00 58 MARGINAL
01:00 · now 55 MARGINAL