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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, -99.2 · EM03ji · 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
241.7
km · 150.2 mi
Bearing
94.9°
true · rev 274.9°
Terrain
BLOCKED
136.9 dB diffraction
Propagation
63/100
MARGINAL
Margin
-97.4
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 volume573 m AGL at the midpoint (1719 m above the chord, 859 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 27.5 m) clears with margin. The geometric line of sight is obstructed — buried 853 m below terrain at its worst point.

Great circle
33.333, -99.201 → 33.12, -96.615 · 94.9°
Loss budget · 24 GHz
FSPL (free-space) 167.7 dB
Gaseous (O₂ + H₂O) 10.8 dB
Diffraction 136.9 dB
Rain attenuation 0.0 dB
Total path loss 315.4 dB
Gas rate 0.0446 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 12.3 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 -315.4 dB
RX antenna gain 30.0 dBi
RX power -237.4 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -97.4 dB
Path weather · HRRR average of 9 samples
Temperature
74.3 °F
23.5 °C
Dewpoint
58.7 °F
14.8 °C
T/Td gap
15.5 °F
8.6 °C
Abs. humidity
12.3
g/m³
Pressure
956.9
mb
PWAT
26.4
mm
BL depth
288.6
m AGL
Refrac. gradient
-91.5
N/km
Propagation factors · 24 GHz 63/100
Rain
100 14%
Humidity
7 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 33.3, -99.2 25.0 °C 11.2 °C 956.9 mb -58.3 161.1 26.2 mm
13% 33.3, -98.9 25.7 °C 12.8 °C 965.8 mb -82.4 304.7 27.7 mm
25% 33.3, -98.6 23.6 °C 12.8 °C 963.4 mb -66.3 350.6 26.4 mm
38% 33.3, -98.2 23.4 °C 12.9 °C 970.4 mb -54.0 316.6 27.5 mm
Midpoint 33.2, -97.9 22.9 °C 16.6 °C 978.8 mb -83.6 351.3 30.5 mm
63% 33.2, -97.6 21.8 °C 17.1 °C 977.7 mb -77.9 314.6 28.5 mm
75% 33.2, -97.3 21.3 °C 16.7 °C 983.4 mb -85.7 259.1 24.9 mm
88% 33.1, -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 66 at 17:00 UTC · low 49 at 00:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 58 MARGINAL
09:00 61 MARGINAL
10:00 60 MARGINAL
11:00 62 MARGINAL
12:00 62 MARGINAL
13:00 62 MARGINAL
14:00 62 MARGINAL
15:00 60 MARGINAL
16:00 59 MARGINAL
17:00 66 GOOD
18:00 65 GOOD
19:00 59 MARGINAL
20:00 56 MARGINAL
21:00 56 MARGINAL
22:00 54 MARGINAL
23:00 55 MARGINAL
00:00 49 POOR
01:00 · now 54 MARGINAL