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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, -99.0 · EM03mg · 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
221.9
km · 137.9 mi
Bearing
94.0°
true · rev 274.0°
Terrain
BLOCKED
134.8 dB diffraction
Propagation
63/100
MARGINAL
Margin
-93.8
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 volume483 m AGL at the midpoint (1449 m above the chord, 725 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 26.3 m) clears with margin. The geometric line of sight is obstructed — buried 747 m below terrain at its worst point.

Great circle
33.282, -98.993 → 33.12, -96.615 · 94.0°
Loss budget · 24 GHz
FSPL (free-space) 167.0 dB
Gaseous (O₂ + H₂O) 10.0 dB
Diffraction 134.8 dB
Rain attenuation 0.0 dB
Total path loss 311.8 dB
Gas rate 0.0449 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 12.4 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 -311.8 dB
RX antenna gain 30.0 dBi
RX power -233.8 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -93.8 dB
Path weather · HRRR average of 9 samples
Temperature
74.1 °F
23.4 °C
Dewpoint
59.0 °F
15.0 °C
T/Td gap
15.1 °F
8.4 °C
Abs. humidity
12.4
g/m³
Pressure
964.3
mb
PWAT
26.2
mm
BL depth
290.5
m AGL
Refrac. gradient
-92.6
N/km
Propagation factors · 24 GHz 63/100
Rain
100 14%
Humidity
6 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, -99.0 25.0 °C 13.6 °C 966.3 mb -80.9 301.6 26.9 mm
13% 33.3, -98.7 25.3 °C 13.0 °C 965.5 mb -92.6 310.5 27.0 mm
25% 33.2, -98.4 23.7 °C 12.5 °C 964.3 mb -66.3 326.6 25.8 mm
38% 33.2, -98.1 22.8 °C 14.0 °C 973.5 mb -70.3 259.2 29.0 mm
Midpoint 33.2, -97.8 22.4 °C 17.0 °C 979.0 mb -73.2 342.1 30.2 mm
63% 33.2, -97.5 22.2 °C 16.9 °C 976.3 mb -89.7 269.4 27.0 mm
75% 33.2, -97.2 21.3 °C 16.7 °C 983.4 mb -85.7 259.1 24.9 mm
88% 33.1, -96.9 23.5 °C 15.0 °C 988.3 mb -69.0 279.1 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 65 at 18:00 UTC · low 53 at 23:00 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 60 MARGINAL
11:00 59 MARGINAL
12:00 61 MARGINAL
13:00 61 MARGINAL
14:00 60 MARGINAL
15:00 59 MARGINAL
16:00 60 MARGINAL
17:00 64 MARGINAL
18:00 65 GOOD
19:00 62 MARGINAL
20:00 55 MARGINAL
21:00 55 MARGINAL
22:00 54 MARGINAL
23:00 53 MARGINAL
00:00 55 MARGINAL
01:00 · now 56 MARGINAL