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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.

33.2, -98.4 · EM03tf · 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
164.4
km · 102.2 mi
Bearing
93.0°
true · rev 273.0°
Terrain
BLOCKED
119.6 dB diffraction
Propagation
62/100
MARGINAL
Margin
-73.5
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 volume265 m AGL at the midpoint (796 m above the chord, 398 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 22.7 m) clears with margin. The geometric line of sight is obstructed — buried 360 m below terrain at its worst point.

Great circle
33.209, -98.379 → 33.12, -96.615 · 93.0°
Loss budget · 24 GHz
FSPL (free-space) 164.4 dB
Gaseous (O₂ + H₂O) 7.5 dB
Diffraction 119.6 dB
Rain attenuation 0.0 dB
Total path loss 291.5 dB
Gas rate 0.0457 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 12.8 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 -291.5 dB
RX antenna gain 30.0 dBi
RX power -213.5 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -73.5 dB
Path weather · HRRR average of 9 samples
Temperature
73.5 °F
23.1 °C
Dewpoint
59.7 °F
15.4 °C
T/Td gap
13.8 °F
7.6 °C
Abs. humidity
12.8
g/m³
Pressure
964.3
mb
PWAT
25.9
mm
BL depth
280.8
m AGL
Refrac. gradient
-94.3
N/km
Propagation factors · 24 GHz 62/100
Rain
100 14%
Humidity
5 13%
PWAT
60 11%
Season
47 11%
T-Td Depression
60 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 33.2, -98.4 23.7 °C 12.5 °C 964.3 mb -66.3 326.6 25.8 mm
13% 33.2, -98.2 22.8 °C 14.0 °C 973.5 mb -70.3 259.2 29.0 mm
25% 33.2, -97.9 23.0 °C 14.6 °C 973.0 mb -94.3 257.1 29.2 mm
38% 33.2, -97.7 23.5 °C 15.7 °C 979.2 mb -71.1 337.1 29.2 mm
Midpoint 33.2, -97.5 22.2 °C 16.9 °C 976.3 mb -89.7 269.4 27.0 mm
63% 33.2, -97.3 21.3 °C 16.7 °C 983.4 mb -85.7 259.1 24.9 mm
75% 33.1, -97.1 23.5 °C 17.3 °C 990.4 mb -59.5 272.6 23.5 mm
88% 33.1, -96.8 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 66 at 15:00 UTC · low 53 at 00:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 59 MARGINAL
09:00 61 MARGINAL
10:00 62 MARGINAL
11:00 61 MARGINAL
12:00 60 MARGINAL
13:00 60 MARGINAL
14:00 60 MARGINAL
15:00 66 GOOD
16:00 61 MARGINAL
17:00 60 MARGINAL
18:00 64 MARGINAL
19:00 64 MARGINAL
20:00 64 MARGINAL
21:00 59 MARGINAL
22:00 55 MARGINAL
23:00 55 MARGINAL
00:00 53 MARGINAL
01:00 · now 55 MARGINAL