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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.

33.7, -97.2 · EM13kq · 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
80.5
km · 50.0 mi
Bearing
141.1°
true · rev 321.1°
Terrain
BLOCKED
92.2 dB diffraction
Propagation
61/100
MARGINAL
Margin
-36.1
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 volume64 m AGL at the midpoint (191 m above the chord, 95 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 15.9 m) clears with margin. The geometric line of sight is obstructed — buried 86 m below terrain at its worst point.

Great circle
33.684, -97.159 → 33.12, -96.615 · 141.1°
Loss budget · 24 GHz
FSPL (free-space) 158.2 dB
Gaseous (O₂ + H₂O) 3.8 dB
Diffraction 92.2 dB
Rain attenuation 0.0 dB
Total path loss 254.1 dB
Gas rate 0.0466 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 13.3 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 -254.1 dB
RX antenna gain 30.0 dBi
RX power -176.1 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -36.1 dB
Path weather · HRRR average of 9 samples
Temperature
74.2 °F
23.4 °C
Dewpoint
60.8 °F
16.0 °C
T/Td gap
13.3 °F
7.4 °C
Abs. humidity
13.3
g/m³
Pressure
981.9
mb
PWAT
24.4
mm
BL depth
321.8
m AGL
Refrac. gradient
-91.6
N/km
Propagation factors · 24 GHz 61/100
Rain
100 14%
Humidity
3 13%
PWAT
60 11%
Season
47 11%
T-Td Depression
60 10%
Refractivity
62 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 33.7, -97.2 22.5 °C 17.3 °C 981.9 mb -80.8 348.1 27.9 mm
13% 33.6, -97.1 22.5 °C 17.3 °C 981.9 mb -80.8 348.1 27.9 mm
25% 33.5, -97.0 23.2 °C 16.3 °C 984.6 mb -83.7 351.7 25.5 mm
38% 33.5, -97.0 23.2 °C 16.3 °C 984.6 mb -83.7 351.7 25.5 mm
Midpoint 33.4, -96.9 23.7 °C 15.3 °C 986.5 mb -81.8 339.3 23.5 mm
63% 33.3, -96.8 23.7 °C 15.3 °C 986.5 mb -81.8 339.3 23.5 mm
75% 33.3, -96.8 24.1 °C 14.8 °C 985.1 mb -64.2 282.1 21.9 mm
88% 33.2, -96.7 23.7 °C 15.6 °C 987.5 mb -91.6 269.3 22.0 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 08:00 UTC · low 50 at 01:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 65 GOOD
09:00 60 MARGINAL
10:00 62 MARGINAL
11:00 58 MARGINAL
12:00 60 MARGINAL
13:00 60 MARGINAL
14:00 60 MARGINAL
15:00 58 MARGINAL
16:00 60 MARGINAL
17:00 61 MARGINAL
18:00 63 MARGINAL
19:00 62 MARGINAL
20:00 64 MARGINAL
21:00 59 MARGINAL
22:00 58 MARGINAL
23:00 57 MARGINAL
00:00 53 MARGINAL
01:00 · now 50 MARGINAL