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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.

32.7, -97.3 · EM12ir · 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
79.3
km · 49.3 mi
Bearing
56.4°
true · rev 236.4°
Terrain
BLOCKED
94.3 dB diffraction
Propagation
62/100
MARGINAL
Margin
-37.9
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 volume62 m AGL at the midpoint (185 m above the chord, 93 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 15.7 m) clears with margin. The geometric line of sight is obstructed — buried 84 m below terrain at its worst point.

Great circle
32.727, -97.325 → 33.12, -96.615 · 56.4°
Loss budget · 24 GHz
FSPL (free-space) 158.0 dB
Gaseous (O₂ + H₂O) 3.6 dB
Diffraction 94.3 dB
Rain attenuation 0.0 dB
Total path loss 255.9 dB
Gas rate 0.0451 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 12.5 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 -255.9 dB
RX antenna gain 30.0 dBi
RX power -177.9 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -37.9 dB
Path weather · HRRR average of 9 samples
Temperature
74.6 °F
23.6 °C
Dewpoint
59.2 °F
15.1 °C
T/Td gap
15.4 °F
8.5 °C
Abs. humidity
12.5
g/m³
Pressure
985.3
mb
PWAT
23.3
mm
BL depth
281.9
m AGL
Refrac. gradient
-91.5
N/km
Propagation factors · 24 GHz 62/100
Rain
100 14%
Humidity
6 13%
PWAT
60 11%
Season
47 11%
T-Td Depression
80 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 32.7, -97.3 23.0 °C 15.1 °C 989.3 mb -70.3 263.9 24.8 mm
13% 32.8, -97.2 23.5 °C 14.1 °C 989.0 mb -68.4 267.3 23.9 mm
25% 32.8, -97.1 23.4 °C 14.6 °C 988.9 mb -58.5 292.7 23.8 mm
38% 32.9, -97.1 23.9 °C 15.0 °C 990.9 mb -68.1 289.9 23.7 mm
Midpoint 32.9, -97.0 23.9 °C 15.0 °C 990.9 mb -68.1 289.9 23.7 mm
63% 33.0, -96.9 23.0 °C 15.6 °C 988.3 mb -85.3 272.4 23.2 mm
75% 33.0, -96.8 24.5 °C 15.6 °C 986.8 mb -81.7 310.9 22.9 mm
88% 33.1, -96.7 23.6 °C 14.9 °C 985.3 mb -68.1 283.7 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 17:00 UTC · low 57 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 61 MARGINAL
11:00 60 MARGINAL
12:00 61 MARGINAL
13:00 62 MARGINAL
14:00 62 MARGINAL
15:00 61 MARGINAL
16:00 60 MARGINAL
17:00 65 GOOD
18:00 64 MARGINAL
19:00 63 MARGINAL
20:00 64 MARGINAL
21:00 63 MARGINAL
22:00 58 MARGINAL
23:00 58 MARGINAL
00:00 57 MARGINAL
01:00 · now 58 MARGINAL