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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.

34.1, -96.7 · EM14pb · 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
104.0
km · 64.6 mi
Bearing
174.1°
true · rev 354.1°
Terrain
BLOCKED
108.6 dB diffraction
Propagation
62/100
MARGINAL
Margin
-55.9
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 volume106 m AGL at the midpoint (318 m above the chord, 159 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 18.0 m) clears with margin. The geometric line of sight is obstructed — buried 192 m below terrain at its worst point.

Great circle
34.05, -96.73 → 33.12, -96.615 · 174.1°
Loss budget · 24 GHz
FSPL (free-space) 160.4 dB
Gaseous (O₂ + H₂O) 5.0 dB
Diffraction 108.6 dB
Rain attenuation 0.0 dB
Total path loss 273.9 dB
Gas rate 0.0477 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 13.9 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 -273.9 dB
RX antenna gain 30.0 dBi
RX power -195.9 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -55.9 dB
Path weather · HRRR average of 9 samples
Temperature
74.3 °F
23.5 °C
Dewpoint
62.0 °F
16.7 °C
T/Td gap
12.3 °F
6.8 °C
Abs. humidity
13.9
g/m³
Pressure
980.1
mb
PWAT
24.5
mm
BL depth
314.7
m AGL
Refrac. gradient
-119.7
N/km · super-refractive
Propagation factors · 24 GHz 62/100
Rain
100 14%
Humidity
2 13%
PWAT
60 11%
Season
47 11%
T-Td Depression
60 10%
Refractivity
72 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 34.1, -96.7 23.3 °C 17.8 °C 980.3 mb -74.0 359.8 28.0 mm
13% 33.9, -96.7 23.3 °C 17.6 °C 982.2 mb -83.9 348.3 27.4 mm
25% 33.8, -96.7 23.3 °C 17.6 °C 982.2 mb -83.9 348.3 27.4 mm
38% 33.7, -96.7 22.5 °C 16.8 °C 980.1 mb -73.5 302.5 24.7 mm
Midpoint 33.6, -96.7 23.5 °C 16.5 °C 983.2 mb -87.4 311.8 23.7 mm
63% 33.5, -96.7 23.7 °C 16.1 °C 980.6 mb -119.7 317.8 22.8 mm
75% 33.4, -96.6 23.9 °C 15.8 °C 986.1 mb -102.5 307.6 22.3 mm
88% 33.2, -96.6 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 63 at 10:00 UTC · low 53 at 01:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 61 MARGINAL
09:00 61 MARGINAL
10:00 63 MARGINAL
11:00 62 MARGINAL
12:00 60 MARGINAL
13:00 60 MARGINAL
14:00 61 MARGINAL
15:00 59 MARGINAL
16:00 56 MARGINAL
17:00 60 MARGINAL
18:00 61 MARGINAL
19:00 61 MARGINAL
20:00 63 MARGINAL
21:00 60 MARGINAL
22:00 59 MARGINAL
23:00 57 MARGINAL
00:00 54 MARGINAL
01:00 · now 53 MARGINAL