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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.

34.0, -95.6 · EM24ea · 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
137.5
km · 85.4 mi
Bearing
222.2°
true · rev 42.2°
Terrain
BLOCKED
115.8 dB diffraction
Propagation
62/100
MARGINAL
Margin
-67.4
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 volume185 m AGL at the midpoint (556 m above the chord, 278 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 20.7 m) clears with margin. The geometric line of sight is obstructed — buried 277 m below terrain at its worst point.

Great circle
34.041, -95.625 → 33.12, -96.615 · 222.2°
Loss budget · 24 GHz
FSPL (free-space) 162.8 dB
Gaseous (O₂ + H₂O) 6.8 dB
Diffraction 115.8 dB
Rain attenuation 0.0 dB
Total path loss 285.4 dB
Gas rate 0.0492 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 14.6 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 -285.4 dB
RX antenna gain 30.0 dBi
RX power -207.4 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -67.4 dB
Path weather · HRRR average of 9 samples
Temperature
71.5 °F
21.9 °C
Dewpoint
63.3 °F
17.4 °C
T/Td gap
8.1 °F
4.5 °C
Abs. humidity
14.6
g/m³
Pressure
986.2
mb
PWAT
23.5
mm
BL depth
253.2
m AGL
Refrac. gradient
-147.4
N/km · super-refractive
Propagation factors · 24 GHz 62/100
Rain
100 14%
Humidity
0 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 34.0, -95.6 21.0 °C 17.8 °C 990.7 mb -128.9 288.6 25.7 mm
13% 33.9, -95.7 20.5 °C 18.2 °C 994.5 mb -147.4 227.5 26.9 mm
25% 33.8, -95.9 21.4 °C 17.3 °C 990.1 mb -102.0 256.3 23.9 mm
38% 33.7, -96.0 21.4 °C 17.6 °C 990.7 mb -86.4 253.3 23.5 mm
Midpoint 33.6, -96.1 21.4 °C 18.0 °C 990.2 mb -100.8 244.3 22.9 mm
63% 33.5, -96.2 22.1 °C 17.6 °C 986.2 mb -125.9 254.9 22.4 mm
75% 33.4, -96.4 22.6 °C 17.1 °C 986.2 mb -122.6 250.2 22.0 mm
88% 33.2, -96.5 22.9 °C 17.0 °C 988.8 mb -123.5 237.3 21.9 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 64 at 21:00 UTC · low 56 at 17:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 63 MARGINAL
09:00 59 MARGINAL
10:00 61 MARGINAL
11:00 61 MARGINAL
12:00 62 MARGINAL
13:00 58 MARGINAL
14:00 62 MARGINAL
15:00 61 MARGINAL
16:00 58 MARGINAL
17:00 56 MARGINAL
18:00 59 MARGINAL
19:00 58 MARGINAL
20:00 62 MARGINAL
21:00 64 MARGINAL
22:00 58 MARGINAL
23:00 60 MARGINAL
00:00 59 MARGINAL
01:00 · now 59 MARGINAL