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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.

33.4, -96.4 · EM13ti · 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
34.1
km · 21.2 mi
Bearing
215.9°
true · rev 35.9°
Terrain
BLOCKED
19.0 dB diffraction
Propagation
79/100
GOOD
Margin
+55.6
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 volume11 m AGL at the midpoint (34 m above the chord, 17 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 16.0 m) clears with margin. The geometric line of sight is obstructed — buried 1 m below terrain at its worst point.

Great circle
33.369, -96.401 → 33.12, -96.615 · 215.9°
Loss budget · 10 GHz
FSPL (free-space) 143.1 dB
Gaseous (O₂ + H₂O) 0.2 dB
Diffraction 19.0 dB
Rain attenuation 0.0 dB
Total path loss 162.4 dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 14.1 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 -162.4 dB
RX antenna gain 30.0 dBi
RX power -84.4 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin 55.6 dB
Path weather · HRRR average of 9 samples
Temperature
73.5 °F
23.0 °C
Dewpoint
62.4 °F
16.9 °C
T/Td gap
11.1 °F
6.2 °C
Abs. humidity
14.1
g/m³
Pressure
986.2
mb
PWAT
22.0
mm
BL depth
245.8
m AGL
Refrac. gradient
-123.5
N/km · super-refractive
Propagation factors · 10 GHz 79/100
Rain
100 14%
Humidity
95 13%
PWAT
90 11%
Season
68 11%
T-Td Depression
85 10%
Refractivity
82 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 33.4, -96.4 22.6 °C 17.1 °C 986.2 mb -122.6 250.2 22.0 mm
13% 33.3, -96.4 22.6 °C 17.1 °C 986.2 mb -122.6 250.2 22.0 mm
25% 33.3, -96.5 22.9 °C 17.0 °C 988.8 mb -123.5 237.3 21.9 mm
38% 33.3, -96.5 22.9 °C 17.0 °C 988.8 mb -123.5 237.3 21.9 mm
Midpoint 33.2, -96.5 22.9 °C 17.0 °C 988.8 mb -123.5 237.3 21.9 mm
63% 33.2, -96.5 22.9 °C 17.0 °C 988.8 mb -123.5 237.3 21.9 mm
75% 33.2, -96.6 22.2 °C 17.6 °C 991.0 mb -120.9 229.6 22.7 mm
88% 33.2, -96.6 24.1 °C 16.0 °C 987.4 mb -91.5 266.6 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 · 10 GHz → steady
Propagation score for this path over the next 18 hours. 0 25 50 75 100
Peak 85 at 08:00 UTC · low 70 at 22:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 85 EXCELLENT
09:00 85 EXCELLENT
10:00 79 GOOD
11:00 78 GOOD
12:00 77 GOOD
13:00 78 GOOD
14:00 79 GOOD
15:00 77 GOOD
16:00 73 GOOD
17:00 75 GOOD
18:00 81 EXCELLENT
19:00 74 GOOD
20:00 80 EXCELLENT
21:00 79 GOOD
22:00 70 GOOD
23:00 71 GOOD
00:00 72 GOOD
01:00 · now 73 GOOD