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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.

33.2, -96.4 · EM13td · 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
21.3
km · 13.2 mi
Bearing
258.6°
true · rev 78.6°
Terrain
CLEAR
0.0 dB diffraction
Propagation
79/100
GOOD
Margin
+78.8
dB over CW threshold
Terrain profile · SRTM 30 m + canopy + MS footprints
Line of sight 1st Fresnel Duct layer
Great circle
33.158, -96.391 → 33.12, -96.615 · 258.6°
Loss budget · 10 GHz
FSPL (free-space) 139.0 dB
Gaseous (O₂ + H₂O) 0.2 dB
Rain attenuation 0.0 dB
Total path loss 139.2 dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 14.5 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 -139.2 dB
RX antenna gain 30.0 dBi
RX power -61.2 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin 78.8 dB
Path weather · HRRR average of 9 samples
Temperature
72.2 °F
22.3 °C
Dewpoint
63.2 °F
17.3 °C
T/Td gap
9.1 °F
5.0 °C
Abs. humidity
14.5
g/m³
Pressure
987.4
mb
PWAT
22.3
mm
BL depth
234.9
m AGL
Refrac. gradient
-120.9
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 33.2, -96.4 21.0 °C 17.9 °C 990.6 mb -119.7 216.4 21.5 mm —
13% 33.2, -96.4 21.0 °C 17.9 °C 990.6 mb -119.7 216.4 21.5 mm —
25% 33.1, -96.4 22.2 °C 17.6 °C 991.0 mb -120.9 229.6 22.7 mm —
38% 33.1, -96.5 22.2 °C 17.6 °C 991.0 mb -120.9 229.6 22.7 mm —
Midpoint 33.1, -96.5 22.2 °C 17.6 °C 991.0 mb -120.9 229.6 22.7 mm —
63% 33.1, -96.5 22.2 °C 17.6 °C 991.0 mb -120.9 229.6 22.7 mm —
75% 33.1, -96.6 22.2 °C 17.6 °C 991.0 mb -120.9 229.6 22.7 mm —
88% 33.1, -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 72 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 80 EXCELLENT
10:00 79 GOOD
11:00 78 GOOD
12:00 77 GOOD
13:00 77 GOOD
14:00 78 GOOD
15:00 76 GOOD
16:00 76 GOOD
17:00 74 GOOD
18:00 77 GOOD
19:00 78 GOOD
20:00 80 EXCELLENT
21:00 77 GOOD
22:00 72 GOOD
23:00 73 GOOD
00:00 74 GOOD
01:00 · now 74 GOOD