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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.

33.5, -96.6 · EM13ql · 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
39.4
km · 24.5 mi
Bearing
178.4°
true · rev 358.4°
Terrain
FRESNEL_MINOR
3.0 dB diffraction
Propagation
63/100
MARGINAL
Margin
+61.2
dB over CW threshold
Terrain profile · SRTM 30 m + canopy + MS footprints
Line of sight 1st Fresnel Duct layer
Great circle
33.474, -96.627 → 33.12, -96.615 · 178.4°
Loss budget · 24 GHz
FSPL (free-space) 151.9 dB
Gaseous (O₂ + H₂O) 1.8 dB
Diffraction 3.0 dB
Rain attenuation 0.0 dB
Total path loss 156.8 dB
Gas rate 0.0462 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 13.1 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 -156.8 dB
RX antenna gain 30.0 dBi
RX power -78.8 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin 61.2 dB
Path weather · HRRR average of 9 samples
Temperature
74.9 °F
23.8 °C
Dewpoint
60.5 °F
15.8 °C
T/Td gap
14.5 °F
8.0 °C
Abs. humidity
13.1
g/m³
Pressure
980.6
mb
PWAT
22.2
mm
BL depth
286.8
m AGL
Refrac. gradient
-119.7
N/km · super-refractive
Propagation factors · 24 GHz 63/100
Rain
100 14%
Humidity
4 13%
PWAT
60 11%
Season
47 11%
T-Td Depression
80 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 33.5, -96.6 23.7 °C 16.1 °C 980.6 mb -119.7 317.8 22.8 mm
13% 33.4, -96.6 23.9 °C 15.8 °C 986.1 mb -102.5 307.6 22.3 mm
25% 33.4, -96.6 23.9 °C 15.8 °C 986.1 mb -102.5 307.6 22.3 mm
38% 33.3, -96.6 23.9 °C 15.8 °C 986.1 mb -102.5 307.6 22.3 mm
Midpoint 33.3, -96.6 23.7 °C 15.6 °C 987.5 mb -91.6 269.3 22.0 mm
63% 33.3, -96.6 23.7 °C 15.6 °C 987.5 mb -91.6 269.3 22.0 mm
75% 33.2, -96.6 23.7 °C 15.6 °C 987.5 mb -91.6 269.3 22.0 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 · 24 GHz → steady
Propagation score for this path over the next 18 hours. 0 25 50 75 100
Peak 66 at 10:00 UTC · low 57 at 01:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 65 GOOD
09:00 62 MARGINAL
10:00 66 GOOD
11:00 62 MARGINAL
12:00 63 MARGINAL
13:00 63 MARGINAL
14:00 63 MARGINAL
15:00 63 MARGINAL
16:00 62 MARGINAL
17:00 62 MARGINAL
18:00 63 MARGINAL
19:00 61 MARGINAL
20:00 64 MARGINAL
21:00 63 MARGINAL
22:00 59 MARGINAL
23:00 59 MARGINAL
00:00 59 MARGINAL
01:00 · now 57 MARGINAL