Skip to content
NTMS Propagation Path calculator

Path Calculator

Point-to-point prediction over HRRR profiles, SRTM terrain and ITU-R P.676 / P.530.

32.2, -97.9 · EM12be · 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
159.7
km · 99.3 mi
Bearing
48.2°
true · rev 228.2°
Terrain
BLOCKED
116.4 dB diffraction
Propagation
63/100
MARGINAL
Margin
-69.8
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 volume250 m AGL at the midpoint (751 m above the chord, 375 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 22.3 m) clears with margin. The geometric line of sight is obstructed — buried 313 m below terrain at its worst point.

Great circle
32.17, -97.895 → 33.12, -96.615 · 48.2°
Loss budget · 24 GHz
FSPL (free-space) 164.1 dB
Gaseous (O₂ + H₂O) 7.3 dB
Diffraction 116.4 dB
Rain attenuation 0.0 dB
Total path loss 287.8 dB
Gas rate 0.0456 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 12.8 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 -287.8 dB
RX antenna gain 30.0 dBi
RX power -209.8 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -69.8 dB
Path weather · HRRR average of 9 samples
Temperature
73.0 °F
22.8 °C
Dewpoint
59.7 °F
15.4 °C
T/Td gap
13.3 °F
7.4 °C
Abs. humidity
12.8
g/m³
Pressure
972.4
mb
PWAT
23.5
mm
BL depth
239.4
m AGL
Refrac. gradient
-114.9
N/km · super-refractive
Propagation factors · 24 GHz 63/100
Rain
100 14%
Humidity
5 13%
PWAT
60 11%
Season
47 11%
T-Td Depression
60 10%
Refractivity
72 10%
Pressure
88 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 32.2, -97.9 20.1 °C 15.5 °C 972.4 mb -77.7 120.3 23.4 mm
13% 32.3, -97.7 21.9 °C 16.2 °C 985.0 mb -91.3 175.1 24.4 mm
25% 32.4, -97.6 23.0 °C 14.9 °C 983.0 mb -88.4 237.1 24.0 mm
38% 32.5, -97.4 22.7 °C 14.0 °C 981.0 mb -114.9 236.1 23.3 mm
Midpoint 32.6, -97.3 21.4 °C 15.3 °C 988.0 mb -98.7 204.5 23.7 mm
63% 32.8, -97.1 23.6 °C 14.8 °C 989.2 mb -76.8 268.6 23.5 mm
75% 32.9, -96.9 23.7 °C 16.1 °C 993.0 mb -80.7 335.5 24.5 mm
88% 33.0, -96.8 24.5 °C 15.6 °C 986.8 mb -81.7 310.9 22.9 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 63 at 17:00 UTC · low 55 at 01:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 60 MARGINAL
09:00 62 MARGINAL
10:00 60 MARGINAL
11:00 60 MARGINAL
12:00 61 MARGINAL
13:00 61 MARGINAL
14:00 61 MARGINAL
15:00 61 MARGINAL
16:00 61 MARGINAL
17:00 63 MARGINAL
18:00 60 MARGINAL
19:00 62 MARGINAL
20:00 60 MARGINAL
21:00 63 MARGINAL
22:00 58 MARGINAL
23:00 58 MARGINAL
00:00 58 MARGINAL
01:00 · now 55 MARGINAL