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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.

33.3, -96.7 · EM13ph · 8.0 ft AGL

33.2, -96.5 · EM13se · 30.0 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 21:00z · 9/9 path points
Distance
31.1
km · 19.3 mi
Bearing
120.4°
true · rev 300.4°
Terrain
BLOCKED
52.5 dB diffraction
Propagation
49/100
POOR
Margin
+14.0
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 volume ≈ 10 m AGL at the midpoint (29 m above the chord, 14 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 9.9 m) clears with margin. The geometric line of sight is obstructed — buried 11 m below terrain at its worst point.

Great circle
33.331, -96.74 → 33.189, -96.452 · 120.4°
Loss budget · 24 GHz
FSPL (free-space) 149.9 dB
Gaseous (O₂ + H₂O) 1.6 dB
Diffraction 52.5 dB
Rain attenuation 0.0 dB
Total path loss 204.0 dB
Gas rate 0.0504 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 15.3 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 -204.0 dB
RX antenna gain 30.0 dBi
RX power -126.0 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin 14.0 dB
Path weather · HRRR average of 9 samples
Temperature
68.5 °F
20.3 °C
Dewpoint
64.5 °F
18.1 °C
T/Td gap
4.0 °F
2.2 °C
Abs. humidity
15.3
g/m³
Pressure
991.7
mb
PWAT
41.9
mm
BL depth
696.0
m AGL
Refrac. gradient
-58.9
N/km
Propagation factors · 24 GHz 49/100
Rain
100 14%
Humidity
0 13%
PWAT
15 11%
Season
47 11%
T-Td Depression
38 10%
Refractivity
55 10%
Pressure
70 10%
Sky Cover
50 8%
Wind
50 8%
Time of Day
18 4%
Atmospheric profile HRRR 3 km Valid 2026-05-10 21:00 UTC · 9 samples
Point Lat, lon Temp Dewpt Press dN/dh BL m PWAT Duct
Source 33.3, -96.7 21.1 °C 18.1 °C 991.7 mb -51.7 758.9 42.3 mm —
13% 33.3, -96.7 21.1 °C 18.1 °C 991.7 mb -51.7 758.9 42.3 mm —
25% 33.3, -96.7 20.0 °C 18.2 °C 995.4 mb -53.2 781.6 42.2 mm —
38% 33.3, -96.6 20.0 °C 18.2 °C 995.4 mb -53.2 781.6 42.2 mm —
Midpoint 33.3, -96.6 20.0 °C 18.2 °C 995.4 mb -53.2 781.6 42.2 mm —
63% 33.2, -96.6 20.1 °C 17.9 °C 997.2 mb -58.9 600.2 41.5 mm —
75% 33.2, -96.5 20.1 °C 17.9 °C 997.2 mb -58.9 600.2 41.5 mm —
88% 33.2, -96.5 20.1 °C 17.9 °C 997.2 mb -58.9 600.2 41.5 mm —
Destination 33.2, -96.5 20.1 °C 17.9 °C 997.2 mb -58.9 600.2 41.5 mm —
Midpoint vertical profile
17-hour forecast · this path · 24 GHz → steady
Propagation score for this path over the next 17 hours. 0 25 50 75 100
Peak 61 at 12:00 UTC · low 32 at 22:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
21:00 42 POOR
22:00 32 NEGLIGIBLE
23:00 45 POOR
00:00 47 POOR
01:00 47 POOR
02:00 39 POOR
03:00 44 POOR
04:00 55 MARGINAL
05:00 54 MARGINAL
06:00 56 MARGINAL
07:00 55 MARGINAL
08:00 55 MARGINAL
09:00 54 MARGINAL
10:00 60 MARGINAL
11:00 60 MARGINAL
12:00 61 MARGINAL
13:00 · now 61 MARGINAL