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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, -96.2 · EM13vd · 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
22.1
km · 13.7 mi
Bearing
278.3°
true · rev 98.3°
Terrain
BLOCKED
75.5 dB diffraction
Propagation
51/100
MARGINAL
Margin
-5.5
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 ≈ 5 m AGL at the midpoint (14 m above the chord, 7 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 8.3 m) clears with margin. The geometric line of sight is obstructed — buried 26 m below terrain at its worst point.

Great circle
33.16, -96.216 → 33.189, -96.452 · 278.3°
Loss budget · 24 GHz
FSPL (free-space) 146.9 dB
Gaseous (O₂ + H₂O) 1.1 dB
Diffraction 75.5 dB
Rain attenuation 0.0 dB
Total path loss 223.5 dB
Gas rate 0.0497 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 14.9 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 -223.5 dB
RX antenna gain 30.0 dBi
RX power -145.5 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -5.5 dB
Path weather · HRRR average of 9 samples
Temperature
65.9 °F
18.8 °C
Dewpoint
63.7 °F
17.6 °C
T/Td gap
2.2 °F
1.2 °C
Abs. humidity
14.9
g/m³
Pressure
996.8
mb
PWAT
39.7
mm
BL depth
431.8
m AGL
Refrac. gradient
-69.8
N/km
Propagation factors · 24 GHz 51/100
Rain
100 14%
Humidity
0 13%
PWAT
35 11%
Season
47 11%
T-Td Depression
18 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 33.2, -96.2 18.4 °C 17.4 °C 996.8 mb -69.8 348.7 39.6 mm —
13% 33.2, -96.2 18.4 °C 17.4 °C 996.8 mb -69.8 348.7 39.6 mm —
25% 33.2, -96.3 18.4 °C 17.4 °C 996.8 mb -69.8 348.7 39.6 mm —
38% 33.2, -96.3 18.4 °C 17.4 °C 996.8 mb -69.8 348.7 39.6 mm —
Midpoint 33.2, -96.3 18.9 °C 17.7 °C 997.6 mb -63.8 472.8 39.3 mm —
63% 33.2, -96.4 18.9 °C 17.7 °C 997.6 mb -63.8 472.8 39.3 mm —
75% 33.2, -96.4 18.9 °C 17.7 °C 997.6 mb -63.8 472.8 39.3 mm —
88% 33.2, -96.4 18.9 °C 17.7 °C 997.6 mb -63.8 472.8 39.3 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 59 at 12:00 UTC · low 35 at 21:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
21:00 35 POOR
22:00 47 POOR
23:00 49 POOR
00:00 47 POOR
01:00 47 POOR
02:00 47 POOR
03:00 37 POOR
04:00 54 MARGINAL
05:00 54 MARGINAL
06:00 55 MARGINAL
07:00 53 MARGINAL
08:00 53 MARGINAL
09:00 53 MARGINAL
10:00 55 MARGINAL
11:00 55 MARGINAL
12:00 59 MARGINAL
13:00 · now 59 MARGINAL