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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.

33.1, -96.2 · EM13vd · 8.0 ft AGL

33.1, -96.6 · EM13qc · 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 20:00z · 9/9 path points
Distance
35.3
km · 21.9 mi
Bearing
265.5°
true · rev 85.5°
Terrain
BLOCKED
52.6 dB diffraction
Propagation
67/100
GOOD
Margin
+21.8
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 volume12 m AGL at the midpoint (37 m above the chord, 18 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 16.3 m) clears with margin. The geometric line of sight is obstructed — buried 21 m below terrain at its worst point.

Great circle
33.145, -96.238 → 33.12, -96.615 · 265.5°
Loss budget · 10 GHz
FSPL (free-space) 143.4 dB
Gaseous (O₂ + H₂O) 0.3 dB
Diffraction 52.6 dB
Rain attenuation 0.0 dB
Total path loss 196.2 dB
Gas rate 0.0071 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 7.5 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 -196.2 dB
RX antenna gain 30.0 dBi
RX power -118.2 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin 21.8 dB
Path weather · HRRR average of 9 samples
Temperature
79.9 °F
26.6 °C
Dewpoint
45.6 °F
7.6 °C
T/Td gap
34.3 °F
19.1 °C
Abs. humidity
7.5
g/m³
Pressure
994.1
mb
PWAT
14.8
mm
BL depth
2263.7
m AGL
Refrac. gradient
0
N/km
Propagation factors · 10 GHz 67/100
Rain
100 14%
Humidity
82 13%
PWAT
75 11%
Season
68 11%
T-Td Depression
55 10%
Refractivity
50 10%
Pressure
70 10%
Sky Cover
50 8%
Wind
50 8%
Time of Day
18 4%
Atmospheric profile HRRR 3 km Valid 2026-05-03 20:00 UTC · 9 samples
Point Lat, lon Temp Dewpt Press dN/dh BL m PWAT Duct
Source 33.1, -96.2 26.3 °C 7.7 °C 996.2 mb 2198.8 13.8 mm
13% 33.1, -96.3 26.3 °C 7.7 °C 996.2 mb 2198.8 13.8 mm
25% 33.1, -96.3 25.7 °C 9.1 °C 996.9 mb 2206.6 14.9 mm
38% 33.1, -96.4 25.7 °C 9.1 °C 996.9 mb 2206.6 14.9 mm
Midpoint 33.1, -96.4 25.7 °C 9.1 °C 996.9 mb 2206.6 14.9 mm
63% 33.1, -96.5 26.8 °C 8.8 °C 997.3 mb 2300.2 16.3 mm
75% 33.1, -96.5 26.8 °C 8.8 °C 997.3 mb 2300.2 16.3 mm
88% 33.1, -96.6 28.2 °C 3.9 °C 994.1 mb 2377.9 13.9 mm
Destination 33.1, -96.6 28.2 °C 3.9 °C 994.1 mb 2377.9 13.9 mm
Midpoint vertical profile
17-hour forecast · this path · 10 GHz → steady
Propagation score for this path over the next 17 hours. 0 25 50 75 100
Peak 83 at 05:00 UTC · low 72 at 22:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
20:00 73 GOOD
21:00 74 GOOD
22:00 72 GOOD
23:00 73 GOOD
00:00 75 GOOD
01:00 76 GOOD
02:00 79 GOOD
03:00 81 EXCELLENT
04:00 82 EXCELLENT
05:00 83 EXCELLENT
06:00 82 EXCELLENT
07:00 81 EXCELLENT
08:00 81 EXCELLENT
09:00 79 GOOD
10:00 80 EXCELLENT
11:00 80 EXCELLENT
12:00 · now 77 GOOD