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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.

33.6, -99.2 · EM03jn · 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
244.2
km · 151.7 mi
Bearing
100.6°
true · rev 280.6°
Terrain
BLOCKED
146.3 dB diffraction
Propagation
73/100
GOOD
Margin
-116.8
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 volume585 m AGL at the midpoint (1755 m above the chord, 877 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 19.7 m) clears with margin. The geometric line of sight is obstructed — buried 874 m below terrain at its worst point.

Great circle
33.55, -99.193 → 33.12, -96.615 · 100.6°
Loss budget · 47 GHz
FSPL (free-space) 173.6 dB
Gaseous (O₂ + H₂O) 14.8 dB
Diffraction 146.3 dB
Rain attenuation 0.0 dB
Total path loss 334.8 dB
Gas rate 0.0607 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 6.9 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 -334.8 dB
RX antenna gain 30.0 dBi
RX power -256.8 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -116.8 dB
Path weather · HRRR average of 9 samples
Temperature
80.1 °F
26.7 °C
Dewpoint
43.2 °F
6.2 °C
T/Td gap
36.9 °F
20.5 °C
Abs. humidity
6.9
g/m³
Pressure
970.0
mb
PWAT
13.3
mm
BL depth
2288.3
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz 73/100
Rain
100 14%
Humidity
89 13%
PWAT
80 11%
Season
55 11%
T-Td Depression
96 10%
Refractivity
50 10%
Pressure
88 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 33.6, -99.2 27.0 °C 5.0 °C 970.0 mb 2322.1 12.9 mm
13% 33.5, -98.9 26.8 °C 5.7 °C 972.8 mb 2266.1 12.8 mm
25% 33.4, -98.5 27.8 °C 4.5 °C 975.5 mb 2275.3 12.8 mm
38% 33.4, -98.2 27.4 °C 5.3 °C 980.1 mb 2299.4 12.8 mm
Midpoint 33.3, -97.9 26.5 °C 5.2 °C 979.8 mb 2261.7 11.8 mm
63% 33.3, -97.6 26.1 °C 6.5 °C 985.1 mb 2315.1 12.9 mm
75% 33.2, -97.3 26.2 °C 9.6 °C 992.0 mb 2131.5 14.8 mm
88% 33.2, -96.9 24.4 °C 10.4 °C 997.5 mb 2345.3 15.1 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 · 47 GHz → steady
Propagation score for this path over the next 17 hours. 0 25 50 75 100
Peak 81 at 03:00 UTC · low 66 at 12:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
20:00 80 EXCELLENT
21:00 80 EXCELLENT
22:00 79 GOOD
23:00 79 GOOD
00:00 80 EXCELLENT
01:00 76 GOOD
02:00 72 GOOD
03:00 81 EXCELLENT
04:00 79 GOOD
05:00 79 GOOD
06:00 79 GOOD
07:00 77 GOOD
08:00 76 GOOD
09:00 76 GOOD
10:00 76 GOOD
11:00 69 GOOD
12:00 · now 66 GOOD