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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, -98.5 · EM03rf · 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
180.1
km · 111.9 mi
Bearing
93.2°
true · rev 273.2°
Terrain
BLOCKED
114.1 dB diffraction
Propagation
68/100
GOOD
Margin
-54.9
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 volume318 m AGL at the midpoint (955 m above the chord, 477 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 36.8 m) clears with margin. The geometric line of sight is obstructed — buried 482 m below terrain at its worst point.

Great circle
33.226, -98.546 → 33.12, -96.615 · 93.2°
Loss budget · 10 GHz
FSPL (free-space) 157.5 dB
Gaseous (O₂ + H₂O) 1.3 dB
Diffraction 114.1 dB
Rain attenuation 0.0 dB
Total path loss 272.9 dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 6.7 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 -272.9 dB
RX antenna gain 30.0 dBi
RX power -194.9 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -54.9 dB
Path weather · HRRR average of 9 samples
Temperature
80.5 °F
27.0 °C
Dewpoint
42.6 °F
5.9 °C
T/Td gap
37.9 °F
21.1 °C
Abs. humidity
6.7
g/m³
Pressure
970.9
mb
PWAT
13.2
mm
BL depth
2307.0
m AGL
Refrac. gradient
0
N/km
Propagation factors · 10 GHz 68/100
Rain
100 14%
Humidity
70 13%
PWAT
75 11%
Season
68 11%
T-Td Depression
55 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 33.2, -98.5 26.3 °C 4.7 °C 970.9 mb 2223.1 11.9 mm
13% 33.2, -98.3 26.9 °C 5.2 °C 978.1 mb 2228.6 12.2 mm
25% 33.2, -98.1 26.9 °C 5.5 °C 981.1 mb 2268.8 12.6 mm
38% 33.2, -97.8 27.3 °C 3.8 °C 984.9 mb 2338.0 11.1 mm
Midpoint 33.2, -97.6 27.3 °C 7.3 °C 989.5 mb 2445.7 16.2 mm
63% 33.2, -97.3 25.2 °C 10.1 °C 989.3 mb 2294.0 15.1 mm
75% 33.1, -97.1 27.1 °C 6.3 °C 996.2 mb 2253.7 12.1 mm
88% 33.1, -96.9 27.3 °C 6.2 °C 995.3 mb 2332.9 14.2 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 07:00 UTC · low 66 at 02:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
20:00 76 GOOD
21:00 73 GOOD
22:00 73 GOOD
23:00 74 GOOD
00:00 67 GOOD
01:00 68 GOOD
02:00 66 GOOD
03:00 79 GOOD
04:00 80 EXCELLENT
05:00 82 EXCELLENT
06:00 82 EXCELLENT
07:00 83 EXCELLENT
08:00 80 EXCELLENT
09:00 80 EXCELLENT
10:00 81 EXCELLENT
11:00 73 GOOD
12:00 · now 76 GOOD