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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.

32.9, -99.2 · EM02jw · 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 22:00z · 9/9 path points
Distance
260.2
km · 161.7 mi
Bearing
82.8°
true · rev 262.8°
Terrain
BLOCKED
130.1 dB diffraction
Propagation
73/100
GOOD
Margin
-74.6
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 volume664 m AGL at the midpoint (1992 m above the chord, 996 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 44.2 m) clears with margin. The geometric line of sight is obstructed — buried 1051 m below terrain at its worst point.

Great circle
32.926, -99.226 → 33.189, -96.452 · 82.8°
Loss budget · 10 GHz
FSPL (free-space) 160.7 dB
Gaseous (O₂ + H₂O) 1.8 dB
Diffraction 130.1 dB
Rain attenuation 0.0 dB
Total path loss 292.6 dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 14.6 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 -292.6 dB
RX antenna gain 30.0 dBi
RX power -214.6 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -74.6 dB
Path weather · HRRR average of 9 samples
Temperature
67.0 °F
19.5 °C
Dewpoint
63.1 °F
17.3 °C
T/Td gap
3.9 °F
2.2 °C
Abs. humidity
14.6
g/m³
Pressure
970.6
mb
PWAT
38.7
mm
BL depth
527.4
m AGL
Refrac. gradient
-73.9
N/km
Propagation factors · 10 GHz 73/100
Rain
100 14%
Humidity
95 13%
PWAT
70 11%
Season
68 11%
T-Td Depression
75 10%
Refractivity
55 10%
Pressure
88 10%
Sky Cover
50 8%
Wind
50 8%
Time of Day
18 4%
Atmospheric profile HRRR 3 km Valid 2026-05-10 22:00 UTC · 9 samples
Point Lat, lon Temp Dewpt Press dN/dh BL m PWAT Duct
Source 32.9, -99.2 19.1 °C 16.9 °C 970.6 mb -54.7 763.4 39.0 mm
13% 33.0, -98.9 18.8 °C 16.6 °C 972.8 mb -63.0 523.0 37.8 mm
25% 33.0, -98.5 20.1 °C 17.0 °C 978.6 mb -70.6 539.6 38.2 mm
38% 33.0, -98.2 19.7 °C 17.3 °C 979.6 mb -71.3 487.6 38.2 mm
Midpoint 33.1, -97.8 19.6 °C 17.1 °C 973.4 mb -73.9 454.5 33.7 mm
63% 33.1, -97.5 20.0 °C 17.8 °C 983.9 mb -57.2 529.6 40.3 mm
75% 33.1, -97.1 19.7 °C 17.5 °C 996.1 mb -61.4 481.8 40.8 mm
88% 33.2, -96.8 19.0 °C 17.7 °C 992.4 mb -61.5 471.6 40.4 mm
Destination 33.2, -96.5 19.1 °C 17.4 °C 996.3 mb -67.2 495.6 40.4 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 85 at 13:00 UTC · low 68 at 22:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
22:00 68 GOOD
23:00 70 GOOD
00:00 70 GOOD
01:00 68 GOOD
02:00 72 GOOD
03:00 72 GOOD
04:00 77 GOOD
05:00 68 GOOD
06:00 74 GOOD
07:00 70 GOOD
08:00 71 GOOD
09:00 73 GOOD
10:00 75 GOOD
11:00 75 GOOD
12:00 83 EXCELLENT
13:00 85 EXCELLENT
14:00 · now 84 EXCELLENT