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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.

34.7, -94.4 · EM24tq · 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 20:00z · 9/9 path points
Distance
251.6
km · 156.3 mi
Bearing
229.0°
true · rev 49.0°
Terrain
BLOCKED
118.4 dB diffraction
Propagation
69/100
GOOD
Margin
-62.6
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 volume621 m AGL at the midpoint (1862 m above the chord, 931 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 43.4 m) clears with margin. The geometric line of sight is obstructed — buried 635 m below terrain at its worst point.

Great circle
34.689, -94.411 → 33.189, -96.452 · 229.0°
Loss budget · 10 GHz
FSPL (free-space) 160.5 dB
Gaseous (O₂ + H₂O) 1.8 dB
Diffraction 118.4 dB
Rain attenuation 0.0 dB
Total path loss 280.6 dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 7.6 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 -280.6 dB
RX antenna gain 30.0 dBi
RX power -202.6 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -62.6 dB
Path weather · HRRR average of 9 samples
Temperature
80.7 °F
27.0 °C
Dewpoint
45.8 °F
7.7 °C
T/Td gap
34.8 °F
19.3 °C
Abs. humidity
7.6
g/m³
Pressure
979.5
mb
PWAT
15.3
mm
BL depth
2188.9
m AGL
Refrac. gradient
0
N/km
Propagation factors · 10 GHz 69/100
Rain
100 14%
Humidity
82 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 34.7, -94.4 25.2 °C 10.3 °C 979.5 mb 1689.5 15.6 mm
13% 34.5, -94.7 24.7 °C 11.7 °C 985.4 mb 1702.5 15.7 mm
25% 34.3, -94.9 25.2 °C 11.9 °C 988.4 mb 1967.7 16.4 mm
38% 34.1, -95.2 27.7 °C 8.0 °C 997.6 mb 2338.8 15.1 mm
Midpoint 33.9, -95.4 29.0 °C 5.3 °C 999.2 mb 2450.1 15.8 mm
63% 33.8, -95.7 28.0 °C 6.0 °C 996.7 mb 2353.0 14.9 mm
75% 33.6, -95.9 27.2 °C 7.0 °C 994.9 mb 2326.5 14.9 mm
88% 33.4, -96.2 28.4 °C 4.9 °C 991.2 mb 2492.0 16.1 mm
Destination 33.2, -96.5 27.8 °C 4.1 °C 995.4 mb 2379.9 13.3 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 82 at 12:00 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 72 GOOD
21:00 73 GOOD
22:00 72 GOOD
23:00 72 GOOD
00:00 73 GOOD
01:00 72 GOOD
02:00 66 GOOD
03:00 68 GOOD
04:00 69 GOOD
05:00 70 GOOD
06:00 71 GOOD
07:00 70 GOOD
08:00 78 GOOD
09:00 78 GOOD
10:00 81 EXCELLENT
11:00 81 EXCELLENT
12:00 · now 82 EXCELLENT