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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.

34.3, -97.4 · EM14gh · 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
156.3
km · 97.1 mi
Bearing
144.2°
true · rev 324.2°
Terrain
BLOCKED
109.6 dB diffraction
Propagation
67/100
GOOD
Margin
-49.0
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 volume240 m AGL at the midpoint (719 m above the chord, 359 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 34.2 m) clears with margin. The geometric line of sight is obstructed — buried 372 m below terrain at its worst point.

Great circle
34.333, -97.434 → 33.189, -96.452 · 144.2°
Loss budget · 10 GHz
FSPL (free-space) 156.3 dB
Gaseous (O₂ + H₂O) 1.1 dB
Diffraction 109.6 dB
Rain attenuation 0.0 dB
Total path loss 267.0 dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 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 -267.0 dB
RX antenna gain 30.0 dBi
RX power -189.0 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -49.0 dB
Path weather · HRRR average of 9 samples
Temperature
81.3 °F
27.4 °C
Dewpoint
43.2 °F
6.2 °C
T/Td gap
38.0 °F
21.1 °C
Abs. humidity
6.9
g/m³
Pressure
980.0
mb
PWAT
13.9
mm
BL depth
2293.4
m AGL
Refrac. gradient
0
N/km
Propagation factors · 10 GHz 67/100
Rain
100 14%
Humidity
70 13%
PWAT
75 11%
Season
68 11%
T-Td Depression
55 10%
Refractivity
50 10%
Pressure
82 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 34.3, -97.4 27.8 °C 7.0 °C 980.0 mb 2451.4 15.8 mm
13% 34.2, -97.3 26.9 °C 6.7 °C 984.1 mb 2278.3 12.6 mm
25% 34.0, -97.2 26.7 °C 8.4 °C 982.9 mb 2300.6 15.1 mm
38% 33.9, -97.1 27.8 °C 7.6 °C 987.0 mb 2340.2 15.4 mm
Midpoint 33.8, -96.9 26.9 °C 6.0 °C 986.5 mb 2177.0 13.2 mm
63% 33.6, -96.8 27.4 °C 6.2 °C 988.7 mb 2225.4 13.4 mm
75% 33.5, -96.7 27.1 °C 5.9 °C 990.2 mb 2210.9 12.9 mm
88% 33.3, -96.6 27.9 °C 4.2 °C 993.0 mb 2277.3 13.1 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 81 at 10:00 UTC · low 69 at 01:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
20:00 74 GOOD
21:00 73 GOOD
22:00 75 GOOD
23:00 75 GOOD
00:00 74 GOOD
01:00 69 GOOD
02:00 69 GOOD
03:00 73 GOOD
04:00 79 GOOD
05:00 79 GOOD
06:00 79 GOOD
07:00 79 GOOD
08:00 80 EXCELLENT
09:00 80 EXCELLENT
10:00 81 EXCELLENT
11:00 81 EXCELLENT
12:00 · now 75 GOOD