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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.

34.0, -98.7 · EM03px · 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
214.4
km · 133.2 mi
Bearing
115.5°
true · rev 295.5°
Terrain
BLOCKED
143.8 dB diffraction
Propagation
73/100
GOOD
Margin
-111.3
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 volume451 m AGL at the midpoint (1353 m above the chord, 676 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 18.5 m) clears with margin. The geometric line of sight is obstructed — buried 743 m below terrain at its worst point.

Great circle
33.966, -98.694 → 33.12, -96.615 · 115.5°
Loss budget · 47 GHz
FSPL (free-space) 172.5 dB
Gaseous (O₂ + H₂O) 13.0 dB
Diffraction 143.8 dB
Rain attenuation 0.0 dB
Total path loss 329.3 dB
Gas rate 0.0606 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 -329.3 dB
RX antenna gain 30.0 dBi
RX power -251.3 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -111.3 dB
Path weather · HRRR average of 9 samples
Temperature
80.5 °F
27.0 °C
Dewpoint
43.2 °F
6.2 °C
T/Td gap
37.3 °F
20.7 °C
Abs. humidity
6.9
g/m³
Pressure
977.6
mb
PWAT
14.0
mm
BL depth
2293.3
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 34.0, -98.7 27.9 °C 4.0 °C 977.6 mb 2329.7 12.2 mm
13% 33.9, -98.4 27.7 °C 4.5 °C 980.7 mb 2319.0 12.5 mm
25% 33.8, -98.2 27.2 °C 4.5 °C 982.8 mb 2334.2 12.2 mm
38% 33.6, -97.9 26.4 °C 5.1 °C 979.0 mb 2249.9 12.3 mm
Midpoint 33.5, -97.7 25.4 °C 8.8 °C 982.0 mb 2240.3 15.2 mm
63% 33.4, -97.4 24.7 °C 9.8 °C 983.6 mb 2071.5 15.0 mm
75% 33.3, -97.1 27.3 °C 7.0 °C 993.0 mb 2235.5 14.1 mm
88% 33.2, -96.9 27.7 °C 6.0 °C 995.5 mb 2360.1 15.5 mm
Destination 33.1, -96.6 28.4 °C 6.3 °C 993.9 mb 2499.5 17.5 mm
Midpoint vertical profile
18-hour forecast · this path · 47 GHz → steady
Propagation score for this path over the next 18 hours. 0 25 50 75 100
Peak 80 at 21:00 UTC · low 64 at 12:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
20:00 78 GOOD
21:00 80 EXCELLENT
22:00 80 EXCELLENT
23:00 80 EXCELLENT
00:00 75 GOOD
01:00 67 GOOD
02:00 69 GOOD
03:00 78 GOOD
04:00 77 GOOD
05:00 75 GOOD
06:00 75 GOOD
07:00 76 GOOD
08:00 75 GOOD
09:00 74 GOOD
10:00 75 GOOD
11:00 68 GOOD
12:00 64 MARGINAL
13:00 · now 64 MARGINAL