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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.

34.2, -97.6 · EM14fe · 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
149.8
km · 93.1 mi
Bearing
136.6°
true · rev 316.6°
Terrain
BLOCKED
129.2 dB diffraction
Propagation
73/100
GOOD
Margin
-89.6
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 volume220 m AGL at the midpoint (660 m above the chord, 330 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 15.5 m) clears with margin. The geometric line of sight is obstructed — buried 356 m below terrain at its worst point.

Great circle
34.173, -97.557 → 33.189, -96.452 · 136.6°
Loss budget · 47 GHz
FSPL (free-space) 169.4 dB
Gaseous (O₂ + H₂O) 9.1 dB
Diffraction 129.2 dB
Rain attenuation 0.0 dB
Total path loss 307.6 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 -307.6 dB
RX antenna gain 30.0 dBi
RX power -229.6 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -89.6 dB
Path weather · HRRR average of 9 samples
Temperature
81.1 °F
27.3 °C
Dewpoint
43.3 °F
6.3 °C
T/Td gap
37.8 °F
21.0 °C
Abs. humidity
6.9
g/m³
Pressure
980.3
mb
PWAT
13.7
mm
BL depth
2278.0
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
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 34.2, -97.6 26.8 °C 5.9 °C 980.3 mb 2272.1 11.7 mm
13% 34.0, -97.4 27.3 °C 8.2 °C 985.8 mb 2389.9 16.8 mm
25% 33.9, -97.3 27.4 °C 9.0 °C 985.2 mb 2287.7 16.2 mm
38% 33.8, -97.1 27.7 °C 7.1 °C 990.2 mb 2281.7 14.4 mm
Midpoint 33.7, -97.0 26.8 °C 6.2 °C 989.8 mb 2157.8 12.2 mm
63% 33.6, -96.9 27.3 °C 5.4 °C 992.6 mb 2120.7 11.8 mm
75% 33.4, -96.7 26.8 °C 5.1 °C 990.1 mb 2214.9 12.3 mm
88% 33.3, -96.6 27.8 °C 5.4 °C 994.2 mb 2397.3 14.6 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 · 47 GHz → steady
Propagation score for this path over the next 17 hours. 0 25 50 75 100
Peak 80 at 00:00 UTC · low 67 at 12:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
20:00 79 GOOD
21:00 79 GOOD
22:00 78 GOOD
23:00 78 GOOD
00:00 80 EXCELLENT
01:00 78 GOOD
02:00 79 GOOD
03:00 79 GOOD
04:00 80 EXCELLENT
05:00 80 EXCELLENT
06:00 78 GOOD
07:00 80 EXCELLENT
08:00 77 GOOD
09:00 77 GOOD
10:00 78 GOOD
11:00 78 GOOD
12:00 · now 67 GOOD