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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.

33.9, -97.1 · EM13lw · 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
100.8
km · 62.6 mi
Bearing
145.8°
true · rev 325.8°
Terrain
BLOCKED
116.2 dB diffraction
Propagation
73/100
GOOD
Margin
-70.2
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 volume100 m AGL at the midpoint (299 m above the chord, 149 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 12.7 m) clears with margin. The geometric line of sight is obstructed — buried 178 m below terrain at its worst point.

Great circle
33.94, -97.06 → 33.189, -96.452 · 145.8°
Loss budget · 47 GHz
FSPL (free-space) 165.9 dB
Gaseous (O₂ + H₂O) 6.0 dB
Diffraction 116.2 dB
Rain attenuation 0.0 dB
Total path loss 288.2 dB
Gas rate 0.0599 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 6.6 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 -288.2 dB
RX antenna gain 30.0 dBi
RX power -210.2 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -70.2 dB
Path weather · HRRR average of 9 samples
Temperature
81.0 °F
27.2 °C
Dewpoint
42.4 °F
5.8 °C
T/Td gap
38.6 °F
21.5 °C
Abs. humidity
6.6
g/m³
Pressure
985.9
mb
PWAT
14.6
mm
BL depth
2242.3
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz 73/100
Rain
100 14%
Humidity
91 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 22:00 UTC · 9 samples
Point Lat, lon Temp Dewpt Press dN/dh BL m PWAT Duct
Source 33.9, -97.1 28.1 °C 6.1 °C 988.9 mb 2325.9 15.5 mm
13% 33.8, -97.0 27.5 °C 6.2 °C 990.1 mb 2254.5 13.7 mm
25% 33.8, -96.9 26.8 °C 5.9 °C 988.8 mb 2150.5 13.7 mm
38% 33.7, -96.8 27.0 °C 3.4 °C 987.4 mb 2047.6 10.7 mm
Midpoint 33.6, -96.8 27.1 °C 3.9 °C 988.8 mb 2165.4 11.8 mm
63% 33.5, -96.7 27.2 °C 5.6 °C 985.9 mb 2253.9 15.2 mm
75% 33.4, -96.6 27.9 °C 5.9 °C 991.5 mb 2357.6 15.8 mm
88% 33.3, -96.5 26.8 °C 7.4 °C 994.0 mb 2312.6 17.4 mm
Destination 33.2, -96.5 26.8 °C 7.4 °C 994.0 mb 2312.6 17.4 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 22:00 UTC · low 64 at 14:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
22:00 80 EXCELLENT
23:00 79 GOOD
00:00 78 GOOD
01:00 80 EXCELLENT
02:00 80 EXCELLENT
03:00 76 GOOD
04:00 73 GOOD
05:00 79 GOOD
06:00 79 GOOD
07:00 79 GOOD
08:00 78 GOOD
09:00 76 GOOD
10:00 77 GOOD
11:00 77 GOOD
12:00 67 GOOD
13:00 66 GOOD
14:00 · now 64 MARGINAL