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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.

33.5, -96.9 · EM13nl · 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
48.8
km · 30.3 mi
Bearing
128.7°
true · rev 308.7°
Terrain
BLOCKED
95.2 dB diffraction
Propagation
72/100
GOOD
Margin
-39.7
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 volume23 m AGL at the midpoint (70 m above the chord, 35 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 8.8 m) clears with margin. The geometric line of sight is obstructed — buried 63 m below terrain at its worst point.

Great circle
33.464, -96.861 → 33.189, -96.452 · 128.7°
Loss budget · 47 GHz
FSPL (free-space) 159.6 dB
Gaseous (O₂ + H₂O) 2.9 dB
Diffraction 95.2 dB
Rain attenuation 0.0 dB
Total path loss 257.7 dB
Gas rate 0.0584 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 6.2 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 -257.7 dB
RX antenna gain 30.0 dBi
RX power -179.7 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -39.7 dB
Path weather · HRRR average of 9 samples
Temperature
81.4 °F
27.4 °C
Dewpoint
40.5 °F
4.7 °C
T/Td gap
40.8 °F
22.7 °C
Abs. humidity
6.2
g/m³
Pressure
990.1
mb
PWAT
12.9
mm
BL depth
2286.6
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz 72/100
Rain
100 14%
Humidity
94 13%
PWAT
80 11%
Season
55 11%
T-Td Depression
96 10%
Refractivity
50 10%
Pressure
70 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 33.5, -96.9 27.3 °C 5.4 °C 992.6 mb 2120.7 11.8 mm
13% 33.4, -96.8 26.8 °C 5.1 °C 990.1 mb 2214.9 12.3 mm
25% 33.4, -96.8 26.8 °C 5.1 °C 990.1 mb 2214.9 12.3 mm
38% 33.4, -96.7 26.8 °C 5.1 °C 990.1 mb 2214.9 12.3 mm
Midpoint 33.3, -96.7 27.9 °C 4.2 °C 993.0 mb 2277.3 13.1 mm
63% 33.3, -96.6 27.8 °C 5.4 °C 994.2 mb 2397.3 14.6 mm
75% 33.3, -96.6 27.8 °C 4.1 °C 995.4 mb 2379.9 13.3 mm
88% 33.2, -96.5 27.8 °C 4.1 °C 995.4 mb 2379.9 13.3 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 20:00 UTC · low 68 at 12:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
20:00 80 EXCELLENT
21:00 80 EXCELLENT
22:00 79 GOOD
23:00 79 GOOD
00:00 80 EXCELLENT
01:00 79 GOOD
02:00 79 GOOD
03:00 80 EXCELLENT
04:00 78 GOOD
05:00 79 GOOD
06:00 79 GOOD
07:00 79 GOOD
08:00 79 GOOD
09:00 79 GOOD
10:00 78 GOOD
11:00 78 GOOD
12:00 · now 68 GOOD