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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.

33.2, -96.0 · EM23ad · 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 21:00z · 9/9 path points
Distance
43.2
km · 26.8 mi
Bearing
273.9°
true · rev 93.9°
Terrain
BLOCKED
90.6 dB diffraction
Propagation
49/100
POOR
Margin
-34.9
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 volume18 m AGL at the midpoint (55 m above the chord, 27 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 8.3 m) clears with margin. The geometric line of sight is obstructed — buried 44 m below terrain at its worst point.

Great circle
33.164, -95.989 → 33.189, -96.452 · 273.9°
Loss budget · 47 GHz
FSPL (free-space) 158.6 dB
Gaseous (O₂ + H₂O) 3.7 dB
Diffraction 90.6 dB
Rain attenuation 0.0 dB
Total path loss 252.9 dB
Gas rate 0.0852 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 15.1 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 -252.9 dB
RX antenna gain 30.0 dBi
RX power -174.9 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -34.9 dB
Path weather · HRRR average of 9 samples
Temperature
67.0 °F
19.4 °C
Dewpoint
64.0 °F
17.8 °C
T/Td gap
3.0 °F
1.7 °C
Abs. humidity
15.1
g/m³
Pressure
996.8
mb
PWAT
40.3
mm
BL depth
511.5
m AGL
Refrac. gradient
-71.9
N/km
Propagation factors · 47 GHz 49/100
Rain
100 14%
Humidity
31 13%
PWAT
15 11%
Season
55 11%
T-Td Depression
18 10%
Refractivity
55 10%
Pressure
70 10%
Sky Cover
50 8%
Wind
50 8%
Time of Day
18 4%
Atmospheric profile HRRR 3 km Valid 2026-05-10 21:00 UTC · 9 samples
Point Lat, lon Temp Dewpt Press dN/dh BL m PWAT Duct
Source 33.2, -96.0 20.1 °C 17.9 °C 997.4 mb -71.9 586.8 39.7 mm
13% 33.2, -96.0 20.1 °C 17.9 °C 997.4 mb -71.9 586.8 39.7 mm
25% 33.2, -96.1 19.9 °C 18.0 °C 998.6 mb -64.6 593.3 42.0 mm
38% 33.2, -96.2 19.9 °C 18.0 °C 998.6 mb -64.6 593.3 42.0 mm
Midpoint 33.2, -96.2 18.4 °C 17.4 °C 996.8 mb -69.8 348.7 39.6 mm
63% 33.2, -96.3 18.4 °C 17.4 °C 996.8 mb -69.8 348.7 39.6 mm
75% 33.2, -96.3 18.9 °C 17.7 °C 997.6 mb -63.8 472.8 39.3 mm
88% 33.2, -96.4 18.9 °C 17.7 °C 997.6 mb -63.8 472.8 39.3 mm
Destination 33.2, -96.5 20.1 °C 17.9 °C 997.2 mb -58.9 600.2 41.5 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 61 at 13:00 UTC · low 39 at 21:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
21:00 39 POOR
22:00 41 POOR
23:00 50 MARGINAL
00:00 48 POOR
01:00 51 MARGINAL
02:00 47 POOR
03:00 42 POOR
04:00 52 MARGINAL
05:00 54 MARGINAL
06:00 55 MARGINAL
07:00 56 MARGINAL
08:00 54 MARGINAL
09:00 55 MARGINAL
10:00 57 MARGINAL
11:00 58 MARGINAL
12:00 58 MARGINAL
13:00 · now 61 MARGINAL