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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.

32.5, -95.6 · EM22fm · 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
110.4
km · 68.6 mi
Bearing
312.0°
true · rev 132.0°
Terrain
BLOCKED
109.9 dB diffraction
Propagation
55/100
MARGINAL
Margin
-68.2
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 volume120 m AGL at the midpoint (359 m above the chord, 179 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 13.3 m) clears with margin. The geometric line of sight is obstructed — buried 148 m below terrain at its worst point.

Great circle
32.527, -95.57 → 33.189, -96.452 · 312.0°
Loss budget · 47 GHz
FSPL (free-space) 166.7 dB
Gaseous (O₂ + H₂O) 9.5 dB
Diffraction 109.9 dB
Rain attenuation 0.0 dB
Total path loss 286.2 dB
Gas rate 0.0862 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 15.4 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 -286.2 dB
RX antenna gain 30.0 dBi
RX power -208.2 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -68.2 dB
Path weather · HRRR average of 9 samples
Temperature
72.1 °F
22.3 °C
Dewpoint
64.9 °F
18.3 °C
T/Td gap
7.2 °F
4.0 °C
Abs. humidity
15.4
g/m³
Pressure
997.2
mb
PWAT
39.4
mm
BL depth
524.8
m AGL
Refrac. gradient
-108.5
N/km · super-refractive
Propagation factors · 47 GHz 55/100
Rain
100 14%
Humidity
28 13%
PWAT
35 11%
Season
55 11%
T-Td Depression
38 10%
Refractivity
72 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 32.5, -95.6 26.3 °C 19.6 °C 997.3 mb -70.4 567.3 38.1 mm
13% 32.6, -95.7 25.4 °C 19.2 °C 1000.7 mb -60.5 605.4 38.0 mm
25% 32.7, -95.8 24.6 °C 17.7 °C 1002.2 mb -51.7 535.4 38.6 mm
38% 32.8, -95.9 23.6 °C 18.1 °C 999.4 mb -61.8 501.5 39.7 mm
Midpoint 32.9, -96.0 21.5 °C 17.9 °C 1000.6 mb -108.5 508.4 40.1 mm
63% 32.9, -96.1 20.9 °C 18.4 °C 999.9 mb -82.0 516.6 40.1 mm
75% 33.0, -96.2 18.9 °C 17.8 °C 999.4 mb -53.7 415.5 39.2 mm
88% 33.1, -96.3 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 57 at 11:00 UTC · low 39 at 04:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
21:00 49 POOR
22:00 48 POOR
23:00 49 POOR
00:00 51 MARGINAL
01:00 52 MARGINAL
02:00 52 MARGINAL
03:00 41 POOR
04:00 39 POOR
05:00 54 MARGINAL
06:00 55 MARGINAL
07:00 54 MARGINAL
08:00 55 MARGINAL
09:00 56 MARGINAL
10:00 56 MARGINAL
11:00 57 MARGINAL
12:00 56 MARGINAL
13:00 · now 56 MARGINAL