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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.

32.1, -97.0 · EM12ld · 8.0 ft AGL

33.1, -96.6 · EM13qc · 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
116.3
km · 72.2 mi
Bearing
19.2°
true · rev 199.2°
Terrain
BLOCKED
115.4 dB diffraction
Propagation
55/100
MARGINAL
Margin
-74.9
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 volume ≈ 133 m AGL at the midpoint (398 m above the chord, 199 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 13.6 m) clears with margin. The geometric line of sight is obstructed — buried 181 m below terrain at its worst point.

Great circle
32.133, -97.026 → 33.12, -96.615 · 19.2°
Loss budget · 47 GHz
FSPL (free-space) 167.2 dB
Gaseous (O₂ + H₂O) 10.3 dB
Diffraction 115.4 dB
Rain attenuation 0.0 dB
Total path loss 292.9 dB
Gas rate 0.0882 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 16.0 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 -292.9 dB
RX antenna gain 30.0 dBi
RX power -214.9 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -74.9 dB
Path weather · HRRR average of 9 samples
Temperature
72.8 °F
22.7 °C
Dewpoint
66.1 °F
18.9 °C
T/Td gap
6.7 °F
3.7 °C
Abs. humidity
16.0
g/m³
Pressure
989.2
mb
PWAT
39.4
mm
BL depth
495.6
m AGL
Refrac. gradient
-76.4
N/km
Propagation factors · 47 GHz 55/100
Rain
100 14%
Humidity
24 13%
PWAT
35 11%
Season
55 11%
T-Td Depression
38 10%
Refractivity
62 10%
Pressure
82 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 32.1, -97.0 26.2 °C 20.9 °C 989.2 mb -52.1 684.7 39.1 mm —
13% 32.3, -97.0 25.6 °C 20.5 °C 992.2 mb -55.7 531.7 40.5 mm —
25% 32.4, -96.9 25.4 °C 19.7 °C 993.9 mb -58.1 496.9 39.8 mm —
38% 32.5, -96.9 23.4 °C 19.2 °C 990.9 mb -66.5 468.6 38.2 mm —
Midpoint 32.6, -96.8 21.8 °C 18.8 °C 993.3 mb -55.1 502.6 41.5 mm —
63% 32.7, -96.8 21.9 °C 18.1 °C 1001.4 mb -76.4 448.2 39.5 mm —
75% 32.9, -96.7 20.7 °C 17.6 °C 998.3 mb -73.4 433.5 37.3 mm —
88% 33.0, -96.7 19.7 °C 18.0 °C 998.0 mb -71.9 438.2 38.7 mm —
Destination 33.1, -96.6 19.4 °C 17.8 °C 995.0 mb -62.2 456.2 40.3 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 60 at 13:00 UTC · low 48 at 02:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
21:00 49 POOR
22:00 58 MARGINAL
23:00 50 MARGINAL
00:00 51 MARGINAL
01:00 52 MARGINAL
02:00 48 POOR
03:00 54 MARGINAL
04:00 54 MARGINAL
05:00 55 MARGINAL
06:00 54 MARGINAL
07:00 55 MARGINAL
08:00 54 MARGINAL
09:00 54 MARGINAL
10:00 56 MARGINAL
11:00 56 MARGINAL
12:00 58 MARGINAL
13:00 · now 60 MARGINAL