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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, -97.3 · EM12il · 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
94.2
km · 58.6 mi
Bearing
40.5°
true · rev 220.5°
Terrain
BLOCKED
92.9 dB diffraction
Propagation
53/100
MARGINAL
Margin
-39.1
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 volume87 m AGL at the midpoint (261 m above the chord, 131 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 17.2 m) clears with margin. The geometric line of sight is obstructed — buried 85 m below terrain at its worst point.

Great circle
32.477, -97.273 → 33.12, -96.615 · 40.5°
Loss budget · 24 GHz
FSPL (free-space) 159.5 dB
Gaseous (O₂ + H₂O) 4.7 dB
Diffraction 92.9 dB
Rain attenuation 0.0 dB
Total path loss 257.1 dB
Gas rate 0.0498 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 14.9 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 -257.1 dB
RX antenna gain 30.0 dBi
RX power -179.1 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -39.1 dB
Path weather · HRRR average of 9 samples
Temperature
71.8 °F
22.1 °C
Dewpoint
64.0 °F
17.8 °C
T/Td gap
7.8 °F
4.3 °C
Abs. humidity
14.9
g/m³
Pressure
987.9
mb
PWAT
39.2
mm
BL depth
519.8
m AGL
Refrac. gradient
-64.4
N/km
Propagation factors · 24 GHz 53/100
Rain
100 14%
Humidity
0 13%
PWAT
35 11%
Season
47 11%
T-Td Depression
38 10%
Refractivity
55 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 32.5, -97.3 24.1 °C 17.9 °C 987.9 mb -48.9 463.3 37.8 mm
13% 32.6, -97.2 24.1 °C 17.9 °C 987.9 mb -48.9 463.3 37.8 mm
25% 32.6, -97.1 22.1 °C 18.2 °C 993.3 mb -50.4 526.4 40.5 mm
38% 32.7, -97.0 23.7 °C 17.9 °C 999.8 mb -52.6 656.0 41.6 mm
Midpoint 32.8, -96.9 23.7 °C 17.9 °C 999.8 mb -52.6 656.0 41.6 mm
63% 32.9, -96.9 22.3 °C 17.4 °C 999.1 mb -64.4 491.9 38.1 mm
75% 33.0, -96.8 19.7 °C 17.5 °C 993.4 mb -63.8 482.7 37.7 mm
88% 33.0, -96.7 19.7 °C 17.5 °C 993.4 mb -63.8 482.7 37.7 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 · 24 GHz → steady
Propagation score for this path over the next 17 hours. 0 25 50 75 100
Peak 60 at 13:00 UTC · low 45 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 49 POOR
23:00 52 MARGINAL
00:00 50 MARGINAL
01:00 50 MARGINAL
02:00 45 POOR
03:00 52 MARGINAL
04:00 54 MARGINAL
05:00 52 MARGINAL
06:00 52 MARGINAL
07:00 53 MARGINAL
08:00 52 MARGINAL
09:00 52 MARGINAL
10:00 55 MARGINAL
11:00 56 MARGINAL
12:00 56 MARGINAL
13:00 · now 60 MARGINAL