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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.

32.7, -97.3 · EM12ir · 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
79.3
km · 49.3 mi
Bearing
56.4°
true · rev 236.4°
Terrain
BLOCKED
96.5 dB diffraction
Propagation
53/100
MARGINAL
Margin
-40.4
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 volume62 m AGL at the midpoint (185 m above the chord, 93 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 15.7 m) clears with margin. The geometric line of sight is obstructed — buried 91 m below terrain at its worst point.

Great circle
32.727, -97.325 → 33.12, -96.615 · 56.4°
Loss budget · 24 GHz
FSPL (free-space) 158.0 dB
Gaseous (O₂ + H₂O) 3.9 dB
Diffraction 96.5 dB
Rain attenuation 0.0 dB
Total path loss 258.4 dB
Gas rate 0.0497 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 14.8 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 -258.4 dB
RX antenna gain 30.0 dBi
RX power -180.4 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -40.4 dB
Path weather · HRRR average of 9 samples
Temperature
71.0 °F
21.7 °C
Dewpoint
63.7 °F
17.6 °C
T/Td gap
7.4 °F
4.1 °C
Abs. humidity
14.8
g/m³
Pressure
992.5
mb
PWAT
39.4
mm
BL depth
575.9
m AGL
Refrac. gradient
-79.0
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
62 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 32.7, -97.3 23.1 °C 17.5 °C 995.6 mb -56.2 722.7 39.0 mm
13% 32.8, -97.2 23.6 °C 16.6 °C 995.3 mb -63.4 667.2 39.7 mm
25% 32.8, -97.1 22.8 °C 17.9 °C 995.4 mb -79.0 577.1 40.0 mm
38% 32.9, -97.1 23.3 °C 17.6 °C 997.2 mb -77.9 606.7 39.1 mm
Midpoint 32.9, -97.0 23.3 °C 17.6 °C 997.2 mb -77.9 606.7 39.1 mm
63% 33.0, -96.9 20.7 °C 18.0 °C 995.4 mb -63.4 597.5 39.5 mm
75% 33.0, -96.8 19.7 °C 17.5 °C 993.4 mb -63.8 482.7 37.7 mm
88% 33.1, -96.7 19.5 °C 17.9 °C 992.5 mb -63.7 466.5 40.1 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 12:00 UTC · low 43 at 02:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
21:00 57 MARGINAL
22:00 53 MARGINAL
23:00 51 MARGINAL
00:00 48 POOR
01:00 49 POOR
02:00 43 POOR
03:00 55 MARGINAL
04:00 54 MARGINAL
05:00 53 MARGINAL
06:00 53 MARGINAL
07:00 53 MARGINAL
08:00 52 MARGINAL
09:00 53 MARGINAL
10:00 55 MARGINAL
11:00 55 MARGINAL
12:00 60 MARGINAL
13:00 · now 59 MARGINAL