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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.

34.0, -96.8 · EM14oa · 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
98.6
km · 61.2 mi
Bearing
161.0°
true · rev 341.0°
Terrain
BLOCKED
107.6 dB diffraction
Propagation
54/100
MARGINAL
Margin
-54.4
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 volume95 m AGL at the midpoint (286 m above the chord, 143 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 17.6 m) clears with margin. The geometric line of sight is obstructed — buried 179 m below terrain at its worst point.

Great circle
34.027, -96.797 → 33.189, -96.452 · 161.0°
Loss budget · 24 GHz
FSPL (free-space) 159.9 dB
Gaseous (O₂ + H₂O) 4.9 dB
Diffraction 107.6 dB
Rain attenuation 0.0 dB
Total path loss 272.4 dB
Gas rate 0.0495 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 -272.4 dB
RX antenna gain 30.0 dBi
RX power -194.4 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -54.4 dB
Path weather · HRRR average of 9 samples
Temperature
68.2 °F
20.1 °C
Dewpoint
63.5 °F
17.5 °C
T/Td gap
4.7 °F
2.6 °C
Abs. humidity
14.8
g/m³
Pressure
989.4
mb
PWAT
38.5
mm
BL depth
627.1
m AGL
Refrac. gradient
-78.0
N/km
Propagation factors · 24 GHz 54/100
Rain
100 14%
Humidity
0 13%
PWAT
35 11%
Season
47 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 34.0, -96.8 19.1 °C 16.8 °C 990.5 mb -78.0 577.5 34.7 mm
13% 33.9, -96.8 20.1 °C 17.3 °C 992.2 mb -68.7 593.2 34.7 mm
25% 33.8, -96.7 20.1 °C 17.3 °C 992.2 mb -68.7 593.2 34.7 mm
38% 33.7, -96.7 20.5 °C 17.4 °C 989.7 mb -70.7 705.4 37.1 mm
Midpoint 33.6, -96.6 20.1 °C 17.4 °C 992.2 mb -65.2 624.0 37.8 mm
63% 33.5, -96.6 20.3 °C 17.6 °C 989.4 mb -62.7 611.2 41.1 mm
75% 33.4, -96.5 20.7 °C 17.8 °C 995.8 mb -56.6 738.5 43.3 mm
88% 33.3, -96.5 20.1 °C 17.9 °C 997.2 mb -58.9 600.2 41.5 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 · 24 GHz → steady
Propagation score for this path over the next 17 hours. 0 25 50 75 100
Peak 62 at 10:00 UTC · low 49 at 03:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
21:00 51 MARGINAL
22:00 50 MARGINAL
23:00 50 MARGINAL
00:00 50 MARGINAL
01:00 52 MARGINAL
02:00 50 MARGINAL
03:00 49 POOR
04:00 54 MARGINAL
05:00 55 MARGINAL
06:00 59 MARGINAL
07:00 60 MARGINAL
08:00 59 MARGINAL
09:00 59 MARGINAL
10:00 62 MARGINAL
11:00 61 MARGINAL
12:00 62 MARGINAL
13:00 · now 62 MARGINAL