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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

33.1, -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
117.8
km · 73.2 mi
Bearing
304.3°
true · rev 124.3°
Terrain
BLOCKED
106.4 dB diffraction
Propagation
53/100
MARGINAL
Margin
-55.8
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 volume136 m AGL at the midpoint (409 m above the chord, 204 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 19.2 m) clears with margin. The geometric line of sight is obstructed — buried 186 m below terrain at its worst point.

Great circle
32.527, -95.57 → 33.12, -96.615 · 304.3°
Loss budget · 24 GHz
FSPL (free-space) 161.5 dB
Gaseous (O₂ + H₂O) 6.0 dB
Diffraction 106.4 dB
Rain attenuation 0.0 dB
Total path loss 273.8 dB
Gas rate 0.0506 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 15.3 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 -273.8 dB
RX antenna gain 30.0 dBi
RX power -195.8 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -55.8 dB
Path weather · HRRR average of 9 samples
Temperature
71.7 °F
22.1 °C
Dewpoint
64.6 °F
18.1 °C
T/Td gap
7.1 °F
4.0 °C
Abs. humidity
15.3
g/m³
Pressure
995.0
mb
PWAT
39.4
mm
BL depth
484.5
m AGL
Refrac. gradient
-92.4
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
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 32.5, -95.6 26.3 °C 19.6 °C 997.3 mb -70.4 567.3 38.1 mm
13% 32.6, -95.7 25.8 °C 18.3 °C 999.5 mb -56.9 591.2 38.3 mm
25% 32.7, -95.8 24.9 °C 18.4 °C 996.6 mb -59.1 516.5 39.7 mm
38% 32.7, -96.0 22.8 °C 18.2 °C 999.5 mb -92.4 447.0 39.3 mm
Midpoint 32.8, -96.1 21.6 °C 18.0 °C 999.0 mb -73.3 472.2 38.3 mm
63% 32.9, -96.2 20.3 °C 17.7 °C 999.3 mb -54.1 491.2 39.3 mm
75% 33.0, -96.4 18.7 °C 17.4 °C 996.5 mb -63.4 385.7 41.0 mm
88% 33.0, -96.5 18.9 °C 17.7 °C 999.8 mb -67.9 433.5 40.5 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 55 at 12:00 UTC · low 45 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 51 MARGINAL
23:00 51 MARGINAL
00:00 50 MARGINAL
01:00 50 MARGINAL
02:00 48 POOR
03:00 45 POOR
04:00 49 POOR
05:00 53 MARGINAL
06:00 53 MARGINAL
07:00 53 MARGINAL
08:00 52 MARGINAL
09:00 52 MARGINAL
10:00 54 MARGINAL
11:00 54 MARGINAL
12:00 55 MARGINAL
13:00 · now 55 MARGINAL