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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.

34.6, -93.4 · EM34hn · 8.0 ft AGL

33.1, -96.6 · EM13qc · 60.0 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 08:00z · 9/9 path points
Distance
337.0
km · 209.4 mi
Bearing
242.4°
true · rev 62.4°
Terrain
BLOCKED
148.0 dB diffraction
Propagation
63/100
MARGINAL
Margin
-116.2
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 volume1114 m AGL at the midpoint (3342 m above the chord, 1671 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 32.5 m) clears with margin. The geometric line of sight is obstructed — buried 1511 m below terrain at its worst point.

Great circle
34.564, -93.407 → 33.12, -96.615 · 242.4°
Loss budget · 24 GHz
FSPL (free-space) 170.6 dB
Gaseous (O₂ + H₂O) 15.6 dB
Diffraction 148.0 dB
Rain attenuation 0.0 dB
Total path loss 334.2 dB
Gas rate 0.0463 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 13.2 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 -334.2 dB
RX antenna gain 30.0 dBi
RX power -256.2 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -116.2 dB
Path weather · HRRR average of 9 samples
Temperature
67.9 °F
19.9 °C
Dewpoint
60.2 °F
15.6 °C
T/Td gap
7.7 °F
4.3 °C
Abs. humidity
13.2
g/m³
Pressure
980.2
mb
PWAT
24.7
mm
BL depth
175.9
m AGL
Refrac. gradient
-226.1
N/km · ducting
Propagation factors · 24 GHz 63/100
Rain
100 14%
Humidity
4 13%
PWAT
60 11%
Season
47 11%
T-Td Depression
38 10%
Refractivity
85 10%
Pressure
82 10%
Sky Cover
50 8%
Wind
50 8%
Time of Day
55 4%
Atmospheric profile HRRR 3 km Valid 2026-05-15 08:00 UTC · 9 samples
Point Lat, lon Temp Dewpt Press dN/dh BL m PWAT Duct
Source 34.6, -93.4 17.7 °C 13.0 °C 991.4 mb -116.4 166.2 25.0 mm
13% 34.4, -93.8 18.9 °C 11.8 °C 980.2 mb -130.0 271.1 23.0 mm
25% 34.2, -94.2 17.5 °C 13.5 °C 988.7 mb -148.3 71.8 26.4 mm
38% 34.0, -94.6 19.0 °C 15.6 °C 999.3 mb -226.1 75.0 28.2 mm
Midpoint 33.8, -95.0 19.4 °C 17.6 °C 998.6 mb -144.8 131.8 26.7 mm
63% 33.7, -95.4 19.5 °C 18.6 °C 992.7 mb -146.2 189.0 24.5 mm
75% 33.5, -95.8 21.3 °C 17.1 °C 991.0 mb -127.9 182.8 25.0 mm
88% 33.3, -96.2 22.0 °C 17.5 °C 986.9 mb -123.7 228.7 21.5 mm
Destination 33.1, -96.6 24.1 °C 16.0 °C 987.4 mb -91.5 266.6 22.0 mm
Midpoint vertical profile
18-hour forecast · this path · 24 GHz → steady
Propagation score for this path over the next 18 hours. 0 25 50 75 100
Peak 63 at 14:00 UTC · low 53 at 00:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
08:00 58 MARGINAL
09:00 58 MARGINAL
10:00 60 MARGINAL
11:00 60 MARGINAL
12:00 62 MARGINAL
13:00 62 MARGINAL
14:00 63 MARGINAL
15:00 62 MARGINAL
16:00 60 MARGINAL
17:00 60 MARGINAL
18:00 60 MARGINAL
19:00 59 MARGINAL
20:00 59 MARGINAL
21:00 56 MARGINAL
22:00 54 MARGINAL
23:00 54 MARGINAL
00:00 53 MARGINAL
01:00 · now 53 MARGINAL