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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.

32.0, -98.2 · EM01vx · 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 20:00z · 9/9 path points
Distance
197.1
km · 122.5 mi
Bearing
49.9°
true · rev 229.9°
Terrain
BLOCKED
116.1 dB diffraction
Propagation
68/100
GOOD
Margin
-57.8
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 volume381 m AGL at the midpoint (1143 m above the chord, 572 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 38.4 m) clears with margin. The geometric line of sight is obstructed — buried 535 m below terrain at its worst point.

Great circle
31.988, -98.234 → 33.12, -96.615 · 49.9°
Loss budget · 10 GHz
FSPL (free-space) 158.3 dB
Gaseous (O₂ + H₂O) 1.4 dB
Diffraction 116.1 dB
Rain attenuation 0.0 dB
Total path loss 275.8 dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 6.9 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 -275.8 dB
RX antenna gain 30.0 dBi
RX power -197.8 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -57.8 dB
Path weather · HRRR average of 9 samples
Temperature
80.5 °F
26.9 °C
Dewpoint
43.3 °F
6.3 °C
T/Td gap
37.2 °F
20.6 °C
Abs. humidity
6.9
g/m³
Pressure
969.1
mb
PWAT
14.7
mm
BL depth
2278.7
m AGL
Refrac. gradient
0
N/km
Propagation factors · 10 GHz 68/100
Rain
100 14%
Humidity
70 13%
PWAT
75 11%
Season
68 11%
T-Td Depression
55 10%
Refractivity
50 10%
Pressure
88 10%
Sky Cover
50 8%
Wind
50 8%
Time of Day
18 4%
Atmospheric profile HRRR 3 km Valid 2026-05-03 20:00 UTC · 9 samples
Point Lat, lon Temp Dewpt Press dN/dh BL m PWAT Duct
Source 32.0, -98.2 24.8 °C 5.8 °C 969.1 mb 1955.5 13.1 mm
13% 32.1, -98.0 25.6 °C 6.1 °C 974.9 mb 2010.6 13.5 mm
25% 32.3, -97.8 26.9 °C 6.1 °C 988.9 mb 2247.4 14.0 mm
38% 32.4, -97.6 27.3 °C 5.7 °C 989.4 mb 2280.4 13.5 mm
Midpoint 32.6, -97.4 27.1 °C 6.2 °C 987.4 mb 2337.1 14.3 mm
63% 32.7, -97.2 27.6 °C 6.2 °C 995.7 mb 2451.5 14.6 mm
75% 32.8, -97.0 27.7 °C 6.9 °C 997.5 mb 2396.2 15.6 mm
88% 33.0, -96.8 27.1 °C 7.5 °C 995.0 mb 2330.0 16.8 mm
Destination 33.1, -96.6 28.4 °C 6.3 °C 993.9 mb 2499.5 17.5 mm
Midpoint vertical profile
17-hour forecast · this path · 10 GHz → steady
Propagation score for this path over the next 17 hours. 0 25 50 75 100
Peak 81 at 08:00 UTC · low 66 at 00:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
20:00 74 GOOD
21:00 74 GOOD
22:00 74 GOOD
23:00 70 GOOD
00:00 66 GOOD
01:00 66 GOOD
02:00 67 GOOD
03:00 73 GOOD
04:00 71 GOOD
05:00 79 GOOD
06:00 72 GOOD
07:00 80 EXCELLENT
08:00 81 EXCELLENT
09:00 80 EXCELLENT
10:00 80 EXCELLENT
11:00 71 GOOD
12:00 · now 73 GOOD