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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.

32.9, -96.5 · EM12sv · 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
28.2
km · 17.5 mi
Bearing
332.8°
true · rev 152.8°
Terrain
BLOCKED
20.1 dB diffraction
Propagation
67/100
GOOD
Margin
+56.2
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 volume ≈ 8 m AGL at the midpoint (23 m above the chord, 12 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 14.5 m) clears with margin. The geometric line of sight is obstructed — buried 1 m below terrain at its worst point.

Great circle
32.894, -96.477 → 33.12, -96.615 · 332.8°
Loss budget · 10 GHz
FSPL (free-space) 141.4 dB
Gaseous (O₂ + H₂O) 0.2 dB
Diffraction 20.1 dB
Rain attenuation 0.0 dB
Total path loss 161.8 dB
Gas rate 0.0071 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 15.1 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 -161.8 dB
RX antenna gain 30.0 dBi
RX power -83.8 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin 56.2 dB
Path weather · HRRR average of 9 samples
Temperature
67.0 °F
19.4 °C
Dewpoint
64.1 °F
17.8 °C
T/Td gap
2.9 °F
1.6 °C
Abs. humidity
15.1
g/m³
Pressure
995.0
mb
PWAT
39.9
mm
BL depth
440.8
m AGL
Refrac. gradient
-71.9
N/km
Propagation factors · 10 GHz 67/100
Rain
100 14%
Humidity
95 13%
PWAT
70 11%
Season
68 11%
T-Td Depression
40 10%
Refractivity
55 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 32.9, -96.5 20.1 °C 17.9 °C 1001.5 mb -62.8 429.9 39.2 mm —
13% 32.9, -96.5 20.1 °C 17.9 °C 1001.5 mb -62.8 429.9 39.2 mm —
25% 33.0, -96.5 18.9 °C 17.7 °C 999.8 mb -67.9 433.5 40.5 mm —
38% 33.0, -96.5 18.9 °C 17.7 °C 999.8 mb -67.9 433.5 40.5 mm —
Midpoint 33.0, -96.5 18.9 °C 17.7 °C 999.8 mb -67.9 433.5 40.5 mm —
63% 33.0, -96.6 19.7 °C 18.0 °C 998.0 mb -71.9 438.2 38.7 mm —
75% 33.1, -96.6 19.4 °C 17.8 °C 995.0 mb -62.2 456.2 40.3 mm —
88% 33.1, -96.6 19.4 °C 17.8 °C 995.0 mb -62.2 456.2 40.3 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 · 10 GHz → steady
Propagation score for this path over the next 17 hours. 0 25 50 75 100
Peak 75 at 13:00 UTC · low 62 at 02:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
21:00 63 MARGINAL
22:00 66 GOOD
23:00 71 GOOD
00:00 64 MARGINAL
01:00 68 GOOD
02:00 62 MARGINAL
03:00 64 MARGINAL
04:00 70 GOOD
05:00 67 GOOD
06:00 67 GOOD
07:00 68 GOOD
08:00 66 GOOD
09:00 70 GOOD
10:00 72 GOOD
11:00 71 GOOD
12:00 72 GOOD
13:00 · now 75 GOOD