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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.

33.0, -96.8 · EM13nb · 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
22.0
km · 13.7 mi
Bearing
67.5°
true · rev 247.5°
Terrain
BLOCKED
89.4 dB diffraction
Propagation
71/100
GOOD
Margin
-25.4
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 volume5 m AGL at the midpoint (14 m above the chord, 7 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 5.9 m) clears with margin. The geometric line of sight is obstructed — buried 29 m below terrain at its worst point.

Great circle
33.045, -96.834 → 33.12, -96.615 · 67.5°
Loss budget · 47 GHz
FSPL (free-space) 152.7 dB
Gaseous (O₂ + H₂O) 1.4 dB
Diffraction 89.4 dB
Rain attenuation 0.0 dB
Total path loss 243.4 dB
Gas rate 0.0614 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 7.1 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 -243.4 dB
RX antenna gain 30.0 dBi
RX power -165.4 dBm
Sensitivity (CW, 500 Hz) -141.0 dBm
Margin -25.4 dB
Path weather · HRRR average of 9 samples
Temperature
81.5 °F
27.5 °C
Dewpoint
44.0 °F
6.7 °C
T/Td gap
37.5 °F
20.8 °C
Abs. humidity
7.1
g/m³
Pressure
992.1
mb
PWAT
16.8
mm
BL depth
2376.3
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz 71/100
Rain
100 14%
Humidity
88 13%
PWAT
80 11%
Season
55 11%
T-Td Depression
96 10%
Refractivity
50 10%
Pressure
70 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 33.0, -96.8 27.1 °C 7.5 °C 995.0 mb 2330.0 16.8 mm
13% 33.1, -96.8 27.2 °C 6.3 °C 993.3 mb 2401.0 17.5 mm
25% 33.1, -96.8 27.0 °C 6.8 °C 992.1 mb 2289.3 16.2 mm
38% 33.1, -96.8 27.0 °C 6.8 °C 992.1 mb 2289.3 16.2 mm
Midpoint 33.1, -96.7 27.0 °C 6.8 °C 992.1 mb 2289.3 16.2 mm
63% 33.1, -96.7 27.0 °C 6.8 °C 992.1 mb 2289.3 16.2 mm
75% 33.1, -96.7 28.4 °C 6.3 °C 993.9 mb 2499.5 17.5 mm
88% 33.1, -96.6 28.4 °C 6.3 °C 993.9 mb 2499.5 17.5 mm
Destination 33.1, -96.6 28.4 °C 6.3 °C 993.9 mb 2499.5 17.5 mm
Midpoint vertical profile
18-hour forecast · this path · 47 GHz → steady
Propagation score for this path over the next 18 hours. 0 25 50 75 100
Peak 80 at 01:00 UTC · low 66 at 13:00 UTC
Hour-by-hour propagation score for this path — the series plotted above.
Hour UTC Score Rating
20:00 78 GOOD
21:00 76 GOOD
22:00 77 GOOD
23:00 79 GOOD
00:00 78 GOOD
01:00 80 EXCELLENT
02:00 80 EXCELLENT
03:00 78 GOOD
04:00 78 GOOD
05:00 79 GOOD
06:00 80 EXCELLENT
07:00 80 EXCELLENT
08:00 80 EXCELLENT
09:00 79 GOOD
10:00 80 EXCELLENT
11:00 78 GOOD
12:00 67 GOOD
13:00 · now 66 GOOD