Distance
278.8
km · 173.2 mi
Bearing
99.1°
true · rev 279.1°
Terrain
BLOCKED
152.5 dB diffraction
Propagation
73/100
GOOD
Margin
-126.1
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 ≈ 762 m AGL at the midpoint (2287 m above the chord, 1144 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 21.1 m) clears with margin. The geometric line of sight is obstructed — buried 1180 m below terrain at its worst point.
Great circle
33.621, -99.41 → 33.189, -96.452 · 99.1°
Loss budget · 47 GHz
FSPL (free-space)
174.8
dB
Gaseous (O₂ + H₂O)
16.8
dB
Diffraction
152.5
dB
Rain attenuation
0.0
dB
Total path loss
344.1
dB
Gas rate 0.0602 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 6.7 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
-344.1
dB
RX antenna gain
30.0
dBi
RX power
-266.1
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-126.1
dB
Path weather · HRRR average of 9 samples
Temperature
80.5 °F
26.9 °C
Dewpoint
42.6 °F
5.9 °C
T/Td gap
37.8 °F
21.0 °C
Abs. humidity
6.7
g/m³
Pressure
967.4
mb
PWAT
13.3
mm
BL depth
2293.2
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
73/100
Rain
100
14%
Humidity
90
13%
PWAT
80
11%
Season
55
11%
T-Td Depression
96
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
33.6, -99.4
27.2 °C
4.2 °C
967.4 mb
2350.4
12.8 mm
—
13%
33.6, -99.0
27.3 °C
4.8 °C
975.1 mb
2311.9
12.4 mm
—
25%
33.5, -98.7
27.3 °C
6.4 °C
977.4 mb
2315.8
14.7 mm
—
38%
33.5, -98.3
27.3 °C
3.0 °C
977.1 mb
2284.3
10.7 mm
—
Midpoint
33.4, -97.9
26.5 °C
5.2 °C
979.8 mb
2261.7
11.8 mm
—
63%
33.4, -97.6
24.9 °C
9.3 °C
985.6 mb
2215.8
14.1 mm
—
75%
33.3, -97.2
26.2 °C
9.6 °C
992.0 mb
2131.5
14.8 mm
—
88%
33.2, -96.8
27.8 °C
6.5 °C
995.5 mb
2387.5
15.4 mm
—
Destination
33.2, -96.5
27.8 °C
4.1 °C
995.4 mb
2379.9
13.3 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 81
at 03:00 UTC
· low 66
at 12:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 80 | EXCELLENT |
| 21:00 | 80 | EXCELLENT |
| 22:00 | 79 | GOOD |
| 23:00 | 79 | GOOD |
| 00:00 | 80 | EXCELLENT |
| 01:00 | 76 | GOOD |
| 02:00 | 72 | GOOD |
| 03:00 | 81 | EXCELLENT |
| 04:00 | 79 | GOOD |
| 05:00 | 79 | GOOD |
| 06:00 | 79 | GOOD |
| 07:00 | 77 | GOOD |
| 08:00 | 76 | GOOD |
| 09:00 | 76 | GOOD |
| 10:00 | 76 | GOOD |
| 11:00 | 69 | GOOD |
| 12:00 · now | 66 | GOOD |