Distance
356.2
km · 221.3 mi
Bearing
230.9°
true · rev 50.9°
Terrain
BLOCKED
157.5 dB diffraction
Propagation
72/100
GOOD
Margin
-138.9
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 ≈ 1245 m AGL at the midpoint (3734 m above the chord, 1867 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 23.8 m) clears with margin. The geometric line of sight is obstructed — buried 1571 m below terrain at its worst point.
Great circle
35.175, -93.646 → 33.12, -96.615 · 230.9°
Loss budget · 47 GHz
FSPL (free-space)
176.9
dB
Gaseous (O₂ + H₂O)
22.6
dB
Diffraction
157.5
dB
Rain attenuation
0.0
dB
Total path loss
356.9
dB
Gas rate 0.0633 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 7.8 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
-356.9
dB
RX antenna gain
30.0
dBi
RX power
-278.9
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-138.9
dB
Path weather · HRRR average of 9 samples
Temperature
80.2 °F
26.8 °C
Dewpoint
46.4 °F
8.0 °C
T/Td gap
33.8 °F
18.8 °C
Abs. humidity
7.8
g/m³
Pressure
976.1
mb
PWAT
15.6
mm
BL depth
2147.5
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
72/100
Rain
100
14%
Humidity
83
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
35.2, -93.6
26.6 °C
9.4 °C
999.2 mb
2119.4
16.9 mm
—
13%
34.9, -94.0
24.8 °C
10.0 °C
980.7 mb
1872.5
15.7 mm
—
25%
34.7, -94.4
24.1 °C
11.4 °C
976.1 mb
1426.3
15.1 mm
—
38%
34.4, -94.8
24.8 °C
11.2 °C
985.5 mb
1760.2
14.7 mm
—
Midpoint
34.1, -95.1
27.7 °C
8.0 °C
997.6 mb
2338.8
15.1 mm
—
63%
33.9, -95.5
29.0 °C
7.2 °C
1000.0 mb
2608.1
17.9 mm
—
75%
33.6, -95.9
27.4 °C
6.2 °C
994.4 mb
2332.2
14.9 mm
—
88%
33.4, -96.2
28.4 °C
4.9 °C
991.2 mb
2492.0
16.1 mm
—
Destination
33.1, -96.6
28.2 °C
3.9 °C
994.1 mb
2377.9
13.9 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 79
at 20:00 UTC
· low 68
at 08:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 79 | GOOD |
| 21:00 | 79 | GOOD |
| 22:00 | 79 | GOOD |
| 23:00 | 78 | GOOD |
| 00:00 | 78 | GOOD |
| 01:00 | 78 | GOOD |
| 02:00 | 79 | GOOD |
| 03:00 | 73 | GOOD |
| 04:00 | 71 | GOOD |
| 05:00 | 71 | GOOD |
| 06:00 | 71 | GOOD |
| 07:00 | 70 | GOOD |
| 08:00 | 68 | GOOD |
| 09:00 | 76 | GOOD |
| 10:00 | 77 | GOOD |
| 11:00 | 76 | GOOD |
| 12:00 · now | 76 | GOOD |