Distance
355.3
km · 220.8 mi
Bearing
231.1°
true · rev 51.1°
Terrain
BLOCKED
136.7 dB diffraction
Propagation
80/100
EXCELLENT
Margin
-84.7
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 ≈ 1238 m AGL at the midpoint (3715 m above the chord, 1857 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 51.6 m) clears with margin. The geometric line of sight is obstructed — buried 1541 m below terrain at its worst point.
Great circle
35.164, -93.648 → 33.12, -96.615 · 231.1°
Loss budget · 10 GHz
FSPL (free-space)
163.5
dB
Gaseous (O₂ + H₂O)
2.5
dB
Diffraction
136.7
dB
Rain attenuation
0.0
dB
Total path loss
302.7
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 12.8 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
-302.7
dB
RX antenna gain
30.0
dBi
RX power
-224.7
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-84.7
dB
Path weather · HRRR average of 9 samples
Temperature
67.6 °F
19.8 °C
Dewpoint
59.4 °F
15.2 °C
T/Td gap
8.3 °F
4.6 °C
Abs. humidity
12.8
g/m³
Pressure
973.0
mb
PWAT
23.9
mm
BL depth
260.6
m AGL
Refrac. gradient
-179.5
N/km · ducting
Propagation factors · 10 GHz
80/100
Rain
100
14%
Humidity
90
13%
PWAT
90
11%
Season
68
11%
T-Td Depression
85
10%
Refractivity
92
10%
Pressure
88
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
55
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-15 08:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
35.2, -93.6
19.1 °C
10.1 °C
996.7 mb
-82.7
333.7
24.7 mm
—
13%
34.9, -94.0
18.6 °C
13.3 °C
977.2 mb
-125.4
286.6
22.0 mm
—
25%
34.7, -94.4
17.2 °C
12.8 °C
973.0 mb
-145.4
333.7
23.8 mm
—
38%
34.4, -94.8
17.9 °C
15.4 °C
982.1 mb
-179.5
290.9
25.7 mm
—
Midpoint
34.1, -95.1
18.0 °C
16.2 °C
993.9 mb
-155.1
152.2
26.4 mm
—
63%
33.9, -95.5
19.4 °C
18.3 °C
995.7 mb
-173.6
186.1
25.7 mm
—
75%
33.6, -95.9
21.8 °C
17.1 °C
988.8 mb
-116.3
245.1
23.7 mm
—
88%
33.4, -96.2
22.1 °C
17.6 °C
985.5 mb
-148.6
250.6
21.7 mm
—
Destination
33.1, -96.6
24.1 °C
16.0 °C
987.4 mb
-91.5
266.6
22.0 mm
—
Midpoint vertical profile
18-hour forecast · this path · 10 GHz
→ steady
Peak 79
at 13:00 UTC
· low 67
at 00:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 77 | GOOD |
| 09:00 | 76 | GOOD |
| 10:00 | 75 | GOOD |
| 11:00 | 75 | GOOD |
| 12:00 | 77 | GOOD |
| 13:00 | 79 | GOOD |
| 14:00 | 78 | GOOD |
| 15:00 | 78 | GOOD |
| 16:00 | 75 | GOOD |
| 17:00 | 77 | GOOD |
| 18:00 | 75 | GOOD |
| 19:00 | 72 | GOOD |
| 20:00 | 72 | GOOD |
| 21:00 | 75 | GOOD |
| 22:00 | 71 | GOOD |
| 23:00 | 68 | GOOD |
| 00:00 | 67 | GOOD |
| 01:00 · now | 71 | GOOD |