Distance
337.0
km · 209.4 mi
Bearing
242.4°
true · rev 62.4°
Terrain
BLOCKED
136.6 dB diffraction
Propagation
79/100
GOOD
Margin
-83.9
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 ≈ 1114 m AGL at the midpoint (3342 m above the chord, 1671 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 50.3 m) clears with margin. The geometric line of sight is obstructed — buried 1511 m below terrain at its worst point.
Great circle
34.564, -93.407 → 33.12, -96.615 · 242.4°
Loss budget · 10 GHz
FSPL (free-space)
163.0
dB
Gaseous (O₂ + H₂O)
2.4
dB
Diffraction
136.6
dB
Rain attenuation
0.0
dB
Total path loss
301.9
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 13.2 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
-301.9
dB
RX antenna gain
30.0
dBi
RX power
-223.9
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-83.9
dB
Path weather · HRRR average of 9 samples
Temperature
67.9 °F
19.9 °C
Dewpoint
60.2 °F
15.6 °C
T/Td gap
7.7 °F
4.3 °C
Abs. humidity
13.2
g/m³
Pressure
980.2
mb
PWAT
24.7
mm
BL depth
175.9
m AGL
Refrac. gradient
-226.1
N/km · ducting
Propagation factors · 10 GHz
79/100
Rain
100
14%
Humidity
90
13%
PWAT
90
11%
Season
68
11%
T-Td Depression
75
10%
Refractivity
98
10%
Pressure
82
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
34.6, -93.4
17.7 °C
13.0 °C
991.4 mb
-116.4
166.2
25.0 mm
—
13%
34.4, -93.8
18.9 °C
11.8 °C
980.2 mb
-130.0
271.1
23.0 mm
—
25%
34.2, -94.2
17.5 °C
13.5 °C
988.7 mb
-148.3
71.8
26.4 mm
—
38%
34.0, -94.6
19.0 °C
15.6 °C
999.3 mb
-226.1
75.0
28.2 mm
—
Midpoint
33.8, -95.0
19.4 °C
17.6 °C
998.6 mb
-144.8
131.8
26.7 mm
—
63%
33.7, -95.4
19.5 °C
18.6 °C
992.7 mb
-146.2
189.0
24.5 mm
—
75%
33.5, -95.8
21.3 °C
17.1 °C
991.0 mb
-127.9
182.8
25.0 mm
—
88%
33.3, -96.2
22.0 °C
17.5 °C
986.9 mb
-123.7
228.7
21.5 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 68
at 22:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 77 | GOOD |
| 09:00 | 73 | GOOD |
| 10:00 | 75 | GOOD |
| 11:00 | 75 | GOOD |
| 12:00 | 76 | GOOD |
| 13:00 | 79 | GOOD |
| 14:00 | 79 | GOOD |
| 15:00 | 78 | GOOD |
| 16:00 | 75 | GOOD |
| 17:00 | 74 | GOOD |
| 18:00 | 72 | GOOD |
| 19:00 | 72 | GOOD |
| 20:00 | 72 | GOOD |
| 21:00 | 69 | GOOD |
| 22:00 | 68 | GOOD |
| 23:00 | 68 | GOOD |
| 00:00 | 69 | GOOD |
| 01:00 · now | 70 | GOOD |