Distance
244.2
km · 151.7 mi
Bearing
100.6°
true · rev 280.6°
Terrain
BLOCKED
125.9 dB diffraction
Propagation
76/100
GOOD
Margin
-69.8
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 ≈ 585 m AGL at the midpoint (1755 m above the chord, 877 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 42.8 m) clears with margin. The geometric line of sight is obstructed — buried 870 m below terrain at its worst point.
Great circle
33.55, -99.193 → 33.12, -96.615 · 100.6°
Loss budget · 10 GHz
FSPL (free-space)
160.2
dB
Gaseous (O₂ + H₂O)
1.7
dB
Diffraction
125.9
dB
Rain attenuation
0.0
dB
Total path loss
287.8
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 11.7 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
-287.8
dB
RX antenna gain
30.0
dBi
RX power
-209.8
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-69.8
dB
Path weather · HRRR average of 9 samples
Temperature
74.8 °F
23.8 °C
Dewpoint
57.4 °F
14.1 °C
T/Td gap
17.4 °F
9.7 °C
Abs. humidity
11.7
g/m³
Pressure
961.0
mb
PWAT
25.5
mm
BL depth
299.9
m AGL
Refrac. gradient
-96.1
N/km
Propagation factors · 10 GHz
76/100
Rain
100
14%
Humidity
90
13%
PWAT
90
11%
Season
68
11%
T-Td Depression
70
10%
Refractivity
68
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
33.6, -99.2
26.0 °C
9.1 °C
961.0 mb
-42.8
281.3
25.4 mm
—
13%
33.5, -98.9
26.2 °C
9.1 °C
963.2 mb
-53.4
281.6
23.5 mm
—
25%
33.4, -98.5
24.9 °C
12.1 °C
967.3 mb
-86.7
325.8
23.3 mm
—
38%
33.4, -98.2
22.8 °C
12.6 °C
972.5 mb
-52.4
309.9
27.3 mm
—
Midpoint
33.3, -97.9
22.9 °C
16.6 °C
972.5 mb
-88.0
332.9
30.2 mm
—
63%
33.3, -97.6
21.8 °C
17.1 °C
977.7 mb
-77.9
314.6
28.5 mm
—
75%
33.2, -97.3
22.0 °C
17.0 °C
984.4 mb
-96.1
313.6
25.7 mm
—
88%
33.2, -96.9
23.5 °C
17.3 °C
990.4 mb
-59.5
272.6
23.5 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 78
at 12:00 UTC
· low 64
at 20:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 74 | GOOD |
| 09:00 | 75 | GOOD |
| 10:00 | 74 | GOOD |
| 11:00 | 75 | GOOD |
| 12:00 | 78 | GOOD |
| 13:00 | 76 | GOOD |
| 14:00 | 77 | GOOD |
| 15:00 | 75 | GOOD |
| 16:00 | 74 | GOOD |
| 17:00 | 74 | GOOD |
| 18:00 | 77 | GOOD |
| 19:00 | 70 | GOOD |
| 20:00 | 64 | MARGINAL |
| 21:00 | 65 | GOOD |
| 22:00 | 64 | MARGINAL |
| 23:00 | 65 | GOOD |
| 00:00 | 71 | GOOD |
| 01:00 · now | 69 | GOOD |