Distance
221.9
km · 137.9 mi
Bearing
94.0°
true · rev 274.0°
Terrain
BLOCKED
123.4 dB diffraction
Propagation
76/100
GOOD
Margin
-66.3
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 ≈ 483 m AGL at the midpoint (1449 m above the chord, 725 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 40.8 m) clears with margin. The geometric line of sight is obstructed — buried 747 m below terrain at its worst point.
Great circle
33.282, -98.993 → 33.12, -96.615 · 94.0°
Loss budget · 10 GHz
FSPL (free-space)
159.4
dB
Gaseous (O₂ + H₂O)
1.6
dB
Diffraction
123.4
dB
Rain attenuation
0.0
dB
Total path loss
284.3
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 12.4 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
-284.3
dB
RX antenna gain
30.0
dBi
RX power
-206.3
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-66.3
dB
Path weather · HRRR average of 9 samples
Temperature
74.1 °F
23.4 °C
Dewpoint
59.0 °F
15.0 °C
T/Td gap
15.1 °F
8.4 °C
Abs. humidity
12.4
g/m³
Pressure
964.3
mb
PWAT
26.2
mm
BL depth
290.5
m AGL
Refrac. gradient
-92.6
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
33.3, -99.0
25.0 °C
13.6 °C
966.3 mb
-80.9
301.6
26.9 mm
—
13%
33.3, -98.7
25.3 °C
13.0 °C
965.5 mb
-92.6
310.5
27.0 mm
—
25%
33.2, -98.4
23.7 °C
12.5 °C
964.3 mb
-66.3
326.6
25.8 mm
—
38%
33.2, -98.1
22.8 °C
14.0 °C
973.5 mb
-70.3
259.2
29.0 mm
—
Midpoint
33.2, -97.8
22.4 °C
17.0 °C
979.0 mb
-73.2
342.1
30.2 mm
—
63%
33.2, -97.5
22.2 °C
16.9 °C
976.3 mb
-89.7
269.4
27.0 mm
—
75%
33.2, -97.2
21.3 °C
16.7 °C
983.4 mb
-85.7
259.1
24.9 mm
—
88%
33.1, -96.9
23.5 °C
15.0 °C
988.3 mb
-69.0
279.1
22.7 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 20:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 75 | GOOD |
| 09:00 | 78 | GOOD |
| 10:00 | 76 | GOOD |
| 11:00 | 77 | GOOD |
| 12:00 | 77 | GOOD |
| 13:00 | 79 | GOOD |
| 14:00 | 77 | GOOD |
| 15:00 | 75 | GOOD |
| 16:00 | 74 | GOOD |
| 17:00 | 79 | GOOD |
| 18:00 | 79 | GOOD |
| 19:00 | 75 | GOOD |
| 20:00 | 67 | GOOD |
| 21:00 | 68 | GOOD |
| 22:00 | 67 | GOOD |
| 23:00 | 67 | GOOD |
| 00:00 | 73 | GOOD |
| 01:00 · now | 75 | GOOD |