Distance
143.9
km · 89.4 mi
Bearing
121.2°
true · rev 301.2°
Terrain
BLOCKED
109.3 dB diffraction
Propagation
78/100
GOOD
Margin
-47.9
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 ≈ 203 m AGL at the midpoint (610 m above the chord, 305 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 32.9 m) clears with margin. The geometric line of sight is obstructed — buried 340 m below terrain at its worst point.
Great circle
33.798, -97.937 → 33.12, -96.615 · 121.2°
Loss budget · 10 GHz
FSPL (free-space)
155.6
dB
Gaseous (O₂ + H₂O)
1.0
dB
Diffraction
109.3
dB
Rain attenuation
0.0
dB
Total path loss
265.9
dB
Gas rate 0.0070 dB/km · H₂O 0.0000 dB/km/g · O₂ 0.0070 dB/km
Path abs. humidity avg 13.7 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
-265.9
dB
RX antenna gain
30.0
dBi
RX power
-187.9
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-47.9
dB
Path weather · HRRR average of 9 samples
Temperature
73.1 °F
22.8 °C
Dewpoint
61.5 °F
16.4 °C
T/Td gap
11.6 °F
6.4 °C
Abs. humidity
13.7
g/m³
Pressure
967.1
mb
PWAT
26.2
mm
BL depth
307.4
m AGL
Refrac. gradient
-96.7
N/km
Propagation factors · 10 GHz
78/100
Rain
100
14%
Humidity
90
13%
PWAT
90
11%
Season
68
11%
T-Td Depression
85
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
33.8, -97.9
22.9 °C
16.6 °C
976.8 mb
-93.8
319.1
29.3 mm
—
13%
33.7, -97.8
23.2 °C
17.1 °C
975.8 mb
-96.7
322.1
29.3 mm
—
25%
33.6, -97.6
21.0 °C
17.3 °C
967.1 mb
-92.7
291.8
28.7 mm
—
38%
33.5, -97.4
21.9 °C
17.1 °C
975.1 mb
-87.1
309.1
28.2 mm
—
Midpoint
33.5, -97.3
21.9 °C
17.4 °C
979.1 mb
-81.7
325.4
27.5 mm
—
63%
33.4, -97.1
23.3 °C
16.3 °C
985.6 mb
-85.8
353.9
25.3 mm
—
75%
33.3, -96.9
23.2 °C
14.8 °C
987.3 mb
-64.6
296.8
23.3 mm
—
88%
33.2, -96.8
24.1 °C
14.8 °C
985.1 mb
-64.2
282.1
21.9 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 84
at 08:00 UTC
· low 66
at 21:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 84 | EXCELLENT |
| 09:00 | 75 | GOOD |
| 10:00 | 77 | GOOD |
| 11:00 | 77 | GOOD |
| 12:00 | 76 | GOOD |
| 13:00 | 75 | GOOD |
| 14:00 | 75 | GOOD |
| 15:00 | 76 | GOOD |
| 16:00 | 74 | GOOD |
| 17:00 | 74 | GOOD |
| 18:00 | 74 | GOOD |
| 19:00 | 78 | GOOD |
| 20:00 | 69 | GOOD |
| 21:00 | 66 | GOOD |
| 22:00 | 68 | GOOD |
| 23:00 | 68 | GOOD |
| 00:00 | 70 | GOOD |
| 01:00 · now | 74 | GOOD |