Distance
173.2
km · 107.6 mi
Bearing
120.4°
true · rev 300.4°
Terrain
BLOCKED
116.3 dB diffraction
Propagation
78/100
GOOD
Margin
-56.7
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 ≈ 294 m AGL at the midpoint (883 m above the chord, 441 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 36.0 m) clears with margin. The geometric line of sight is obstructed — buried 493 m below terrain at its worst point.
Great circle
33.919, -98.219 → 33.12, -96.615 · 120.4°
Loss budget · 10 GHz
FSPL (free-space)
157.2
dB
Gaseous (O₂ + H₂O)
1.2
dB
Diffraction
116.3
dB
Rain attenuation
0.0
dB
Total path loss
274.7
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
-274.7
dB
RX antenna gain
30.0
dBi
RX power
-196.7
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-56.7
dB
Path weather · HRRR average of 9 samples
Temperature
72.6 °F
22.5 °C
Dewpoint
60.5 °F
15.8 °C
T/Td gap
12.1 °F
6.7 °C
Abs. humidity
13.2
g/m³
Pressure
967.1
mb
PWAT
26.2
mm
BL depth
303.1
m AGL
Refrac. gradient
-93.8
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
33.9, -98.2
21.7 °C
12.4 °C
975.2 mb
-76.0
296.3
25.7 mm
—
13%
33.8, -98.0
22.2 °C
14.8 °C
978.1 mb
-88.5
307.1
28.2 mm
—
25%
33.7, -97.8
22.9 °C
16.6 °C
976.8 mb
-93.8
319.1
29.3 mm
—
38%
33.6, -97.6
21.0 °C
17.3 °C
967.1 mb
-92.7
291.8
28.7 mm
—
Midpoint
33.5, -97.4
22.1 °C
17.6 °C
976.4 mb
-84.8
329.3
28.5 mm
—
63%
33.4, -97.2
22.1 °C
17.1 °C
982.5 mb
-90.2
320.8
26.4 mm
—
75%
33.3, -97.0
22.5 °C
15.6 °C
985.0 mb
-83.2
272.8
23.9 mm
—
88%
33.2, -96.8
24.1 °C
14.8 °C
988.5 mb
-59.0
323.9
23.2 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 | 78 | GOOD |
| 10:00 | 77 | GOOD |
| 11:00 | 77 | GOOD |
| 12:00 | 78 | GOOD |
| 13:00 | 78 | GOOD |
| 14:00 | 77 | GOOD |
| 15:00 | 77 | GOOD |
| 16:00 | 74 | GOOD |
| 17:00 | 76 | GOOD |
| 18:00 | 76 | GOOD |
| 19:00 | 79 | GOOD |
| 20:00 | 70 | GOOD |
| 21:00 | 66 | GOOD |
| 22:00 | 67 | GOOD |
| 23:00 | 72 | GOOD |
| 00:00 | 69 | GOOD |
| 01:00 · now | 72 | GOOD |