Distance
146.4
km · 90.9 mi
Bearing
96.3°
true · rev 276.3°
Terrain
BLOCKED
129.6 dB diffraction
Propagation
72/100
GOOD
Margin
-90.1
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 ≈ 210 m AGL at the midpoint (630 m above the chord, 315 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 15.3 m) clears with margin. The geometric line of sight is obstructed — buried 352 m below terrain at its worst point.
Great circle
33.274, -98.178 → 33.12, -96.615 · 96.3°
Loss budget · 47 GHz
FSPL (free-space)
169.2
dB
Gaseous (O₂ + H₂O)
9.2
dB
Diffraction
129.6
dB
Rain attenuation
0.0
dB
Total path loss
308.1
dB
Gas rate 0.0630 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 7.7 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
-308.1
dB
RX antenna gain
30.0
dBi
RX power
-230.1
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-90.1
dB
Path weather · HRRR average of 9 samples
Temperature
79.3 °F
26.3 °C
Dewpoint
46.1 °F
7.8 °C
T/Td gap
33.3 °F
18.5 °C
Abs. humidity
7.7
g/m³
Pressure
981.0
mb
PWAT
15.1
mm
BL depth
2319.6
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
72/100
Rain
100
14%
Humidity
84
13%
PWAT
80
11%
Season
55
11%
T-Td Depression
96
10%
Refractivity
50
10%
Pressure
82
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
18
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-03 20:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
33.3, -98.2
26.9 °C
6.3 °C
981.0 mb
2234.4
13.1 mm
—
13%
33.3, -98.0
26.9 °C
6.3 °C
982.5 mb
2257.7
13.3 mm
—
25%
33.2, -97.8
26.8 °C
6.5 °C
986.2 mb
2346.4
14.2 mm
—
38%
33.2, -97.6
26.1 °C
6.8 °C
984.9 mb
2316.1
13.8 mm
—
Midpoint
33.2, -97.4
25.1 °C
9.7 °C
988.2 mb
2268.4
15.0 mm
—
63%
33.2, -97.2
25.1 °C
10.8 °C
990.8 mb
2275.6
16.2 mm
—
75%
33.2, -97.0
24.6 °C
10.8 °C
997.5 mb
2389.3
16.5 mm
—
88%
33.1, -96.8
27.0 °C
6.8 °C
992.1 mb
2289.3
16.2 mm
—
Destination
33.1, -96.6
28.4 °C
6.3 °C
993.9 mb
2499.5
17.5 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 80
at 21:00 UTC
· low 63
at 12:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 78 | GOOD |
| 21:00 | 80 | EXCELLENT |
| 22:00 | 77 | GOOD |
| 23:00 | 75 | GOOD |
| 00:00 | 74 | GOOD |
| 01:00 | 72 | GOOD |
| 02:00 | 73 | GOOD |
| 03:00 | 76 | GOOD |
| 04:00 | 74 | GOOD |
| 05:00 | 74 | GOOD |
| 06:00 | 74 | GOOD |
| 07:00 | 75 | GOOD |
| 08:00 | 74 | GOOD |
| 09:00 | 74 | GOOD |
| 10:00 | 75 | GOOD |
| 11:00 | 67 | GOOD |
| 12:00 · now | 63 | MARGINAL |