Distance
160.8
km · 99.9 mi
Bearing
92.9°
true · rev 272.9°
Terrain
BLOCKED
132.8 dB diffraction
Propagation
72/100
GOOD
Margin
-94.6
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 ≈ 254 m AGL at the midpoint (761 m above the chord, 380 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 16.0 m) clears with margin. The geometric line of sight is obstructed — buried 420 m below terrain at its worst point.
Great circle
33.274, -98.178 → 33.189, -96.452 · 92.9°
Loss budget · 47 GHz
FSPL (free-space)
170.0
dB
Gaseous (O₂ + H₂O)
9.8
dB
Diffraction
132.8
dB
Rain attenuation
0.0
dB
Total path loss
312.6
dB
Gas rate 0.0611 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 7.0 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
-312.6
dB
RX antenna gain
30.0
dBi
RX power
-234.6
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-94.6
dB
Path weather · HRRR average of 9 samples
Temperature
80.3 °F
26.8 °C
Dewpoint
43.8 °F
6.5 °C
T/Td gap
36.5 °F
20.3 °C
Abs. humidity
7.0
g/m³
Pressure
981.0
mb
PWAT
14.1
mm
BL depth
2287.5
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
72/100
Rain
100
14%
Humidity
88
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%
33.3, -97.7
26.8 °C
6.5 °C
986.2 mb
2346.4
14.2 mm
—
38%
33.2, -97.5
26.1 °C
8.2 °C
985.2 mb
2288.1
15.2 mm
—
Midpoint
33.2, -97.3
25.1 °C
9.7 °C
988.2 mb
2268.4
15.0 mm
—
63%
33.2, -97.1
26.7 °C
6.5 °C
993.2 mb
2227.0
13.2 mm
—
75%
33.2, -96.9
27.7 °C
6.0 °C
995.5 mb
2360.1
15.5 mm
—
88%
33.2, -96.7
27.6 °C
4.7 °C
994.3 mb
2315.0
13.5 mm
—
Destination
33.2, -96.5
27.6 °C
4.8 °C
995.4 mb
2290.7
13.7 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 | 74 | 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 |