Distance
80.7
km · 50.1 mi
Bearing
25.8°
true · rev 205.8°
Terrain
BLOCKED
96.9 dB diffraction
Propagation
55/100
MARGINAL
Margin
-49.8
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 ≈ 64 m AGL at the midpoint (191 m above the chord, 96 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 11.3 m) clears with margin. The geometric line of sight is obstructed — buried 72 m below terrain at its worst point.
Great circle
32.468, -96.993 → 33.12, -96.615 · 25.8°
Loss budget · 47 GHz
FSPL (free-space)
164.0
dB
Gaseous (O₂ + H₂O)
6.9
dB
Diffraction
96.9
dB
Rain attenuation
0.0
dB
Total path loss
267.8
dB
Gas rate 0.0859 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 15.3 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
-267.8
dB
RX antenna gain
30.0
dBi
RX power
-189.8
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-49.8
dB
Path weather · HRRR average of 9 samples
Temperature
70.9 °F
21.6 °C
Dewpoint
64.6 °F
18.1 °C
T/Td gap
6.3 °F
3.5 °C
Abs. humidity
15.3
g/m³
Pressure
989.3
mb
PWAT
39.0
mm
BL depth
470.9
m AGL
Refrac. gradient
-76.4
N/km
Propagation factors · 47 GHz
55/100
Rain
100
14%
Humidity
29
13%
PWAT
35
11%
Season
55
11%
T-Td Depression
38
10%
Refractivity
62
10%
Pressure
82
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
18
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-10 21:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
32.5, -97.0
24.6 °C
18.7 °C
989.3 mb
-57.5
485.8
38.6 mm
—
13%
32.5, -96.9
24.6 °C
18.7 °C
989.3 mb
-57.5
485.8
38.6 mm
—
25%
32.6, -96.9
21.8 °C
18.8 °C
993.3 mb
-55.1
502.6
41.5 mm
—
38%
32.7, -96.9
22.4 °C
17.9 °C
997.1 mb
-59.1
505.2
38.6 mm
—
Midpoint
32.8, -96.8
21.9 °C
18.1 °C
1001.4 mb
-76.4
448.2
39.5 mm
—
63%
32.9, -96.8
20.7 °C
17.6 °C
998.3 mb
-73.4
433.5
37.3 mm
—
75%
33.0, -96.7
19.7 °C
17.5 °C
993.4 mb
-63.8
482.7
37.7 mm
—
88%
33.0, -96.7
19.7 °C
18.0 °C
998.0 mb
-71.9
438.2
38.7 mm
—
Destination
33.1, -96.6
19.4 °C
17.8 °C
995.0 mb
-62.2
456.2
40.3 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 63
at 13:00 UTC
· low 47
at 02:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 21:00 | 53 | MARGINAL |
| 22:00 | 50 | MARGINAL |
| 23:00 | 53 | MARGINAL |
| 00:00 | 53 | MARGINAL |
| 01:00 | 50 | MARGINAL |
| 02:00 | 47 | POOR |
| 03:00 | 50 | MARGINAL |
| 04:00 | 54 | MARGINAL |
| 05:00 | 54 | MARGINAL |
| 06:00 | 53 | MARGINAL |
| 07:00 | 54 | MARGINAL |
| 08:00 | 53 | MARGINAL |
| 09:00 | 54 | MARGINAL |
| 10:00 | 56 | MARGINAL |
| 11:00 | 56 | MARGINAL |
| 12:00 | 58 | MARGINAL |
| 13:00 · now | 63 | MARGINAL |