Distance
20.5
km · 12.8 mi
Bearing
283.8°
true · rev 103.8°
Terrain
BLOCKED
85.8 dB diffraction
Propagation
71/100
GOOD
Margin
-21.2
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 ≈ 4 m AGL at the midpoint (12 m above the chord, 6 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 5.7 m) clears with margin. The geometric line of sight is obstructed — buried 30 m below terrain at its worst point.
Great circle
33.145, -96.238 → 33.189, -96.452 · 283.8°
Loss budget · 47 GHz
FSPL (free-space)
152.1
dB
Gaseous (O₂ + H₂O)
1.3
dB
Diffraction
85.8
dB
Rain attenuation
0.0
dB
Total path loss
239.2
dB
Gas rate 0.0634 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 7.8 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
-239.2
dB
RX antenna gain
30.0
dBi
RX power
-161.2
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-21.2
dB
Path weather · HRRR average of 9 samples
Temperature
79.0 °F
26.1 °C
Dewpoint
46.5 °F
8.1 °C
T/Td gap
32.5 °F
18.0 °C
Abs. humidity
7.8
g/m³
Pressure
995.4
mb
PWAT
14.4
mm
BL depth
2223.3
m AGL
Refrac. gradient
0
N/km
Propagation factors · 47 GHz
71/100
Rain
100
14%
Humidity
83
13%
PWAT
80
11%
Season
55
11%
T-Td Depression
96
10%
Refractivity
50
10%
Pressure
70
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
33.1, -96.2
26.3 °C
7.7 °C
996.2 mb
2198.8
13.8 mm
—
13%
33.2, -96.3
26.3 °C
7.7 °C
996.2 mb
2198.8
13.8 mm
—
25%
33.2, -96.3
26.3 °C
7.7 °C
996.2 mb
2198.8
13.8 mm
—
38%
33.2, -96.3
25.7 °C
9.1 °C
996.9 mb
2206.6
14.9 mm
—
Midpoint
33.2, -96.3
25.7 °C
9.1 °C
996.9 mb
2206.6
14.9 mm
—
63%
33.2, -96.4
25.7 °C
9.1 °C
996.9 mb
2206.6
14.9 mm
—
75%
33.2, -96.4
25.7 °C
9.1 °C
996.9 mb
2206.6
14.9 mm
—
88%
33.2, -96.4
25.7 °C
9.1 °C
996.9 mb
2206.6
14.9 mm
—
Destination
33.2, -96.5
27.8 °C
4.1 °C
995.4 mb
2379.9
13.3 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 78
at 22:00 UTC
· low 62
at 12:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 20:00 | 76 | GOOD |
| 21:00 | 77 | GOOD |
| 22:00 | 78 | GOOD |
| 23:00 | 77 | GOOD |
| 00:00 | 77 | GOOD |
| 01:00 | 75 | GOOD |
| 02:00 | 73 | GOOD |
| 03:00 | 75 | GOOD |
| 04:00 | 73 | GOOD |
| 05:00 | 74 | GOOD |
| 06:00 | 73 | GOOD |
| 07:00 | 74 | GOOD |
| 08:00 | 74 | GOOD |
| 09:00 | 73 | GOOD |
| 10:00 | 74 | GOOD |
| 11:00 | 74 | GOOD |
| 12:00 · now | 62 | MARGINAL |