Distance
28.2
km · 17.5 mi
Bearing
332.8°
true · rev 152.8°
Terrain
BLOCKED
22.5 dB diffraction
Propagation
51/100
MARGINAL
Margin
+38.2
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 ≈ 8 m AGL at the midpoint (23 m above the chord, 12 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 6.7 m) clears with margin. The geometric line of sight is obstructed — buried 1 m below terrain at its worst point.
Great circle
32.894, -96.477 → 33.12, -96.615 · 332.8°
Loss budget · 47 GHz
FSPL (free-space)
154.9
dB
Gaseous (O₂ + H₂O)
2.4
dB
Diffraction
22.5
dB
Rain attenuation
0.0
dB
Total path loss
179.8
dB
Gas rate 0.0855 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 15.1 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
-179.8
dB
RX antenna gain
30.0
dBi
RX power
-101.8
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
38.2
dB
Path weather · HRRR average of 9 samples
Temperature
67.0 °F
19.4 °C
Dewpoint
64.1 °F
17.8 °C
T/Td gap
2.9 °F
1.6 °C
Abs. humidity
15.1
g/m³
Pressure
995.0
mb
PWAT
39.9
mm
BL depth
440.8
m AGL
Refrac. gradient
-71.9
N/km
Propagation factors · 47 GHz
51/100
Rain
100
14%
Humidity
30
13%
PWAT
35
11%
Season
55
11%
T-Td Depression
18
10%
Refractivity
55
10%
Pressure
70
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
32.9, -96.5
20.1 °C
17.9 °C
1001.5 mb
-62.8
429.9
39.2 mm
—
13%
32.9, -96.5
20.1 °C
17.9 °C
1001.5 mb
-62.8
429.9
39.2 mm
—
25%
33.0, -96.5
18.9 °C
17.7 °C
999.8 mb
-67.9
433.5
40.5 mm
—
38%
33.0, -96.5
18.9 °C
17.7 °C
999.8 mb
-67.9
433.5
40.5 mm
—
Midpoint
33.0, -96.5
18.9 °C
17.7 °C
999.8 mb
-67.9
433.5
40.5 mm
—
63%
33.0, -96.6
19.7 °C
18.0 °C
998.0 mb
-71.9
438.2
38.7 mm
—
75%
33.1, -96.6
19.4 °C
17.8 °C
995.0 mb
-62.2
456.2
40.3 mm
—
88%
33.1, -96.6
19.4 °C
17.8 °C
995.0 mb
-62.2
456.2
40.3 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 62
at 13:00 UTC
· low 40
at 21:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 21:00 | 40 | POOR |
| 22:00 | 47 | POOR |
| 23:00 | 51 | MARGINAL |
| 00:00 | 49 | POOR |
| 01:00 | 52 | MARGINAL |
| 02:00 | 44 | POOR |
| 03:00 | 41 | POOR |
| 04:00 | 52 | MARGINAL |
| 05:00 | 52 | MARGINAL |
| 06:00 | 53 | MARGINAL |
| 07:00 | 54 | MARGINAL |
| 08:00 | 53 | MARGINAL |
| 09:00 | 54 | MARGINAL |
| 10:00 | 56 | MARGINAL |
| 11:00 | 55 | MARGINAL |
| 12:00 | 56 | MARGINAL |
| 13:00 · now | 62 | MARGINAL |