Distance
43.5
km · 27.0 mi
Bearing
149.1°
true · rev 329.1°
Terrain
BLOCKED
82.5 dB diffraction
Propagation
52/100
MARGINAL
Margin
-26.9
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 ≈ 19 m AGL at the midpoint (56 m above the chord, 28 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 8.3 m) clears with margin. The geometric line of sight is obstructed — buried 31 m below terrain at its worst point.
Great circle
33.525, -96.691 → 33.189, -96.452 · 149.1°
Loss budget · 47 GHz
FSPL (free-space)
158.6
dB
Gaseous (O₂ + H₂O)
3.7
dB
Diffraction
82.5
dB
Rain attenuation
0.0
dB
Total path loss
244.9
dB
Gas rate 0.0849 dB/km · H₂O 0.0030 dB/km/g · O₂ 0.0400 dB/km
Path abs. humidity avg 15.0 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
-244.9
dB
RX antenna gain
30.0
dBi
RX power
-166.9
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-26.9
dB
Path weather · HRRR average of 9 samples
Temperature
68.5 °F
20.3 °C
Dewpoint
63.9 °F
17.7 °C
T/Td gap
4.6 °F
2.6 °C
Abs. humidity
15.0
g/m³
Pressure
989.4
mb
PWAT
40.8
mm
BL depth
621.2
m AGL
Refrac. gradient
-67.6
N/km
Propagation factors · 47 GHz
52/100
Rain
100
14%
Humidity
31
13%
PWAT
15
11%
Season
55
11%
T-Td Depression
38
10%
Refractivity
55
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
33.5, -96.7
21.0 °C
17.2 °C
991.7 mb
-67.6
662.0
37.5 mm
—
13%
33.5, -96.7
20.3 °C
17.6 °C
989.4 mb
-62.7
611.2
41.1 mm
—
25%
33.4, -96.6
20.3 °C
17.6 °C
989.4 mb
-62.7
611.2
41.1 mm
—
38%
33.4, -96.6
20.0 °C
17.7 °C
994.3 mb
-57.8
583.6
39.8 mm
—
Midpoint
33.4, -96.6
20.0 °C
17.7 °C
994.3 mb
-57.8
583.6
39.8 mm
—
63%
33.3, -96.5
20.7 °C
17.8 °C
995.8 mb
-56.6
738.5
43.3 mm
—
75%
33.3, -96.5
20.1 °C
17.9 °C
997.2 mb
-58.9
600.2
41.5 mm
—
88%
33.2, -96.5
20.1 °C
17.9 °C
997.2 mb
-58.9
600.2
41.5 mm
—
Destination
33.2, -96.5
20.1 °C
17.9 °C
997.2 mb
-58.9
600.2
41.5 mm
—
Midpoint vertical profile
17-hour forecast · this path · 47 GHz
→ steady
Peak 62
at 13:00 UTC
· low 36
at 02:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 21:00 | 51 | MARGINAL |
| 22:00 | 47 | POOR |
| 23:00 | 52 | MARGINAL |
| 00:00 | 50 | MARGINAL |
| 01:00 | 46 | POOR |
| 02:00 | 36 | POOR |
| 03:00 | 47 | POOR |
| 04:00 | 53 | MARGINAL |
| 05:00 | 54 | MARGINAL |
| 06:00 | 58 | MARGINAL |
| 07:00 | 59 | MARGINAL |
| 08:00 | 57 | MARGINAL |
| 09:00 | 60 | MARGINAL |
| 10:00 | 61 | MARGINAL |
| 11:00 | 61 | MARGINAL |
| 12:00 | 61 | MARGINAL |
| 13:00 · now | 62 | MARGINAL |