Distance
55.9
km · 34.7 mi
Bearing
57.3°
true · rev 237.3°
Terrain
BLOCKED
108.8 dB diffraction
Propagation
54/100
MARGINAL
Margin
-56.3
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 ≈ 31 m AGL at the midpoint (92 m above the chord, 46 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 9.4 m) clears with margin. The geometric line of sight is obstructed — buried 99 m below terrain at its worst point.
Great circle
32.919, -96.957 → 33.189, -96.452 · 57.3°
Loss budget · 47 GHz
FSPL (free-space)
160.8
dB
Gaseous (O₂ + H₂O)
4.8
dB
Diffraction
108.8
dB
Rain attenuation
0.0
dB
Total path loss
274.3
dB
Gas rate 0.0852 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
-274.3
dB
RX antenna gain
30.0
dBi
RX power
-196.3
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-56.3
dB
Path weather · HRRR average of 9 samples
Temperature
68.4 °F
20.2 °C
Dewpoint
64.0 °F
17.8 °C
T/Td gap
4.4 °F
2.4 °C
Abs. humidity
15.0
g/m³
Pressure
993.4
mb
PWAT
39.6
mm
BL depth
523.5
m AGL
Refrac. gradient
-77.9
N/km
Propagation factors · 47 GHz
54/100
Rain
100
14%
Humidity
31
13%
PWAT
35
11%
Season
55
11%
T-Td Depression
38
10%
Refractivity
62
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, -97.0
23.3 °C
17.6 °C
997.2 mb
-77.9
606.7
39.1 mm
—
13%
33.0, -96.9
20.7 °C
18.0 °C
995.4 mb
-63.4
597.5
39.5 mm
—
25%
33.0, -96.8
20.7 °C
18.0 °C
995.4 mb
-63.4
597.5
39.5 mm
—
38%
33.0, -96.8
19.7 °C
17.5 °C
993.4 mb
-63.8
482.7
37.7 mm
—
Midpoint
33.1, -96.7
19.7 °C
17.5 °C
993.4 mb
-63.8
482.7
37.7 mm
—
63%
33.1, -96.6
19.4 °C
17.8 °C
995.0 mb
-62.2
456.2
40.3 mm
—
75%
33.1, -96.6
19.4 °C
17.8 °C
995.0 mb
-62.2
456.2
40.3 mm
—
88%
33.2, -96.5
18.9 °C
17.8 °C
998.4 mb
-65.0
431.7
40.8 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 63
at 12:00 UTC
· low 45
at 02:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 21:00 | 49 | POOR |
| 22:00 | 51 | MARGINAL |
| 23:00 | 50 | MARGINAL |
| 00:00 | 50 | MARGINAL |
| 01:00 | 51 | MARGINAL |
| 02:00 | 45 | POOR |
| 03:00 | 48 | POOR |
| 04:00 | 54 | MARGINAL |
| 05:00 | 55 | MARGINAL |
| 06:00 | 55 | MARGINAL |
| 07:00 | 56 | MARGINAL |
| 08:00 | 56 | MARGINAL |
| 09:00 | 56 | MARGINAL |
| 10:00 | 58 | MARGINAL |
| 11:00 | 57 | MARGINAL |
| 12:00 | 63 | MARGINAL |
| 13:00 · now | 63 | MARGINAL |