Distance
76.4
km · 47.5 mi
Bearing
123.1°
true · rev 303.1°
Terrain
BLOCKED
90.5 dB diffraction
Propagation
62/100
MARGINAL
Margin
-33.7
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 ≈ 57 m AGL at the midpoint (172 m above the chord, 86 m above the 4/3 horizon), so its Fresnel zone (F₁ ≈ 15.5 m) clears with margin. The geometric line of sight is obstructed — buried 70 m below terrain at its worst point.
Great circle
33.497, -97.303 → 33.12, -96.615 · 123.1°
Loss budget · 24 GHz
FSPL (free-space)
157.7
dB
Gaseous (O₂ + H₂O)
3.5
dB
Diffraction
90.5
dB
Rain attenuation
0.0
dB
Total path loss
251.7
dB
Gas rate 0.0462 dB/km · H₂O 0.0020 dB/km/g · O₂ 0.0200 dB/km
Path abs. humidity avg 13.1 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
-251.7
dB
RX antenna gain
30.0
dBi
RX power
-173.7
dBm
Sensitivity (CW, 500 Hz)
-141.0
dBm
Margin
-33.7
dB
Path weather · HRRR average of 9 samples
Temperature
73.7 °F
23.2 °C
Dewpoint
60.4 °F
15.8 °C
T/Td gap
13.3 °F
7.4 °C
Abs. humidity
13.1
g/m³
Pressure
979.1
mb
PWAT
24.1
mm
BL depth
303.4
m AGL
Refrac. gradient
-91.5
N/km
Propagation factors · 24 GHz
62/100
Rain
100
14%
Humidity
4
13%
PWAT
60
11%
Season
47
11%
T-Td Depression
60
10%
Refractivity
62
10%
Pressure
88
10%
Sky Cover
50
8%
Wind
50
8%
Time of Day
55
4%
Atmospheric profile
HRRR 3 km
Valid 2026-05-15 08:00 UTC
· 9 samples
Point
Lat, lon
Temp
Dewpt
Press
dN/dh
BL m
PWAT
Duct
Source
33.5, -97.3
21.9 °C
17.4 °C
979.1 mb
-81.7
325.4
27.5 mm
—
13%
33.4, -97.2
21.9 °C
17.4 °C
979.1 mb
-81.7
325.4
27.5 mm
—
25%
33.4, -97.1
23.3 °C
16.3 °C
985.6 mb
-85.8
353.9
25.3 mm
—
38%
33.4, -97.0
22.5 °C
15.6 °C
985.0 mb
-83.2
272.8
23.9 mm
—
Midpoint
33.3, -97.0
23.2 °C
14.8 °C
987.3 mb
-64.6
296.8
23.3 mm
—
63%
33.3, -96.9
24.1 °C
14.8 °C
988.5 mb
-59.0
323.9
23.2 mm
—
75%
33.2, -96.8
24.1 °C
14.8 °C
985.1 mb
-64.2
282.1
21.9 mm
—
88%
33.2, -96.7
23.6 °C
14.9 °C
985.3 mb
-68.1
283.7
22.0 mm
—
Destination
33.1, -96.6
24.1 °C
16.0 °C
987.4 mb
-91.5
266.6
22.0 mm
—
Midpoint vertical profile
18-hour forecast · this path · 24 GHz
→ steady
Peak 64
at 08:00 UTC
· low 50
at 01:00 UTC
| Hour UTC | Score | Rating |
|---|---|---|
| 08:00 | 64 | MARGINAL |
| 09:00 | 61 | MARGINAL |
| 10:00 | 61 | MARGINAL |
| 11:00 | 58 | MARGINAL |
| 12:00 | 59 | MARGINAL |
| 13:00 | 60 | MARGINAL |
| 14:00 | 63 | MARGINAL |
| 15:00 | 62 | MARGINAL |
| 16:00 | 64 | MARGINAL |
| 17:00 | 64 | MARGINAL |
| 18:00 | 60 | MARGINAL |
| 19:00 | 62 | MARGINAL |
| 20:00 | 63 | MARGINAL |
| 21:00 | 58 | MARGINAL |
| 22:00 | 60 | MARGINAL |
| 23:00 | 54 | MARGINAL |
| 00:00 | 54 | MARGINAL |
| 01:00 · now | 50 | MARGINAL |