VOACAP HF Propagation Prediction

Point-to-point reliability prediction (NTIA/ITS VOACAP engine)

Year and Groups

Year

Month (1-12)

SSN (sunspot number)

Transmitter

Coordinates take the original program's notation - 33.48N, 81.95W - or a signed decimal (33.48, -81.95). Search VOACAP's own worldwide city database to fill them in; picked values stay editable.

Name

Find by city (optional)

Latitude (N/S)

Longitude (E/W)

Receiver

Name

Find by city (optional)

Latitude (N/S)

Longitude (E/W)

Antenna bearings are calculated from these coordinates unless you set them yourself under Tx Antenna and Rx Antenna below.

Path

Geometry

Distance and azimuth 1145km 618nmi 711mi Azimuth: 92.0deg

Freq (MHz) Frequencies, MHz (1-11 values, space or comma separated)

System

ManMade noise at 3 MHz (-dBW/Hz in 1 Hz bandwidth)

Minimum takeoff angle of main lobe (degrees)

Require circuit reliability (%)

Required S/N ratio (dB)

Multipath power tolerance (dB)

Maximum tolerable time delay (milliseconds)

Tx Antenna and Rx Antenna

Tx antenna

Rx antenna

MainBeam (deg) - blank aims at the receiver

Receiver Bearing (deg) - blank aims at the transmitter

Power (kW)

Reset to defaults