VOACAP Online



TX to RX:  km,  mi,  ° Year:   Month:  
Propagation Params
Es:  Model:
SSN:  Min.TOA: °
Today's Sunrise/Sunset Times (UTC)
 TransmitterReceiver
 RiseSetRiseSet
GND
D
F
Transmitter Site
QTH:
Name:
Latitude:[-90..90]
Longitude:[-180..180]
TX antenna:
TX power:
TX mode:  
Specials:
Current point:
Receiver Site
QTH:
Name:
Latitude:[-90..90]
Longitude:[-180..180]
RX antenna:

The circular chart above shows predictions for all HF amateur radio bands. Hover the mouse over the chart for details. For predictions with more frequency coverage, click the "Run prediction!" button.
Online Help

NEW! VOACAP Oнлайн: Прогноза прохождения для частот 3-30 МГц

Instructions:

  • VOACAP Online knows about the correct SSN values. Therefore DO NOT set any value to SSN, unless you want to experiment. After you have entered a value in any of the fields, press the TAB key instead of ENTER.
  • If in doubt, read the User Manual and about new features.
  • Transmitter Site (TX) = Your Station (red) and Receiver Site (RX) = DX Station (blue). Drag the markers on the map to the desired locations. Double-click the markers to swap TX and RX.
  • The red line between the markers shows the great-cirle path (short-path). You can also choose long-path. Zoom the map in/out with the mouse wheel.
  • Choose the year & month, TX and RX antennas and TX power.

More on VOACAP HF propagation predictions

Acknowledgements

This service would not have been possible without the support of two special people: Mr George Lane and Mr Greg Hand. Thank you!

© 2010-14 Jari Perkiömäki (OH6BG), James Watson (HZ1JW) and Juho Juopperi (OH8GLV). Questions or suggestions? Write to our Helpdesk.