To RX:  km,  mi,  °  Grayline:    :   
Propagation Params
Es:  Model:
SSN:  Min.TOA: °
Today's Sunrise/Sunset Times (UTC)
 TransmitterReceiver
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:
Noise level:

Use the new VOACAP P2P Prediction Charts

Online Help

RUSSIAN: VOACAP Oнлайн: Прогноза прохождения для частот 3-30 МГц

Instructions:
The 24-hour circular wheel above shows predictions for all HF amateur radio bands. Hover the mouse over the wheel for prediction details. For more advanced predictions, click on the "All-year grayline", "All-year prediction", or "1-month prediction" button.

  • VOACAP Online knows the predicted monthly SSN values. Therefore DO NOT set any value for 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 (May 1, 2017 Edition).
  • 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 circle along the short-path/long-path great-circle line shows the half-way point between the Transmitter site and the Receiver site.
  • 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!

© 2010-2017 Jari Perkiömäki (OH6BG), James Watson (HZ1JW) and Juho Juopperi (OH8GLV). Questions or suggestions? Write to our Helpdesk.