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80 Meters to

10 Meters. Choosing a correct antenna is one of things that contribute to a good prediction. There is a wide selection of antennas (verticals, dipoles, yagis and an isotrope) to choose from: 1/4 wl Vertical 5/8 wl Vertical 3/2 wl Vertical Dipole @ 10M (33ft) Dipole @ 15M (50ft) Dipole @ 20M (66ft) Dipole @ 25M (82ft) Dipole @ 30M (99ft) Dipole @ 40M (132ft) Dipole @ 60M (198ft) 3-el Yagi @ 10M (33ft) 3-el Yagi @ 15M (50ft) 3-el Yagi @ 20M (66ft) 3-el Yagi @ 25M (82ft) 3-el Yagi @ 30M (99ft) 3-el Yagi @ 40M (132ft) 3-el Yagi @ 60M (198ft) 5-el Yagi @ 10M (33ft) 5-el Yagi @ 15M (50ft) 5-el Yagi @ 20M (66ft) 5-el Yagi @ 25M (82ft) 5-el Yagi @ 30M (99ft) 5-el Yagi @ 40M (132ft) 5-el Yagi @ 60M (198ft) 8-el Yagi @ 10M (33ft) 8-el Yagi @ 15M (50ft) 8-el Yagi @ 20M (66ft) 8-el Yagi @ 25M (82ft) 8-el Yagi @ 30M (99ft) 8-el Yagi @ 40M (132ft) 8-el Yagi @ 60M (198ft) Isotrope (12 dBi gain)

10 M 4x JP2000 If you wish to see VOACAP'

s view of all potential openings, choose the 12-dBi isotrope (transmit and receive) antenna for all bands. The 12-dBi gain is valid for elevation angles VOACAP Propagation Planner Page

4 from

0 to

90 degrees. Typically, you would choose the antenna types which are the closest match to the antennas you really use. This will bring the prediction closer to the reality . The transmitting power can be selected from eight pre-defined values between 1-1,500 watts. The transmitting modes available are CW (Morse), SSB (Single-Side Band, Phone) and AM (Amplitude Modulation). The selection of the transmitting mode sets the reference for VOACAP'

s Reliability (REL) calculations. The REL output value is one of the parameters which we will consider as we work on and interpret the VOACAP prediction. In the Ionospheric Parameters section you can choose if you want to consider the effects of a possible Es layer. Setting this to Yes can be useful for summer-time predictions. The default value is No . In the DX Site Settings section you will need to choose the antennas of the receiving (DX) site for each band from

80 Meters to

10 Meters. Of course, if you make predictions for a DXpedition, the coordinates of the DXpedition site will be entered in the TX Site section, and the rest of the world is considered to be the DX sites . The antenna selection is the same as in the TX Site section. In reality, you cannot possible enter all the possible antennas the DX stations may have but you must choose an appropriate reference antenna , e.g. a 3-element Yagi at

15 meters (50 feet) above the ground. Then you must select a collection of pre-defined receiving sites, i.e. the DX Sites . There are two identical collections available (one for Short-Path and the other one for Long-Path predictions) that extensively cover all the

40 CQ Zones around the world. Each collection contains

54 receive sites. As we know, some CQ Zones, for instance the Zones

14 and 15, are geographically large and only one location per Zone cannot represent that Zone well enough. VOACAP Propagation Planner Page

5 Image 2. The countries included in the DX Site collection (the Zone number and DXCC country shown above). When you are done with the input values, it'

s time for VOACAP to calculate the prediction from the transmitting (TX) site to all the receive (DX) sites in the DX Site collection. This means

54 point-to-point calculations per collection. More collections can be created if necessary. Please contact the author. Now you can finally press the Run the prediction button, and wait for a few seconds as the result page comes up. VOACAP Propagation Planner Page