FAQ - Part 2

Prediction Types

What IS a Prediction?

A Prediction contains the information telling K6TU.NET what prediction to run and what output to generate. The basics of a prediction include:

  • The Location of your station.
  • The month and year defining the period for the prediction.
  • The antenna configuration for the transmitting and receiving stations.
  • The transmitter output power.
  • The bands for which you want a prediction.
  • The area to be mapped for the graphics.

The type of prediction defines the output generated by the service and affects how long it will take to deliver the results. On-Demand predictions take about 5 seconds while the other types will take between 10-20 minutes depending on how many bands you include in the predictions.

A backend system handles the generation of longer predictions and you will receive an email when your prediction results are online.

Prediction results remain available for a period of time depending on the type.

  • On-demand types - 1 hour
  • All other types - 14 days

At the end of these periods, the prediction results will automatically be deleted.


An On-Demand prediction generates a coverage map for a single band/hour combination. It normally takes 5 seconds to generate and will automatically display the results in your browser. On-Demand predictions may be made using custom station configurations or the pre-set profiles included by the service. On-Demand prediction results are available to you for 1 hour
and will then be automatically deleted.


A Prediction will generate both a PDF and on-line graphics for each band you select. A full set of predictions are held under a Prediction Result (PR) generated by the service. The PR holds links to the PDF file and Band Plots (BP) fpr each band. The BP is an online gallery of the images for each hour of the day for a specific band. You can quickly scroll through the hours and then zoom in on a full size image by clicking on the zoom button at the top right of the image.

This form of Prediction models your station as the transmitter with receivers all over the world with specific antennas at each end. Antennas are modelled as omni-directional antennas withgain equivalent to the antenna you specify in the Station configuration.

Inverse Prediction

An Inverse Prediction is similar to a Prediction but models your station as the receiver with transmitters all over the world. In this case, the receiving station configuration should reflect your station antennas. The transmitter configuration represents the power level and antennas at each of the distributed stations.

In most cases, if you had the same station configurations at each end (including power levels),your would see the Inverse Prediction look very similar to the forward Prediction.

Contest Strategy

The Contest Strategy prediction is designed to help you develop a strategy for an upcoming contest. The service generates a single PDF and image gallery with four bands mapped on a single page for each hour of day and night. For day operations, the page contains coverage maps for the contest bands 20 through 10. For night operations, the page contains contest bands 80 through 15.

You can configure the hours of day and night - with overlap to cover sunrise and sunset hours.

With four bands mapped per page, you can see predictions for each hour of the day on a single page for comparison and strategy design.

Log Analysis

The Log Analysis prediction allows a Cabrillo contest log to be uploaded and analyzed against a Prediction. A PDF and image gallery are generated for each band you operated in the contest(exlcuding 160m) with a combination of the prediction map overlaid with a small circle for each station you worked. The location of each station in your log is looked up in a database and if found, plotted on the map.

For contests spanning multiple days, the analysis aggregates the results from each day onto a single band/hour plot.

This prediction type is very useful for comparing your log against the predictions and comparing your strategy against predicted conditions.