Monthly Archives: January 2020

wtKST Download and Setup

wtKST is a clean, simple user interface to the ON4KST online chats – with some extra features for Aircraft Scatter prediction.

wtKST was written by DL2ALF, the author of the AS prediction program AirScout and the two programs are linked. If AirScout is running in the background, wtKST will check the list of stations that are logged into KST and warn you about possible AS opportunities. Click on a callsign and the AirScout map will appear with more information.

(This note was first written because the usual download site at was unavailable. It has come back now, but I’ll leave this page here.)

Note: wtKST is not ‘officially’ supported, so please do not ask questions to DL2ALF!


wtKST has one fixed-format screen, divided into four main areas:

  1. All the chat traffic (Left) – just like the official ON4KST chat interface (and just as unreadable when the bands are busy)
  2. A ‘filtered’ chat window (Lower Left) containing only the messages to and from yourself (like the KST2me filtered chat, but no setup required)
  3. Message input line (Top Left).
  4. KST login list (Right). If AirScout is also running, this is where the added info about AS opportunities will appear (see below).

wtKST is less configurable than either the ON4KST interface or KST2me by OZ2M – but the features you most want are already there, and are easier to use:

  • Left-click on any other station on the login list, then type in your message at the top Right.
  • Your personal message traffic will appear in the lower window (including your own outgoing messages if that option is selected – see below).
  • Right-click on any other station to see info, including distance and beam heading.

wtKST Setup

You should only need to do this once. – just follow these instructions.

  • Before you begin: you must already have signed up with the official ON4KST site to register your username and password.
  • Download the latest version from  Unzip the .zip file to a directory of your choice, and wtKST.exe should run.
  • In wtKST: click Options, choose the KST tab, and enter that same login information. Also enter your station info and other selections.

kst tab

  • Next, click the Calls tab and choose which bands and stations you want to display.

calls tab

  • Move along to the Airplane Scatter tab and check the two boxes below (use the default server settings). The bottom line lets you choose the minimum and maximum aircraft ranges you wish to know about.

scatter tab

  • Close the Options dialog and away you go –  wtKST is now your window into the selected KST chat.
  • To get the information from AirScout, open that program, and choose Options from the main screen. Select the Network tab and check Activate main server.

as activate tab

wtKST will now begin to highlight Aircraft Scatter opportunities with various stations in the Right-hand columns. (The quickest way to populate these columns is to start (or re-start) wtKST after AirScout.)

wtKST In Action

The chat function has already been described. The rest of this section is about the extra features in the Right-hand columns of the wtKST display.

NB: you will only see info about stations that are logged into KST – don’t forget there are others too!

  • The Call column is obvious. Left-click on the word Call to sort the list into callsign order. (Left-click again to remove this feature.)
  • The A or Activity column shows the number of minutes since that station posted to KST. Left-click on this column header to prioritize the most active posters (Left-click again to remove this feature.)
  • To see information about a station – including distance and beam direction – move the pointer over that station’s Call, Name, Locator or Act.
  • To send a message to someone, Right-click on that station’s Call, Name, Locator or Act. Then type into the message input line (top Right).
  • The AS column shows Aircraft Scatter opportunities for each station. This powerful feature is unique to wtKST, but it is only active if AirScout is already running.
    – Same as with AirScout, purple blobs in the RH columns mean “AS is possible now!“. Red followed by a number means “AS coming soon, in n minutes”. Brown/orange means “aircraft is on track, but currently too low”. Bigger blobs indicate more/better opportunities.
    – Depending on your minimum and maximum distance settings (see setup above),  you may also see < which means “too close”, or > which means “too far away for AS”.
    – Left-click on these indications to open the main AirScout map, showing the AS path to the selected station.
    – Right-click in this column to see details of the target aircraft.
  • The far Right-hand columns indicate which bands a station is active on (probably according to their information in the AirScout database). You can click on these colours to change them in your own display.

If you have further info about the wtKST setup and user interface, please post a comment here so I can update the blog. Thanks for all suggestions!