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When the Java Control Panel opens, select the tab marked "Security" (see screen shot below) 4. Click "OK" to close the Java Control Panel In Macs: 1. Go to the Interactive Sky Chart by clicking on the link from the website header, then click on the Interactive Sky Chart link within the article.Click the apple icon in the uppser left corner, then choose "System Preferences..." 2. The applet may take time to download, especially if you have a slow connection.So the gateway program reads the keys sent to it from the terminal program, adds them to a custom message, and sends the result to the tracker.Assuming the messages arrives intact, the tracker replies with an ACK; any other reply (or no reply at all) results in the message being re-sent.
Sky & Telescope's Interactive Sky Chart is a Java applet that simulates a naked-eye view of the sky from any location on Earth, at any time of night, on any date between 16 A. Charted stars and planets are the ones typically visible without optical aid under clear suburban skies.
Each time that a key is pressed in the terminal window, the key character is sent to the gateway that stores it ready for radio upload to the balloon tracker.
Normally with balloon trackers, they transmit all the time, but instead this tracker sits listening for an uplink, to which it replies immediately.
Most often this is RTTY or (in the USA APRS) but there are alternatives such as Lo Ra which more easily provides a means of reliably transmitting data to the balloon as well as from it.
This greatly expands the range of things we can do during a balloon flight, for example: Another possibility is to run a terminal session between ground (client) and balloon (host), allowing programs to be run on the balloon tracker as requested by a ground station: This could even be used to change the tracker program, or have that program use new configuration parameters.
The following diagram shows how this is achieved in software: The Lo Ra gateway is the standard release with modifications added to provide a server socket on a specified port, to which any network terminal program (e.g. In this case I have written a simple terminal program, in Delphi, that screen-scrapes the terminal window and sends the contents to a Python script, which then updates a web dashboard so that anyone with the URL can see what I see in my terminal program.