Use of the default block

As the name suggests, the default block allows observers to modify system defaults without the need to alter system files.

Common problem:

While the format for any valid card in the default is the same as those modifying source cards, use of the leading slashes (ie, //DS) are not adequate in designating bands! The file checking programs will only check the card format but will not alert you to their mis-use!

Example:

/DEF
//DS             3    <- Observer desires 3-second integration...but at what band??
/EDEF

Corrected example:

/DEF
XXDS             3    <- Observer selects 3-second integration for X-band only!
/EDEF

Note that this is the same format found in the SUBn file...