Sutron Corporation Satlink Operations & Maintenance Manual, Rev 8.04.2 11/3/2016 pg. 101
Window center enable causes Satlink to delay a transmission that does not last the entire
allowed length so it is centered during the assigned window. Window centering helps the
satellite system to operate more efficiently. In the example above, if the transmission were 20
seconds long, it would start at 00:02:35 instead of 00:02:30 if window centering were enabled.
10.2.3. Satellite Type and Channel
The satellite types are as follows. Each type has a number of channels that can be used for the
transmitter. The channels are assigned by the governing agency. Any error entering the channel
may cause the transmitter to interfere with other stations.
10.2.4. Satellite ID
The Satellite ID is an 8 character Hexadecimal value (0-9, A-F) that is assigned by the governing
satellite agency to uniquely identify the transmitter. Any errors entering the Satellite ID may
cause the transmitted message to be lost or ignored.
10.2.5. TX Format
The TX Format field sets the format that Satlink uses when it transmits its data. There are
several different format types: "SHEF", "SHEFFIX", “Pseudobinary”, “ASCII Column”, and “ASCII
Sensor”. Each has its own distinctive advantages.
"SHEF" formats the data into readable ASCII messages. "SHEFFIX" is just a modified version of
"SHEF" where the data is positioned in fixed spacing so that it will line up better when displayed.
However, both the SHEF and SHEFFIX formats generally create long messages.
The “Pseudobinary" format encodes the data into 3 characters that you cannot read without the
aid of a program. This format is over 50% shorter than the SHEF and SHEFFIX formats which
results in shorter transmissions and lower power consumption. Although it is much harder for a
person to visually inspect the data in this format, it is a much more efficient format for sending
data.
There are several flavors of the Pseudobinary format. Please see details in section PSEUDOBINARY
B DATA FORMAT .
“ASCII Column” and “ASCII Sensor” formats are similar to SHEF in that they create human
readable and lengthy messages.
“ASCII Column” transposes the data, showing data from different sensors on each line. The
columns will have data from the same sensor.
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