The Model 2100 FM SCPC (Single-Channel-Per-Carrier) Frequency Agile Modulator was designed to process and modulate an audio baseband signal onto a intermediate frequency (IF) of 52 to 88 MHz. This modulation process is the first in a series of block functions that comprise a satellite uplink. The Model 2100 Modulator consists of a standard 19" x 1.75" (1 rack mounting space) chassis which houses the power supply and integrated modulator- audio processing assembly. The Input and audio processing section of the Model 2100 provides for necessary audio processing (filtering, companding and emphasis). This is accomplished by on-board audio filtering and emphasizing. The companding process is accomplished by a plug-in subassembly on the main modulator circuit card. Plug-in companding is necessary since there are multiple types for various audio applications. The Modulator section upconverts the output of the processing section to an IF carrier in the IF frequency of 52 to 88 MHz (full 36 MHz C-Band satellite transponder width). This section also facilitates the entry of keypad, frequency display, monitor points, alarm indicators and carrier switching.
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