SOUTHERN AVIONICS COMPANY
Model SA100 Dual 2-17Theory of Operation, Radiobeacon
2.3.5 Modulator Driver
The keyed code tone signal from the Tone Key board is adjusted with the MOD control on the
front panel mounted ACTRL board and added to the voice signal from the optional Audio board,
and a DC voltage, at the input of the Modulator Driver Q1, Q2 on the Exciter Mother Board. The
output of the Modulator Driver is adjusted with the RF Level control on the ACTRL board and
routed through coax to the RF Mother board(s) and connected to the pin 9 input of the Modulator
(DMOD) board(s). For a schematic of the Modulator Driver see drawing "SA Series Overall
Schematic." For a diagram of the Modulator Driver, see drawing "SA Series Exciter Control
Motherboard Diagram."
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