G2.4 T854 Optional Features M8SL2-00-002-812
© Copyright Tait Electronics Limited August 2004. All rights reserved.
2.2.1 Line Limiter Option
This option should be fitted if no line transformer is installed.
2.2.2 Line Attenuator Option
When enabled this attenuates the line input by approximately 20dB
2.3 Opto Key
The keying circuitry may be completely isolated from the rest of the system by means of
the optocoupler (IC250). A constant current source (Q270) allows keying voltages
between 6 and 50 V.
R240 and R243 have replaced SL203 and SL204, originally on the T856 underside. These
connect the opto key to D-range 1 pins 11 and 12, and when removed free the D-range
pins for alternative use.
Enabled Disabled
%D205 1N4531 Not Fitted
%D210 1N4531 Not Fitted
Enabled Disabled
Link 1 Open Closed
%R211 470Ω Not Fitted
%R220 470Ω Not Fitted
%R228 120Ω Not Fitted
Opto+ to PL100/11 PL100/11 Free
R240 0Ω Not Fitted
Opto- to PL100/12 PL100/12 Free
R243 0Ω Not Fitted
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