User's Manual

2-11
Control Configuration for 2/4 Wire (+/-)DC/Ground/Tone/
(Current Loop) Keying Control Board.
Assembly #: 923051
R7: Tx Audio SW2: Selects either Local
(-25 dBm sensitivity; or Land Line Current
increases clockwise). Loop Keying.
R10: 2 Wire Rx Balance @ 600O J1: Selects DC or Current
(1mV RF @ 1KHz, 30% Mod.) Loop Keying operation.
R10 adjusted for minimum J2: Selects either Land Line
amplitude at C6/R4 junction. (L/L) or Single Line (S/L)
R22: Keying Tone and +/- DC or Ground
(-30 dBm sensitivity; keying operation.
decreases clockwise). J3: Selects Tone and/or +/- DC
R25: Rx Audio Keying enable or disable.
(-10 dBm output level; J6: Selects between Internal
increases clockwise). or External Current loop
R44: Time Out Timer keying (ICL/ECL).
(15 to 300 sec.; J7: Keying timer
90 sec. Nominal; Enable/Disable.
increases clockwise). J4: Input Connector.
SW1: Selects either 2 Wire J5: Output Connector.
or 4 Wire operation.
NOTE: Bold Italics indicate Factory default configurations.
Figure 2-3 Line Interface/Remote Control Board P/N 923051-1