8611/SM SIGNAL MONITOR OPTION
APPENDIX A
A-5
A.6.2 SM IN 2 INPUT
The SM IN 2 input connector (W10J6) accepts an IF signal centered at
21.4 MHz up to 10 MHz in width. The source of the input signal may be from
the WJ-8611’s SDU output or from another receiver. The maximum input
level that can be received at this input without damaging the equipment is
+10 dBm. This SMA connector has an input impedance of 50 ohms. Cable
W11 (P/N 17300-774-003) is provided to make the interconnection between
this input and the WJ-8611’s SDU output. The SM IN 2 input is selected for
IF pan processing via the A802
H
command.
A.6.3 SM CTL INPUT/OUTPUT
The SM CTL connector (W8J7) is a 9-pin D connector that provides an
alternative control interface to the WJ-9168 when not controlled through the
WJ-8611’s IEEE-488 interface. Also, the SM CTL connector can accept two
spectrum inversion control inputs from external receivers. Refer to
Figure A-3
for the SM CTL pin configuration.
Table A-2
summarizes the
functions associated with these pins.
Pins 1 and 4 of this connector are spectrum inversion inputs associated with
the SM 1 IN and the SM 2 IN RF inputs, respectively. These inputs can be
driven by external receivers which normally have inverted IF spectrums or
which compensate for tuning schemes that invert the IF spectrum at particular
frequency bands. When a control signal is received by the WJ-9168, it flips
the spectrum display 180 degrees, allowing a seamless IF display despite
tuning the receiver across frequency bands with opposite spectrum inversions.
The tuning scheme of the WJ-8611 requires no such compensation. The
WJ-8654 and WJ-8615P are two receivers that provide such a control output.
Pin 9 can be used as a common ground for pin 1 and 4 inputs.
While the SM CTL connector does provide physical access to the WJ-9168’s
single-drop and multi-drop RS-232 interfaces, the WJ-9168’s factory
configuration de-activates these RS-232 interfaces in favor of an RS-422
interface internally connected to the WJ-8611. Pins 2, 3, and 5 are used for
RS-232 interconnection. Pins 6, 7, and 8 are used for RS-232 pass-through
mode. Refer to the
WJ-9168 Installation and Operation Manual
for further
details.
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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