Specifications

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. 47 © 2003 SGC Inc
5.1.6 Initialization
The microcomputer is usually in the Stop mode and requires an
interrupt signal (XIRQ) to start program implementation. The
XIRQ comes from the RF detector circuitry. This line, going low,
will wake the CPU.
5.1.7 Jumper Settings
The MAC-200 may be bypassed for broadband (un-tuned antenna)
scanning in receive mode. All you need to do is press the reset
button or turn power off and on. When the coupler comes back on,
the tuning elements remain out of the circuit until the Smartuner is
activated by a transmitted signal.
If broad band operation is required during receive for scan
operation, jumper JP1 may be set to the Yes position. This will
drop the tuning elements out of the circuit on receive only. Jumper
JP1 is located adjacent to MCU (U5) along the edge of the printed
circuit board. Setting JP1 to the Yes position is recommended if
you are using a radio for split band communications, for scanning
JP1 in the NO
(default) position
JP3 in the YES
(default) position