User manual

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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 broad band (un-tuned antenna)
scanning listening 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 in the NO
(default) position
JP3 in the YES
(default) position
Mailing: PO Box 3526, Bellevue, WA. 98009
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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
selective calling protocols, or for Automatic Link Establishment
(ALE). The default is: Tuning Out In Rcv: [NO].
Jumper JP3 bypasses the coupler’s memories. This means that each
time the coupler is used on a different frequency, it will retune
rather than use previously stored information. The default is: Tune
From Memory: [YES].
5.1.8 Program Description
When DC power is applied, the computer initializes the processor
registers in accordance with the hardware. All tuning elements are
then removed and the ‘tune’ indicators are turned off. At this time
the computer reverts to a “sleep” mode awaiting RF power.
5.1.8.1 Auto Mode
In the Auto Mode, the MAC-200 will select the proper antenna as
well as the proper tuning settings for the antenna from memory if
possible.