Specifications

SMARTUNER MANUAL 42
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
© Nov2000 SGC, Inc. P.O. Box 3526, 98009 Fax: [phone] Tel: [phone]
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data is found, it is tested for validity, and the required “end of tune” conditions will be sensed
by the RF sensors. Then the data will be latched in place, and the CPU will again wait for RF to
cease transmitting and return to the Stop mode. This process takes about 20 milliseconds,
which is the same length of time that is required to close the network relays.
7.7 Initialization
The microcomputer is usually in the Stop mode and requires an interrupt signal (XIRQ) to
start program implementation. The IRQ is obtained from the RF detector circuitry. This line
goes into the XIRQ pin of the CPU and will wake the CPU from the Stop mode.
7.8 Bypass Operation, Jumpers
The SMARTUNER may be bypassed for broadband (untuned antenna) scanning listening. All
you need to do is press the reset button of the SmartLock (if installed) or turn power to the
coupler 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 broadband 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 U1. If you open your SMARTUNER to access this jumper, please use
caution to ensure that the waterproof seal is carefully placed prior to refitting the coupler
cover.
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 JP2 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].
SMARTUNER
MicroTune
™
Software
8.0 Tuning Processes and Options
The SMARTUNER MicroTune™ Software is unique software that allows precise tuning
of the digitally controlled
pi and L network to tune a wide variety of antennas.