Specifications

SMARTUNER MANUAL 43
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]
E-Mail: [e-mail] Web Site: www.sgcworld.com
C
C
L1
50 ohms
Antenna
out
in
The versatile MicroTune
™ software offers its user these special functions:
1. The coupler is activated whenever forward power is present.
2. In addition to sampling VSWR to determine if the coupler should retune,
frequency comparison is employed. This causes the coupler to tune whenever
the transmit frequency changes independent of the VSWR reading.
3. Extensive tuning paths are used to test different antenna situations. The initial
tuning of a new frequency (or switched antenna) may require a few seconds.
Any further tuning is accomplished in a matter of milliseconds if jumper JP2
(Tune From Memory) is in its default position.
4. Facilities and algorithms are used which enable accurate tuning at the low end
of the frequency band—even on shorter antennas than previously possible.
5. The BITE (Built-In-Test-Equipment) Indicator Tune LED includes a safety
feature that alerts the operator to a mismatched condition, with blinking
indicators, when proper tuning conditions have not been met. In this situation,
the software will “time out” within 10 seconds unless a new frequency is
sensed, which will cause an immediate time out, and the coupler will attempt
to match the new frequency.
The microprocessor of the coupler “wakes up” every time the coupler has forward
power. However, re-tuning takes place only if the frequency has changed or the VSWR
exceeds 2:1.
8.1 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.