Specifications

SG-231 MANUAL
SGC Inc. SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA
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The preceding gives a simplified program flow on only two possible antenna
conditions. Much more complex tuning is normally the case. Further detailed
description, however, is beyond the scope of this manual.
8.2.3 JP1—Tuning Elements Out During Receive
(Factory Default Setting: No)
YES In this position the software will retain data required in transmit to
match the coupler while removing all tuning elements when no forward
power is detected.
NO In this position the coupler will retain the required tuning data and
will change nothing whether in receive or transmit.
If typical operation is out of band duplex, Yes would be most likely to give better
performance. If in band operation is typical and duplex or simplex is the predominant
mode of operation, then No is usually the better choice.
8.2.4 Jp2—Tune From Memory
(Factory Default Setting: Yes)
YES In this position the coupler will recall data previously saved and
try this data before attempting to re-tune. If the data is valid and the
VSWR is less than 2:1 the tune is completed. In this position the coupler
will save any new data in its memory for any frequency. A new frequency
must first be learned, while in this mode, before it can be recalled.
NO In this position, the coupler will not use previously saved tuning
data. Each time a different frequency is selected, the coupler will proceed
through a complete tuning sequence.
Clearly, the advantage of Yes is speed. The coupler will seem to be matched instantly
when in this position, if the frequency being used has previously been saved in
EEPROM. Disadvantages include a difference in frequency too small for the computer
to detect. This would result in recall of valid data that may not necessarily present the
best match.
We suggest starting with JP2 in the Yes position. If operation is as expected, don't
change it.
Note: The SG-231 does provide a way to by-pass tuning from memory
even with JP2 set to Yes. To do this the SmartLock Pro must be installed. If the
coupler tunes from memory and you want the coupler to try to find a better
setting, do the following:
1. Switch the SmartLock Pro to Tune Lock.
2. Press the reset button whiled the Tune Locked LED is flashing.