SGC SMARTUNER SG-237 Technical Information download pdf (Page 13)

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longer capacitive.

3. Fine tuning is performed by trying a small amount of input capaci-

tance (this may or may not be required).

4. At this point, the program acts the same as step 5 in section 4.2.1

The preceding gives a simplified program flow on only two possible

antenna conditions. Much more complex tuning is normally the case.

Further detailed description is beyond the scope of this manual.

4.2.3 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 for-

ward power is detected.

NO - In this position, 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 per-

formance. If in band, operation is typical and duplex or simplex is the

predominant mode of operation, then No is usually the better choice.

4.2.4 JP3—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 cou-

pler 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 pro-

ceed 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

JP3 in the Yes position. If operation is as expected, don't change it.

SG-237 Manual

page 13

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SGC SMARTUNER SG-237 Technical Information Page 13