Specifications

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NO - In this position the coupler will keep 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.
5.1.9.4 JP3 – Tune from Memory
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
JP3 – Factory Default
Setting - YES