LDG AT-100Pro User Manual - page 13
Unkey your transmitter or transceiver and reset to your desired power if you changed for tuning
−
you’re ready to operate. The new tuning parameters are stored for the present operating
frequency, replacing any parameters that were previously stored for that frequency.
Memory Tuning Cycle (Medium press)
If you are tuning near a frequency at which you have already completed a tuning cycle, you can
reset the tuner very quickly by using a Memory Tuning Cycle. Key your transmitter as described
above, and press and hold the Tune button for .5 to 2.5 seconds, then release. The tuner will
automatically check for a saved tuning setting, and if present will restore that setting in a small
fraction of a second. If no tuned setting is saved near the present frequency, the tuner will begin a
full tuning cycle, saving the result when finished for future operation on that frequency. In this
way, your AT-100Pro “learns”; the longer you use it, the more closely it adapts itself to the bands
and frequencies you use. You will probably use Memory Tuning most of the time; it takes
advantage of any stored tuning settings, but automatically defaults to a Full Tuning cycle if no
stored data is available.
Memory frequency step size varies with band. Steps are very small on the 75 meter band to
accommodate the expected higher Q of most antennas, whereas the step size is somewhat larger
on 10 meters where antenna Q is usually lower.
Medium Press > .5 Sec for Auto Tune
Bypass mode (Short press)
To place your AT-100Pro in bypass mode, press the Tune button less than a half-second. The
tuner will switch to bypass. All LEDs will flash once to confirm bypass mode. In bypass mode
RF from your transmitter goes directly to the antenna with no matching. A second short press
toggles the tuner back to its last tuned setting; the LEDs show which C and L relays are
energized. Bypass followed by
Func+Tune
will clear the present memory. Bypass mode is not
saved when you power down. On the next power up, the tuner will reset the last tuned settings.
You can if you wish press Func-Tune to save the bypass setting, erasing the memory for that
frequency.
Power and SWR Indication
During a tuning cycle the Power and SWR LED meter indicate forward power and the present
SWR, respectively. If you are using a transmitter or transceiver with SWR rollback protection,
you will see the forward power vary up and down quite a bit during a tuning cycle. During
transmit, both forward power and SWR are displayed if this option is selected in the startup
options.
When no LEDs are lit on the SWR meter when RF is present, it means that the SWR is less than
1.1. When the LED segment labeled 1.1 is lit, it means that the SWR is between 1.1 and 1.3. The
1.3 LED indicates an SWR between 1.3 and 1.5, and so on. Read each LED segment to mean
"equal to or greater than the marked SWR, but less than the next higher marked SWR".
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