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Wattmeter Scale: The Power LED bargraph displays either 0 to 12.5 watts or 0 to 125 watts
full scale. To toggle between these two scales, press Func -> L Up. The LED marked “10” or
“100” will light momentarily to indicate the newly selected scale.
Automatic Tuning Mode: The AT-100ProII may be set for either semi-automatic tuning or
fully automatic tuning. In semi-automatic tuning mode, a tuning cycle will not begin unless
specifically requested by pressing the Tune button. In fully automatic tuning mode, a tuning
cycle will begin any time there is RF present and the SWR exceeds a pre-set level. The default
setting is fully automatic tuning mode.
To toggle between semi- and fully automatic modes, press Func -> C Dn. The LED display
will show one of the two patterns to indicate which mode has been selected:
Automatic Tune SWR Threshold: When the AT-100ProII is in fully automatic tuning
mode, an automatic tuning cycle will begin any time RF is present and the SWR has exceeded a
set threshold. This threshold is user-programmable to any value between 1.1:1 and 3.5:1. To set
the automatic tune SWR threshold, press Func -> L Dn repeatedly (press Func, then L Dn;
Func, then L Dn, and so on...) to cycle through all the options. The SWR threshold will be
displayed on the SWR scale momentarily.
The default value of SWR threshold is 2.0:1. The following example shows setting the SWR
threshold to 1.7:1.
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