LDG AT-100ProII User Manual

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If you are not using the ICOM or Yaesu radio interface cable, you will need to key the radio
manually. In SSB or AM modes, begin talking into the microphone. Hold down the code key on
CW. Note that if your radio does not incorporate an SWR rollback circuit
2
, you will first need to
reduce power to 25 watts or less. In no case should you transmit more than 125 watts.
If the memory tune is not successful, the AT-100ProII falls through to full tuning cycle. At
the end of a tuning cycle, the LEDs cycle inwards to indicate a successful tune.
If using the AT-100ProII with an ICOM transceiver connected with the ICOM interface
cable, pressing the TUNER/CALL button on the transceiver initiates a memory tuning cycle.
Manual Full Tune
As with the memory tuning cycle, if your radio is not equipped with a rollback circuit,
reduce power to 25 watts or less before tuning. To explicitly initiate a full tuning cycle, press and
hold the Tune button on the AT-100ProII front panel for more than 2.5 seconds. The LEDs will
display the following pattern to confirm a full tuning cycle is requested:
If you are using one of the optional radio interface cables, the radio will automatically reduce
power, switch to CW mode, and begin transmitting while the full tuning cycle is in progress. If
not, key the radio (Talk into the mic on SSB or AM, close the key on CW) until the tuning cycle
is complete. As with the memory tuning cycle, when the tuning cycle is complete, the LEDs will
scan inward to indicate a successful tune.
Bypass Mode
The AT-100ProII may be placed in bypass mode by pressing the Tune button momentarily
(less than 0.5 second). Bypass mode places the tuner in a pass-thru configuration, where the
tuner behaves like a coax jumper, not affecting the antenna match. Bypass mode may be useful
for comparing the effect of the AT-100ProII’s tuning versus the unmatched antenna system.
Pressing Tune momentarily again will return the tuner to active mode, and the relay settings of
the previous match will be restored. When in bypass mode, the Bypass LED is lit.
If an ICOM radio and interface cable is used, the AT-100ProII may also be bypassed by
pressing the TUNER/CALL button momentarily. On some models of ICOM radios, changing
bands will also automatically bypass the tuner.
2 An SWR rollback circuit automatically reduces the output power level when high SWR is present. Check your radio’s manual to see if your radio uses a rollback
circuit.

LDG AT-100ProII Specifications

General

Brand	LDG
Model	AT-100ProII
Category	Tuner
Language	English