LDG AT-100Pro, Operation 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-100Pro 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-100Pro with an ICOM transceiver connected with the ICOM interface cable, pressing
the TUNER/CALL button on the transceiver initiates a memory tuning cycle
3
.
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-100Pro 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 supplied 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-100Pro 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-100Pro’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.
If an ICOM radio and interface cable is used, the AT-100Pro 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.
3 The IC-756 Pro is an exception. If using the AT-100Pro with the IC-756 Pro, press the TUNE button on the AT-100Pro.