LDG AT-200PROII, Руководство по эксплуатации, Страница: 15 / 27

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If you are not using the optional ICOM or Yaesu radio interface cable, you will need to key
the radio manually in AM, SSB, or CW mode. 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 150 watts during tuning.
If the memory tune is not successful, the AT-200ProII falls through to full tuning cycle. At
the end of a tuning cycle, the LEDs cycle inwards to indicate a successful tune. You may then
begin transmitting.
If using the AT-200ProII with an ICOM transceiver connected with the ICOM interface
cable, pressing the TUNER/CALL button on the transceiver initiates a memory tuning cycle.
The AT-200ProII will not tune if the transmit power is over 150 watts, or if the transmit
power exceeds 100 watts during high SWR conditions, in order to protect the switching relays.
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-200ProII 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
The AT-200ProII may be placed in bypass by pressing the Tune button momentarily (less
than 0.5 second). Bypass places the tuner in a pass-thru configuration, where the tuner behaves
like a coax jumper, not affecting the antenna match. Bypass may be useful for comparing the
effect of the AT-200ProII’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, the
Bypass LED is lit. As soon as any tuning element is
changed away from it zeroed condition, the
Bypass
LED will extinguish.
2 An SW R roll back circuit automatically reduces the output power level when high SWR is present. Check your radio’s manual to see if your radio uses a roll back
circui t.