8
Operation
Your AT-7000 is controlled entirely through the TUNER/CALL button on the IC-7000
transceiver. Feedback on tuner operation is provided by the TUNE icon in the upper left of the
radio’s display. When you power up the radio, the AT-7000 powers up and automatically resets
to a bypassed condition. The TUNE icon will be off.
To run a tuning cycle, simply press and hold the TUNER/CALL button on the radio for 1 second,
then release. The radio will transmit a CW carrier of about 10 watts, a tuning cycle will run to
completion (using stored memory parameters if available), then automatically end. The radio will
return to receive mode, with RF power reset to its previous operating level.
During the tune process, the TUNE icon will flash, showing that the tuner is in the process of
tuning. Do not attempt to use the radio during the tuning process.
Once the tuning process is complete, the TUNE icon will show the status of the tuned state. The
TUNE icon will be on when the tuner was successful in obtaining a match of about 1.5 or less.
On rare occasions, your AT-7000 may not be about to achieve a satisfactory match. This is
usually due to a highly reactive antenna that is far from resonance. In this case, the tuner will go
into bypass mode at the end of the tuning cycle, and the TUNE icon on the radio will be off.
Adjust the antenna as necessary, and tune again.
Note: The IC-7000 does not display the SWR during the tuning process. To display the SWR
after a tune, select the SWR indicator scale from the radio’s menu, and transmit a carrier (AM,
FM, CW). The SWR will then be displayed on the SWR scale.
To place your AT-7000 tuner in bypass mode, press the TUNER/CALL button on the radio for
less than one-half second, then release. The TUNE icon will go off. In Bypass mode, RF from
your transmitter goes directly to the antenna with no matching. To return the tuner to operation,
simply press the TUNER/CALL button for one second and release to start a new memory tuning
cycle.
Important Note: The IC-7000 does not adjust the tuner when you change bands; your AT-7000
does not “know” when you change bands. Thus, the tuner may be matched for one band, with the
radio changed to a different band. In this case, the TUNE icon will still be on, even though the
tuner is not matched to the new band. Always re-tune after you change bands.
Your AT-7000 has 2,000 frequency memories. These are "Continuous Q Matched" memories
from 1.8 MHz to 54 MHz; there are more memories on lower frequencies where antenna Q is
usually higher, and fewer memories on higher frequencies). When you tune on or near a
memorized frequency again, the tuner sets those parameters in a fraction of a second, much faster
than a full tuning cycle.
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