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Bypass Mode
The AT-600Pro 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-600Pro’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.
If an ICOM radio and interface cable is used, the AT-600Pro 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.
Error Indication
When performing a tuning cycle, there are several conditions that may occur that cause the
tune to fail. All are reported as an error, via blinking the front panel LEDs in a particular fashion.
The following errors are reported:
ERR_NO_MATCH: Unable to find a suitable match. Upon completing an entire full
tuning cycle, no combination of inductors and capacitors was able to bring the SWR below 3.5:1.
ERR_NO_RF: No RF power was present at the beginning of a tuning cycle. In other
words, the Tune button was pressed to request a tune cycle, but the transmitter was not keyed up.
ERR_LOST_RF: RF power disappeared before the tuning cycle completed. You must
continue to key the radio until the tuning cycle completes.
ERR_NO_FREQ: Unable to determine operating frequency. In order to store a memory
match, the frequency of the transmitted RF must be known.
ERR_OVER_PWR / ERR_SWR_PWR: Relay protection activated. Because the relays
may be damaged if they are switching during high power operation, software prevents the relays
from toggling under certain conditions. Relays will not toggle if the SWR is over 3.0:1 and the
power is over 100 watts, and will not toggle if the power is over 150 watts regardless of the
SWR.
The diagrams on the next page show what the various error indications look like.
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