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A
full tuning cycle
“starts from scratch” and begins a fixed tuning sequence where the YT-
450 rapidly tries varying combinations of inductance and capacitance values, and then zeroes-in
on the best match possible. When the tuning cycle is complete, if an acceptable match was
found, the inductance and capacitance settings are saved in a memory associated with the
selected frequency, so that they may be recalled quickly in the future via a memory tuning cycle.
In this manner, the YT-450 “learns”; the longer you use it, the more closely it adapts itself to
the bands and frequencies used. Most users will probably use memory tuning most of the time; it
takes advantage of any saved tuning settings, but automatically defaults to a full tuning cycle if
no stored data is available.
In both cases, at the end of the tuning cycle, the carrier is held for 1.5 seconds after tuning is
complete, so that the final SWR may be read on the transceiver’s internal SWR meter or another
inline SWR meter, and the front panel LED will indicate the status of the tuning cycle.
The tuner may also be placed in “bypass” mode where it is electrically removed from the
antenna system.
Toggle Bypass Mode:
To toggle between bypassed and active mode, press the front panel Tune button on the YT-
450 momentarily. The Status LED will flash three times to indicate that the tuner is in bypass
mode. Press the front panel Tune button momentarily again to recall the previous tuner settings.
The Status LED will flash once to indicate that the tuner is no longer bypassed. This function