PAGE 8
OPERATION
Basic Tuning Operation
The Z-100Plus is operated from the front panel TUNE button on the Z-100Plus itself
2
. Two
types of tuning cycles are available; a memory tuning cycle and a full tuning cycle.
The memory tuning cycle attempts to tune quickly based on having previously tuned on the
present frequency selection. If the tuner previously was successful in tuning on the currently
selected frequency, the settings for that match will be loaded into the tuner relays, and checked to
see that an acceptable SWR match is found.
A full tuning cycle “starts from scratch” and begins a fixed tuning sequence where the Z-
100Plus 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 Z-100Plus “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 LEDs 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 Z-
100Plus momentarily. The SWR LED will flash three to indicate that the tuner is in bypass mode.
Press the front panel Tune button momentarily again to recall the previous tuner settings. The
Tuning LED will flash once to indicate that the tuner is active. This function may be useful if you
wish to compare antenna performance with and without the benefit of the tuner’s matching
network.
2
If a compatible Icom transceiver is connected via the interface cable, the tuner may be operated from the “tuner” button on the Icom radio,
also.
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