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The Auto/Semi switch controls how the tuning process will be envoked. In Auto mode (Auto/Semi
toggle switch in Auto), the tuner will seek a 1.5 match (or better) anytime the SWR rises above 3.0.
In Semi mode (Auto/Semi toggle switch in Semi), the tuner will seek a match only when the Tune
push button is pressed. Both modes require that more than 0.1 watts of RF power be present. If the
Tune button is pressed and there is less than 0.1 watts of power, the four front LEDs will flash once
to indicate that there was not enough RF to tune properly.
The Capacitor and Inductor Up and Down switches are used for fine tuning the inductors and
capacitors and can be used in either, Auto or Semi mode. Pressing either of the Up switches will
increment that tuning section until it reaches the maximum range. When the maximum value is
reached, all four LEDs will flash. Conversely, pressing either of the Down switches will decrement
that tuning section until it reaches the minimum range. When the maximum value is reached, all
four LEDs will flash.
Besides envoking the tuning process, the Tune push button has some other functions. Pressing the
Tune and Ind Up push buttons at the same time will cause the Hi/Lo-Z relay to move to the Hi-Z
position. The Tuning LED (red) will flash to indicate the change. Pressing the Tune and Ind Down
push buttons at the same time will cause the Hi/Lo-Z relay to move to the Lo-Z position. The 1.5
SWR LED (green) will flash to indicate the change.
Pressing both Down switches at the same time will reset the processor and place all relays in a
bypass position.
The back panel has SO-239s for connecting UHF type connectors to the antenna and transmitter. A
coaxial power jack is used to provide DC power to the tuner. Between 11 and 15 volts DC can be
used. The power supply must be able to provide up to 0.4 amps for up to two seconds. For portable
operation, two rechargeable 9V batteries in series will provide about 14 volts DC at about 0.120
AHr. With the Z11 drawing about 0.0002 AHr per tune, the user should get about 500 tunes on a
single charge. Do not use regular alkaline 9-volt batteries without regulating the power to below 15
volts.
Notes: Most tuning situations with the Z11 is very straightforward. Simply transmit a continuous
carrier and press the tune button. The tuner will find the best match and stop tuning.
In either mode (Auto or Semi), if power (either RF or +12) is removed after the tuning cycle starts,
but before it finishes, the LEDs will go out and the tuning will stop. The resultant tune will be
undetermined; it may or may not be a match.
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