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Transmit a short pulse so that the amplifier can measure the new frequency, au-
tomatically select its new frequency band and, possibly, a new antenna as per the
assignment in the ANTENNA ASSIGNMENTS menu (S. 6.1).
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Change immediately the antenna, if another antenna is required (if there is more
than one antenna assigned for the selected band in the ANTENNA ASSIGNMENTS
menu (S. 6.1).
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When the operating frequency and antenna settings are complete, the operator
should briefly press the TUNE button of the amplifier to start a full tuning cycle. The
amplifier will prompt him to apply RF power for tuning: APPLY 20-30W RF.
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In this state, the tuner will wait for up to 30s for the operator to transmit a non-mod-
ulated signal (carrier frequency only) of power between 20W and 30W with the re-
quired frequency for tuning.
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Unless power is applied within 30s, a message will be received that the waiting
period has expired and the procedure will be automatically terminated: TIMEOUT EX-
PIRED – INCOMPLETE PROCESS.
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For normal tuner operation, the operator will transmit and adjust power with the
current level of the transmitted power being indicated with a green mark on a smaller
scale under the frequency range of the segments. The aim is to get the pointer to the
center of the scale.
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The proper tuning process starts automatically after the power stabilizes and re-
mains at approximately 25W. "Matching cycle..." is then displayed in front of the nu-
merical boundaries of the indicated segment.
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The tuning process is completely automated and may continue up to 5s (depend-
ing on the frequency and impedance connected to the antenna output).
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When tuning is complete, the amplifier prompts the operator to stop transmitting:
TUNING COMPLETED: STOP DRIVE POWER.
After the drive power is removed, the frequency range with the tuner segments is re-
freshed on the amplifier screen, and ATU Matched is displayed in front of the numer-
ical boundaries of the current segment. If for any reason a good tune is not achieved,
No match found is displayed instead.
6. ADVANCED FUNCTIONS AND OPTIONS OF THE TUNER
6.1 ANTENNA ASSIGNMENT MENU
In this menu, the operator can specify the name, type (degree / rate of selectivity) for
each antenna and frequency bands to be used with it.
On the screen, the antenna atributes row selected for editing is enclosed in a color
frame. The next antenna (row) is selected by pressing the two
multaneously.
By pressing the ESC button you will leave the ANTENNA ASSIGNMENTS menu and
the current state of the table will be accepted.
32
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EDIT
buttons si-
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