Acom AOM 04AT User Manual page 55

User's Manual | ACOM 04AT | Remote Automatic Antenna Tuner and Switch
- Adjust the RF power of the transceiver to approximately 25 W (unless previously adjusted). You
may apply more power to compensate RF losses if the coaxial cable to the tuner is too long.
Never exceed 50 W during tuning as described above!
- Transmit a short pulse so that the amplifier can measure the new frequency, automatically select
its new frequency band and, possibly, a new antenna as per the assignment in the ANTENNA
ASSIGNMENTS menu (see Section
- 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), see Section
6.1 ANTENNA ASSIGNMENT Menu
- 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:
- In this state, the tuner will wait for up to 30 s for the operator to transmit a non-modulated signal
(carrier frequency only) of power between 20 W and 30 W with the required frequency for tuning;
- Unless power is applied within 30 s, a message will be received that the waiting period has expired
and the procedure will be automatically terminated:
- 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;
- The proper tuning process starts automatically after the power stabilizes and remains at
approximately 25 W. "Matching cycle..." is then displayed in front of the numerical boundaries of
the indicated segment;
- The tuning process is completely automated and may continue up to 5 s (depending on the
frequency and impedance connected to the antenna output);
- When tuning is complete, the amplifier prompts the operator to stop transmitting:
After the drive power is removed, the frequency range with the tuner segments is refreshed on the amplifier
screen, and a message is displayed in front of the numerical boundaries of the current segment:
If for any reason a good tune is not achieved, a message is displayed instead:
October 2023
NOTICE
6.1 ANTENNA ASSIGNMENT Menu
;
APPLY 20-30 W RF;
TIMEOUT EXPIRED - INCOMPLETE PROCESS;
TUNING COMPLETED: STOP DRIVE POWER.
ATU MATCHED
NO MATCH FOUND
S e c t i o n BASIC FULL TUNING CYCLE | Page 55 of 88
);