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4.4. Quick Tuning and Non-Volatile Memory
Quick tuning is performed automatically at each change of frequency segment, band and/or antenna. The
tuner checks if there is a stored tuning setting for the desired frequency and antenna in the non-volatile
memory. If there is none, the tuner automatically stays in BYPASS mode and the amplifier displays the
warning message:
If there is a stored setting, the tuner reads the relay combination settings from its nonvolatile memory and
immediately performs it by switching all relays in one step (and if necessary, switches the antenna as well)
without any emission. The amplifier refreshes its indication - the new frequency segment is enclosed in a thin
orange frame on the frequency range, "Memory settings" is displayed in front of the numerical segment
boundaries and the number, type, and name of the antenna in use are updated. At this moment the amplifier
is ready for transmission.
If the tuning found in memory is too old, the alarm message
is displayed (see Section
used. If the operator wants to refresh it, he can immediately start a new full tuning cycle and the data in the
non-volatile memory will be refreshed and the message will disappear.
If there is no tuning setting stored in the memory, the tuner automatically stays in BYPASS mode and the
operator can proceed in either of the following ways:
- Start a full tuning cycle by briefly pressing the TUNE button (see Section
);
CYCLE
- Change the frequency and/or antenna to find a stored tuning setting from the tuner nonvolatile
memory.
Organization and use of the tuning settings memory
We recommend preparing custom tuning settings for the frequencies and antennas that will be used most
frequently. They will be automatically stored in the tuner memory, and automatically retrieved when a
frequency and/or antenna is changed.
The tuner memory is divided into four large groups - one per each antenna number. Each group is additionally
divided into 4 subgroups for the four degrees of selectivity (Sharp, Regular, Wide and Fixed). The number of
segments in each band increases with selectivity (sharpness degree - S, R, W, F, see Section
type / Rate (Selectivity Degree, Sharpness)
frequency, aiming same relative coverage on all bands (narrower at the LF end and wider at the HF bands).
Retrieving tuning settings from the memory is much faster than the main cycle of full tuning, with no
emissions of RF power. However, in the meantime the antenna may have changed its parameters to a smaller
or larger degree, so an old tuning may be ineffective and may need to be refreshed through a new cycle of
full tuning.
Page 50 of 88 | S e c t i o n STARTING UP AND MAIN FUNCTIONS
User's Manual | ACOM 04AT | Remote Automatic Antenna Tuner and Switch
ATU FULL TUNING REQUIRED.
TUNING OUTDATED
6.2.8 Aging and Refreshing of Settings
). For each of the four degrees the segments width increases with
), but the outdated tuning setting can still be
5 BASIC FULL TUNING
4.1 What is tuning
October 2023
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