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User's Manual | ACOM 04AT | Remote Automatic Antenna Tuner and Switch
4.1.4. FIXED
An extreme reduction of the physical dimensions of antennas, such as for a loop of 2-3 m diameter for 80 m
band, would probably limit the capability to operate on a single fixed frequency only. If this is the case, select
FIXED (for fixed frequencies) type. Naturally, you can also make the same choice with more broad-band
antennas, if this is convenient for any other reason. This option is also convenient for reducing the probability
of operating with random settings at specifically set frequencies.
4.2. Tuner Assignment and Unassignment
Tuner assignment and unassignment is done in the USER PREFERENCES menu of the amplifier.
If the top row of the "Antenna tuner/switch installed NO - YES" menu is not selected (if it is shaded), first
select it with the
ITEM or ITEM
To assign the tuner, use the SELECT
and select NO. Leave the menu with the EXIT button.
The amplifier will not provide power to the newly connected tuner until you assign the
tuner as described above.
I.e., without tuner assignment, all antenna outputs will remain grounded and you could
neither transmit nor receive.
The amplifier will automatically unassign the still-assigned tuner if no tuner is detected at
a power-up (e.g., due to disconnected cable, faulty cable, or another failure).
When you reconnect a tuner, you must assign it again as described above.
4.3. Tuning Modes: FULL, QUICK and BYPASS
The tuner can operate in two main modes of tuning: full and quick. In addition, the tuner can be switched to
BYPASS mode, without tuning. This is a non-basic mode, but it can be useful.
- "Full tuning" is the basic cycle for active searching the relays setup for a new frequency and
antenna, see details in Section
- "Quick tuning" passively retrieves information stored in the tuner non-volatile memory of full
tuning settings prepared earlier - see Section
- "BYPASS" mode eliminates the action of the coils and capacitors in the matching network of the
tuner in order to be able to change frequency segments or bands without retuning, e.g., at broad-band or
preset antenna - see Section
used for diagnostics and maintenance of the antenna-feeder path (see Section
the Antenna-feeder Path Status
October 2023
buttons.
button and select YES. To unassign the tuner, use the
5 BASIC FULL TUNING CYCLE
4.4 Quick Tuning and Non-Volatile Memory
4.5 Operation in BYPASS Mode
).
S e c t i o n STARTING UP AND MAIN FUNCTIONS | Page 49 of 88
.
. In addition to operation, the BYPASS mode can be
7.5 Troubleshooting - Monitoring
SELECT button
.
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