14
When the SWR is above 1.5:1, the AATU stops at the best SWR achieved, so you could check whether it would be
acceptable for your transceiver as a last resort (usually if below 2:1). We recommend, however, to make a correction
or repair the antenna when needed, in order to improve its SWR.
Although the AATU is capable to match a much wider than the guaranteed impedance range, it is advisable that the
antenna SWR be included in the range where the AATU matching capability is specified (see S.6-1,e).
C A U T I O N
If you give an
AUTO TUNE
command while RF is presently applied, you will see a
“
Stop RF …”
message and the operation will be rejected. Just stop transmitting,
place the amplifier to bypass (STBY), and repeat the command.
C A U T I O N
If you occasionally interrupt the tuning power while the
AUTO TUNE
process is
being executed, you will see a message “
Unstable RF Power”
. Just repeat the
command.
N O T E
You can start the
AUTO TUNE
procedure directly from the main menu, as well as
when either OPERATE, STATUS, or SWR-CHK function is active. You cannot start
AUTO TUNE
from BYPASS function. You will note that the
AUTO TUNE
button
becomes dark while it is inoperative.
If you press the button
Enter
for the second time while in OPERATE, you will start the Memory sub-function which is
explained in the next section. To exit, press the button
Esc
repeatedly until the main menu appears.
4-2. Using the Memory
This is a sub-function of the function OPERATE. To select it, while in OPERATE press the button
Enter –
you will
see the function inscription:
Mode: Memory *12d
6970-7110
.
a) Indication.
To the right on the upper line is shown the current memory-cell number. The characters in front and behind the
number can be missing as explained below.
If the memory cell appears marked with an asterisk
*
in front of the number, this means that the cell contents is in
effect and it is identical with the tuning (relay settings) in the remote unit. If the asterisk is not present there, you are
only looking at the cell contents (frequency segment), however it is not active. This means that the current relay
status of the remote unit is different from what is written in the memory for that frequency segment.
If the letter “
d”
is shown behind the cell number, this means that this memory cell has been selected by the operator
to be used as default setting at a power on. The selection method is described below.
The bottom row is intended to indicate the frequency segment the tuning has been written about in the memory cell
shown. If no numbers are present on this line but only a “---------“ appears, the current cell has been still not used.
b) Buttons operation.
The following commands are available for memory operation:
-
using the buttons
<
or
>
you can decrease or increase the memory-cell number. You can look up the list of the
frequency segments stored with a tuning in various memory-cells (or only the part of interest). The remote-unit
relay status is not being changed while you are listing the memory unless you activate either cell contents.
-
If you press and hold the button
Ent,
you will get access to the three commands that you can use concerning the
currently displayed memory cell. The following screen will prompt you to give a command:
Mode: Memory *12d
DEF RCL STO .
Command abbreviations appear at the top of the three buttons from the left, namely:
