Page 66
FT
DX
1200 O
PERATING
M
ANUAL
A
BOUT
ATU O
PERATION
Figure 1 depicts a situation where normal tuning via the
$
TU has been successfully completed, and the tuning data has
been stored in the
$
TU memory. The antenna system as seen by the transmitter is shown.
In Figure
, the operator has changed fre
T
uency, and the “
HI-SWR
” icon has appeared. The operator presses and holds
in the [
TUNE
] button for two seconds to begin impedance matching using the
$
TU.
If a high SW
5
condition exists
above 3
1), corrective action must be taken in the antenna system to bring the imped-
ance closer to
0
2
hms. The
$
TU will refuse to memori
]
e settings on fre
T
uencies where the SW
5
exceeds 3
1.
$
High
SW
5
may indicate a mechanical failure in the feed system, and can lead to the generation of spurious signals causing
TVI, etc.
About ATU Memories
SWR (After tuning) Less than 1.5:1
The tuner settings are stored in the
$
TU memory.
SWR (After tuning) Greater than 1.5:1
Tuning data will not be retained in memory. If you return to the same fre
T
uency, the tuning process must be re-
peated.
SWR (After tuning) Greater than 3:1
The “
HI-SWR
” icon will light up, and the tuner settings, if achieved, will not be memori
]
ed.
3
lease investigate
the high SW
5
condition and resolve the problem before attempting further operation using this antenna.
U
SING
THE
A
UTOMATIC
A
NTENNA
T
UNER
F
IGURE
1
F
IGURE
2
Feed Point SWR
SWR: 3.0
Retuned Setting
Memorized ATU Tuning
The “HI-SWR” icon appears on the display
when you transmit on the frequency
SWR after ATU Tuning
Frequency
Frequency
