Automatic Antenna Tuner; Presetting - Kenwood TS-570D, TS-570S Instruction Manual

12 OPERATOR CONVENIENCES

AUTOMATIC ANTENNA TUNER

1
As explained in "ANTENNA CONNECTION" {page 1},
matching the impedance of the coaxial cable and
antenna is very important. To do this, you have the
choice of using the internal or an external tuner. This
2
section describes how to use the internal tuner. For the
external tuner, consult the instruction manual that comes
with the tuner.
3
1 Select the transmit frequency.
2 Press [ANT] to select ANT 1 or ANT 2.
• With an external tuner connected to the ANT 1
4 connector, you cannot select ANT 1 here.
Selecting ANT 1 in this situation always causes
the internal tuner to be bypassed.
3 Press [AT TUNE] and release it immediately.
5
• "AT" appears to show that the internal tuner is in-
line (not bypassed).
6
7
4 Press [AT TUNE] for more than one second.
• CW mode is automatically selected and tuning
8
starts.
• "AT" blinks, and "TX" and "CW" appear.
9
10
• To cancel tuning for any reason, press
11
[AT TUNE] again.
• If the SWR of the antenna system is extremely
high, an alarm, Morse code "SWR", is output and
the internal tuner is bypassed. Before retrying
12
tuning, adjust the antenna system to lower the
SWR.
5 See the display and check that tuning has
13 successfully finished.
• After successful tuning, "AT" stops blinking, and
"TX" and "CW" disappear.
• If tuning does not finish within about 20 seconds,
14
an alarm sounds. Press [AT TUNE] to stop the
alarm and tuning.
If you access Menu No. 11 and select ON, received
15 signals will also pass through the internal tuner. This
may reduce interference to the receive frequency.
16
52
Note:
The internal tuner will not tune outside the authorized transmit
limits of Amateur bands.
Pressing [AT TUNE] for more than one second while transmitting
interrupts transmitting and starts tuning.
While using a different antenna tuner band for transmitting and
receiving with Menu No. 11 ON, received signals bypass the
internal tuner.
While using CW Full Break-in, the internal tuner will be in-line for
both transmitting and receiving.
Tuning will automatically turn off after approximately 60 seconds.
In addition, "AT" will disappear and the error beeps will stop.
Tuning still may continue when the SWR meter indicates 1:1.
This happens because of the tuning algorithm, and does not
indicate a malfunction.
Even though the SWR meter shows more than one segment, the
internal tuner may not function for retuning. This does not
indicate a malfunction. It happens because of an unavoidable
SWR calculation algorithm error between 10 W (approx.) transmit
power for tuning and 100 W transmit power.
If tuning does not finish although the SWR meter indicates
smaller than 3:1, adjust the antenna system to lower the SWR,
then retry tuning.
Tuning may not lower the SWR to 1:1 depending on conditions.

PRESETTING

After each successful tuning session, the Preset
function stores the position of the tuning capacitor in
memory. The position of the capacitor is stored for each
of the antenna tuner bands (see table below) and for
each antenna connector (ANT 1 and ANT 2).
Press [AT TUNE] and release it immediately.
• "AT" will appear to show that the internal tuner is in-
line (not bypassed).
• Each time you go across the antenna tuner band,
the Preset function automatically positions the tuning
capacitor without need for retuning. If no Preset
data exists for a particular band/antenna
combination, then the default data for 50
Note: Tuning may restart to obtain the optimum matching condition
although the current antenna tuner band has the preset data. This
does not indicate a malfunction.
Frequency Range
(MHz)
0.03 ~ 1.85
1.85 ~ 2.50
2.50 ~ 3.525
3.525 ~ 3.575
3.575 ~ 3.725
3.725 ~ 4.10
4.10 ~ 7.03
7.03 ~ 7.10
7.10 ~ 7.50
7.50 ~ 10.50
10.50 ~ 14.10
1
TS-570S only
is used.
Frequency Range
(MHz)
14.10 ~ 14.50
14.50 ~ 18.50
18.50 ~ 21.15
21.15 ~ 21.50
21.50 ~ 25.50
25.50 ~ 29.00
29.00 ~ 30.00
1
30.00 ~ 51.00
1
51.00 ~ 52.00
1
52.00 ~ 53.00
1
53.00 ~ 60.00