Automatic Antenna Tuner; Presetting (Internal Tuner Only) - Kenwood TS-870S Instruction Manual

7 OPERATING AIDS
INTERNAL TUNER
Note: Setting Menu No. 33 (TUN. WIDE} to OFF tc select an
SWE s 7.2:1 reduces internal tuner josses. This setting is best.
1 Press [THRU/AUTO].
» * AT-TX" lights. If Menu No. 08 (RX AT) is ON,
then "- AT — TX RX" ights indicating that the
tuner is in-line while transmitting and receiving.
In this case, prior to tuning in Step 2, received
signals are attenuated and the receiver sensitivity
is lowered.
AUTOMATIC ANTENNA TUNER
You nave the choice of using the internal tuner, an
external AT-300 tuner, or bath.
Note:
* = The antenna tuners will not tune outside the authorized transit
Jimits of Amateur bands.
« if an external AT-300 tuner is connected, the internal tuner is
bypassed when the ANT 1 connector is selected. The AT-300
cannot be used with the ANT 2 connector.
@ = When tuning in CW mode, the SWR meter may deflect upscale
momentarily. This is not a fault.
@ fusing Full Break-in CW, the interna! antenna tuner can be
bypassed completely ar can be in-line for both transmitting and
receiving. Even when OFF is selected via Menu No. 06 (RX AT),
received signals pass through the antenna tuner. To protect the
antenna tuner relay, the tuner cannot be used only for
vansmitting.
asc aso
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+ Ifthe tuner has not adjusted itself yet for the
PRESETTING (INTERNAL TUNER ONLY)
selected frequency, then AT TUNE lights, and
Preset tuning begins. Signals pass through the
antenna tuner during this time. If Menu No. 08
(RX AT) is OFF, the antenna tuner is bypassed.
The AT TUNE light goes out when presetting is
completed. You cannot transmit while presetting
is in progress.
After each successful tuning session, the Preset
function stores the data for the position of the tuning
capacitors on each band. Then, if the frequency is
changed while the interna! tuner is switched ON, this
function automatically positions the capacitors without
need for retuning. After changing bands, the Preset
function activates for the newly selected band.
A different set of data is stored for each of the
18 antenna tuner bands (see table) and for each
antenna connector (ANT 1 and ANT 2}. Therefore,
Cie] ATTUNE
enabling the other antenna connector by pressing the + If Preset data exists, the next step cannot be
[ANT] button may also cause the Preset function to done unti the transceiver completes the Preset
activate. If no Preset data exists for a particular band/ tuning.
antenna combination, then the default data for 50 Q is 2 Press [AT TUNEL.
. P : a To cancel tuning for any reason, press
Presetting does not activate while transmitting. For
split-band operation, even if Menu No. 08 (RX AT) is {THRU/AUTO] or [AT TUNE].
ON, the antenna tuner is bypassed while receiving. + If the Preset tuning is aborted by pressing
Also, at all times, presetting is only done for transmit [AT TUNE}, the new temporary data will be used,
frequencies. but this new data does not update the stored
Preset data. Also, the new temporary data will be
lost if the operating band is changed. Return to
the stored Preset data by pressing
[THRU/AUTO] OFF and then ON again.
PRESET BANDS FOR INTERNAL TUNER
+ AT TUNE lights and stays lit while the tuner
tunes. When the light goes out, the tuner has
0.030 ~ 1.85
10 7.49 ~ 10.48
successfully matched the transceiver to the
2
1.85 ~ 2.01
11!
10.49 ~ 14.1
antenna system with an SWR less than the value
|
set in Menu No. 33 (TUN.WIDE}.
You can begin
3 |
2.01 ~ 3.625 12}
14.1 ~ 14.49
operating.
4) 3525~3.575
| 18 | 14.49 ~ 20.99
+ Hf tuning doesn' finish within about 20 sec, an
| 3575 ~3.725 14
20.99 ~ 21.15
alarm sounds. You may stop the alarm and the
a
tuning by pressing [AT TUNE]. The alarm can be
8
3.725 ~ 4.49
15 | 21.15 ~ 21.99
either a triple beep or the Morse code "CHECK"
7
4.49 ~ 7.03 16
21.99 ~ 25.49
Sting.
on the Menu No. 37 (WARN. BP}
~
7
~
,
;
8 L
7.03 > 71 \
25.49 ~ 29
»
After each successful tuning, the Preset data is
9: 7.1 ~ 7.49 18 29 ~ 30 updated.
Note: The lower limit is inside the band in each case: the higher Note:
limit ts inside the next higher band. For example, 14.1 MHz 's in
Band 12 whereas 14.49 MHz is in Band 13 (exception: 30 MHz is in
Bang 18).
* While receiving with Menu No. 08 (RX AT) ON on
frequencies outside the Amateur bands, sensitivity is
lowered.
it's a. good practice tc press [AT TUNE] after changing bands
to ensure the tuner has tuned for minimum SWA.
49