Yaesu FT-100D Operating Manual page 65

Active-Tuning Antenna System (ATAS-100) Operation
MANUAL TUNING
In some instances, the SWR may be slightly improved by manual adjustment of the an-
tenna position. This may be needed for operation on bands like 17 meters, where the "Q"
of the ATAS-IOO is high, causing a narrow resonance range.
Before Manual Tuning, press the [FUNC] key, as needed, to recall Operating Function
Row 7 [MTR, TUN, PRO, VOX], then press the [A](MTR) key to change the ALe meter to
the SWR meter ("MTR" icon will become Bold).
To tune the ATAS-IOO manually, press and hold in the microphone PTT switch. With the
transceiver in the "Transmit" mode, press and hold in the [UP] key (to raise the antenna) or
the [OWN] key (to lower the antenna). While you hold in one of these keys, the FT -100
will generate a carrier, and you may watch the top scale of the FT-I OO's meter, looking for
the meter indication to reach its minimum value. When this is reached, release the [UP] or
[OWN] key, then release the PTT key to return to the "Receive" mode.
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change frequency by at least 10 kHz before attempting automatic match-
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0 Once automatic matching has been successfully accomplished, you must
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. . - ing again. Within a window of
±1
0 kHzfrom a match point, the transceiver 5
microprocessor will ignore any command to attempt automatic matching.
o
Antenna tuning is accomplished using a "CW" carrier, although the mode indica-
tion will not change to "CW" (if you are operating on another mode) during an-
tenna tuning.
o
If you see a "HI SWR" /con on the LCD, it may mean that there is a
problem in your coaxial cable (bad connection, etc.) which is preventing
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successful tuning. Replace the cable, or try adding a few feet/meters of .
cable (to eliminate the possibility of adverse "transformer action" in the
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td
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"HISWR"
50n cable during the tuning process).
ICON
o
If
you are able to achieve an SWR of less than 2: 1 via manual tuning, the FT-I00
will "accept" the manual setting, and you may then re-tune automatically when
changing bands.
o
If, however, you stop manual tuning at a non-optimum setting (SWR
>2: 1),
the FT-
100 will not permitfurther automatic tuning. To refresh the setting of the ATAS-100,
press the
[OWN]
key until the ATAS-100 will fully retract. You may then restart
automatic tuning per the procedures described earlier.
o
Although the ATAS-100 is not specifiedfor use on the 10,18, and 24 MHz bands, it
usually is possible to achieve a satisfactory SWR on these bands. Please feel free to
experiment on these bands, if you like.
FT-IOO
MICRO MOBILE OPERATING MANUAL
63