(Atas-I00) Operation - Yaesu FT-100D Operating Manual

Active-Tuning Antenna System (ATAS-100) Operation
The optional ATAS-I 00 Active-Tuning Antenna System provides operation on a number
of HF bands (7114/21128 MHz) plus 50 MHz, 144 MHz, and 430 MHz. The FT - 100 pro-
vides microprocessor control of the tuning mechanism in the AT AS-I 00 for convenient
automatic tuning.
Before operation can begin, you must instruct the FT -I OO's microprocessor that the ATAS-
100 is being used. This is done using the MENU:
<D
Press and hold in the [FUNC] key for Y2 second to activate the MENU mode.
<D
Rotate the SELECT knob to recalJ MENU #61 (TUNER/ATAS).
Q)
The default setting for this MENU item is "Off."
Rotate the MAIN DIAL to change
the setting to "AtAS-1" if you are using the ATAS- 100 for alJ bands (you must
connect an external diplexer to combine the two antenna ports so as to use the
ATAS- 100 on alJ bands). Or make the setting "AtAS-2" if you are just using the
ATAS-IOO on
7~50 MHz, with a dual-band VHF/UHF antenna connected sepa-
rately to the 144/430 MHz antenna port.
®
Press the [FUNC] key momentarily to save the new setting and exit to normal op-
eration.
AUTOMATIC TUNING
I. Press the [FUNC] key, as needed, to recalJ Operating Function Row 7 [MTR, TUN,
PRO, VOX].
2. Press the [B](TUN) key to tum the ATAS-I 00 on (this action only supplies voltage to
the antenna at this point; re-tuning does not begin). The "TUN" icon will become Bold.
3. Now press and hold in the [B](TUN) key for Y2 second to initiate ATAS-100
tuning. The transmitter will automatically be activated, a carrier will be sent,
and the antenna's length will be adjusted for best SWR. .. , ......
4. If the microprocessor determines that the antenna's length is radically incor-
! . . ! !"' ! !
"TUNING"
rect from the optimum value, no carrier will be sent out. Instead, in the re-
ICON
ceive mode, the antenna will retract to its shortest position (this may take up to one
minute). While this is happening, do not press the [B](TUN) key again. When the
AT AS-I 00 reaches its minimum length, automatic tuning will be initiated, and the trans-
mitter will automatically shut off when a satisfactory SWR is achieved.
~
tuning process. SWR will be satisfactory when the antenna is fully re-
' _ ' ',/ On the 144 MHz and 430 MHz bands, the
ATAS-IOO
does not require a
/ "d - tracted.
5. When you wish to conclude ATAS-J 00 operation, press the [B](TUN) key so that the
"TUN" icon will revert to its normal (non-Bold) state.
62
FT-JOO
MICRO MOBILE OPERATING MANUAL