Using The Automatic Antenna Tuner; Atu Operation - Yaesu FT DX 9000 CONTEST Operation Manual

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SING THE SING SING THE THE THE UT UT UT UT UT OMA OMA OMA OMA TIC TIC TIC TIC TIC
SING SING THE OMA
The Automatic Antenna Tuner (hereinafter referred to as the "ATU") built into each FT
ensure a 50-Ohm load for the final amplifier stage of the transmitter. We recommend that the ATU be used whenever you
operate on the FT 9000 Contest.
DX
The ATU of the FT
DX
the transceiver at the station end of your coaxial cable feedline. It does not "tune" the SWR at the antenna
feedpoint itself. When designing and building your antenna system, we recommend that every effort be made to
ensure a low SWR at the antenna feedpoint.
The ATU of the FT
DX
allocated, one per Amateur band, so that each band has at least one setting preset for use on that band. The
remaining 89 memories are reserved for the 89 most-recent tuning points, for quick frequency change without
the need to retune the ATU.
The ATU in the FT
DX
Ohms, corresponding to an SWR of 3:1 or less. Accordingly, simple non-resonant whip antennas, along with
random-length wires and the "G5RV" antenna (on most bands) may not be within the impedance matching
range of the ATU.
1. Rotate the [ RF PWR ] control fully clockwise (to the
right).
2. Use the [ Main Tuning Dial ] knob to set the radio to
desired operating frequency within the Amateur band.
3. Press the [ TUNE ] switch momentarily to place the
ATU in the transmit line (no adjustment/tuning will
occur yet). An LED inside the [ TUNE ] switch will
glow red continuously.
Q P
UICK OINT
The momentary press of the [ TUNE ] switch will turn
the tuner on, and the microprocessor will automati-
cally select the tuning point closest to the current op-
erating frequency.
4. Press and hold in the [ TUNE ] switch for two seconds
to begin automatic tuning. The transmitter will be en-
gaged, and the red LED imbedded in the [ TUNE ]
switch will blink while tuning is in progress. When
the optimum tuning point has been reached, the radio
will return to receive, and the red LED will again glow
steadily (instead of blinking).
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9000 Contest, being located inside the station, only adjusts the impedance presented to
9000 Contest includes 100 memories for tuning data. Eleven of these memories are
9000 Contest is designed to match impedances within the range of 16.5 Ohms to 150
ATU O
[ TUNE ] Switch
[ Main Tuning Dial ] Knob
[ RF PWR ] Knob
UNER UNER UNER
UNER UNER
DVICE
PERATION
"HI SWR" ( LED glows Red )
5. While tuning around the band using the Main tuning
dial, you will observe that the [ TUNE ] LED blinks
momentarily every 10 kHz. This momentary blinking
indicates that a new tuning window has been entered.
If you want to save tuning data associated with this 10
kHz window, repeat step 4 (above) for each such win-
dow. On bands like 1.8 MHz where the impedance
may change rapidly, the storage of a number of tuning
points is recommended.
6. To disconnect the ATU from the transmit line, press
the [ TUNE ] switch momentarily. The red LED im-
bedded in the [ TUNE ] switch will go out, confirming
that the ATU has been turned off. In the "Off" mode,
the transceiver will be directly connected to the co-
axial cable connected to your antenna, and will oper-
ate based on whatever impedance is present at the sta-
tion end of the coax.
FT 9000 C
DX
9000 Contest is crafted to
DX
VDD BIAS TEMP SWR
O M
ONTEST PERATION ANUAL