Using The Automatic Antenna Tuner; Atu Operation - Yaesu FTDX9000MP 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
Ohm load for the final amplifier stage of the transmitter. We recommend that the ATU be used whenever you operate on the
FT 9000MP.
DX
The ATU of the FT
DX
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
one per Amateur band, so that each band has at least one setting preset for use on that band. The remaining 89
memories are reseved for the 89 most-recent tuning points, for quick frequency change without the need to
retune the ATU.
The ATU in the FT
DX
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.
[TUNE] Switch
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.
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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 reched, the radio
will return to receive, and the red LED will again glow
steadily (instead of blinking).
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9000MP, being located inside the station, only adjusts the impedance presented to the
9000MP includes 100 memories for tuning data. Eleven of these memories are allocated,
9000MP is designed to match impedances within the range of 16.5 Ohms to 150 Ohms,
ATU O
[RF PWR] Knob [Main Tuning Dial] Knob
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PERATION
[HI SWR] LED
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 9000MP O
DX
9000 is crafted to ensure a 50-
DX
VDD BIAS TEMP SWR
M
PERATION ANUAL