Bedienungsanleitung Yaesu FT-450D (Seite 36 von 102) (Englisch)

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Page 34 FT-450D OPERATION MANUAL

SING

THE

UTOMATIC

NTENNA

UNER

The Automatic Antenna Tuner (hereinafter referred to as the “ATU”) built into each FT-450D is designed to

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-450D.

ADVICE:

 Because the ATU of the FT-450D is located inside the station, it only adjusts the impedance presented to the

transceiver at the station end of your coaxial cable feedline. It does not “tune” the SWR at the antenna feed

point itself. When designing and building your antenna system, we recommend that every effort be made to

ensure a low SWR at the antenna feed point.

 The ATU of the FT-450D includes 100 memories for tuning data. Eleven of these memories are 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-450D is designed to match impedances within the range of 16.7 Ohms to 150 Ohms,

corresponding to an SWR of 3:1 or less on the 160 through 6 meter amateur bands. 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.

ATU OPERATION

1. Use the Main Tuning Dial knob to set the radio to

the desired operating frequency within the Ama-

teur band.

2. Press the [TUNE] button momentarily to place

the ATU in the transmit line (no adjustment/tun-

ing will occur yet). The “ ” icon will appear

in the display.

QUICK POINT:

The momentary press of the [TUNE] button will

turn the tuner on, and the microprocessor will

automatically select the tuning point closest to

the current operating frequency.

3. Press and hold in the [TUNE] button for one sec-

ond to begin automatic tuning. The transmitter

will be engaged, and the “ ” icon will blink

while tuning is in progress. When the optimum

tuning point has been reached, the radio will re-

turn to receive, and the “ ” icon will again

glow steadily (instead of blinking).

4. To disconnect the ATU from the transmit line,

press the [TUNE] button momentarily. The

“ ” icon will turn off, confirming that the ATU

has been turned off. In the “Off” mode, the trans-

ceiver will be directly connected to the coaxial

cable connected to your antenna, and will oper-

ate based on whatever impedance is present at

the station end of the coax.

ADVICE:

The ATU circuit is located between the final amplifier

and the rear-panel antenna jack; reception is not af-

fected by the ATU.

QUICK POINTS:

As shipped from the factory, only one ATU alignment

point is saved on each Amateur band. This was

memorized during the final alignment and perfor-

mance verification stages on the production line.

NOTE:

Please check the operating frequency before begin-

ning the tuning process, to be sure you are not inter-

fering with others who may already be using the fre-

quency.

TERMINOLOGY:

Antenna Tuner Memories: The microprocessor of the

ATU makes a note of the positions of the tuning ca-

pacitors and the selected inductors, and stores the

data for each 10 kHz window in which tuning has

occurred. This eliminates the need to re-tune every

time you return to a frequency on which you have

already completed the tuning process.

[

TUNE

]

button

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