Bedienungsanleitung Yaesu FTDX1200 (Seite 67 von 140) (Englisch)

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Page 65

1200 OPERATING MANUAL

The $utomatic $ntenna Tuner hereinafter referred to as the “$TU”) built into each

1200

is designed to ensure a

0-2hm load for the ¿nal ampli¿er stage of the transmitter. We recommend that the $TU be used whenever you operate

on the

1200

DVICE:



Because the $TU of the

1200

is located inside the station, it only adjusts the impedance presented to the trans-

ceiver at the station end of your coaxial cable feedline. It does not “tune” the SW5 at the antenna feed point itself.

When designing and building your antenna system, we recommend that every effort be made to ensure a low SW5

at the antenna feed point.



The $TU of the

1200

includes 100 memories for tuning data. (leven of these memories are allocated, one per

$mateur band, so that each band has at least one setting preset for use on that band. The remaining 8 memories are

reserved for the 8 most-recent tuning points, for Tuick freTuency change without the need to retune the $TU.



The $TU in the

1200

is designed to match impedances within the range of 16. 2hms to 10 2hms, cor-

responding to an SW5 of 31 or less on the 160 through 6 meter amateur bands. $ccordingly, simple non-resonant

whip antennas, along with random-length wires and the “G5V” antenna on most bands) may not be within the im-

pedance matching range of the $TU.

ATU OPERATION

USING THE AUTOMATIC ANTENNA TUNER

1. Use the 0ain Tuning 'ial knob to set the radio to

the desired operating freTuency within the $mateur

band.

. 3ress the

[

TUNE

]

button momentarily to place the

$TU in the transmit line no adjustmenttuning will

occur yet). The “

TUNER

” icon will appear in the

display.

UICK POINT:

The momentary press of the

[

TUNE

]

button will turn

the tuner on, and the microprocessor will automati-

cally select the tuning point closest to the current

operating freTuency.

3. 3ress and hold in the

[

TUNE

]

button for one second

to begin automatic tuning. The transmitter will be en-

gaged, and the “

TUNER

” icon will blink while tun-

ing is in progress. When the optimum tuning point

has been reached, the radio will return to receive,

and the “

TUNER

” icon will again glow steadily in-

stead of blinking).

4. To disconnect the $TU from the transmit line, press

the

[

TUNE

]

button momentarily. The “

TUNER

”

icon will turn off, con¿rming that the $TU has been

turned off. In the “2ff” mode, the transceiver will be

directly connected to the coaxial cable connected to

your antenna, and will respond to whatever imped-

ance is present at the station end of the coax.

DVICE:

The $TU circuit is located between the ¿nal ampli¿er

and the rear-panel antenna jack reception is not affected

by the $TU.

QUICK POINTS:

$s shipped from the factory, only one $TU alignment

point is saved on each $mateur band. This was memo-

ri]ed during the ¿nal alignment and performance veri¿-

cation stages on the production line.

OTE:

3lease check the operating freTuency before beginning

the tuning process, to be sure you are not interfering

with others who may already be using the freTuency.

ERMINOLOGY:

$ntenna Tuner 0emories The microprocessor of the

$TU makes a note of the selected tuning capacitors and

inductors, and stores the data for each 10 kH] window

in which tuning has occurred. This eliminates the need

to re-tune every time you return to a freTuency on which

you have already completed the tuning process.

[

TUNE

]

Button

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