Bedienungsanleitung Yaesu FT-450D (Seite 76 von 102) (Englisch)

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Page 74 FT-450D OPERATION MANUAL

RTTY

(

RADIO TELETYPE

)

PERATION

Most RTTY operation today is accomplished using a TNC or other computer-based system that utilizes AFSK

tones. For RTTY operation using a Terminal Unit (TU) or the “FSK” output from a TNC, please see the discus-

sion below. See also the illustration for details regarding connection to your TU.

SETTING UP FOR RTTY OPERATION

Before commencing RTTY operation, please direct

your attention to the setup steps shown in the chart

to the right.

BASIC SETUP

1. Press the

[

MODE

]

[

MODE

]

buttons several

times to indicate both the “ ” and “ ” icons

on the display. Engage the RTTY operation us-

ing “LSB” injection, which is generally used in the

Amateur service.

2. When you begin typing on your TU or computer

keyboard, the command to transmit should auto-

matically be sent to the transceiver, causing it to

enter the transmit mode.

NOTE:

If you anticipate making data transmissions of longer

than a few minutes, we recommend that you reduce

the transmitter power to 1/2 ~ 1/3 of its normal maxi-

mum via Menu Item “RFPOWER”.

QUICK POINT:

In the FT-450D, “RTTY” is a mode defined as being

an “FSK” mode, whereby the closing and opening of

a keying line (to ground) causes the Mark/Space tones

to alternate. The RTTY mode is not an AFSK based

mode in this transceiver, and the AFSK output tones

from a TNC will not cause Mark/Space shifting to oc-

cur. Use the “Packet” mode for AFSK-based Baudot

and other data modes.

MENU ITEM

RTY SFT

(

RTTY SHIFT

)

RTY TON

(

RTTY TONE

)

RTYRPOL

(

RTTY RX POLARITY

)

RTYTPOL

(

RTTY TX POLARITY

)

AVAILABLE VALUES

170 / 200 / 425 / 850 Hz

1275 / 2125 Hz

NOR / REV

ADVICE:

 There is no adjustment of the FSK input level

(FSK IN of the DATA jack) on the rear panel;

please make any needed level adjustments at the

TU side.

 The Mark/Space Shift utilized in most Amateur

RTTY operation is 170 Hz. Other shifts may be

configured, however, using Menu Item “RTY SFT”.

The FT-450D is set up for “high tone” operation

(centered on 2125 Hz) by default, but you may

configure it for low tone (1275 Hz) operation us-

ing Menu Item “RTY TON”.

 You may find that you are unable to decode some

RTTY stations, even if they are of sufficient sig-

nal strength. If this is observed, there may be a

Mark/Space polarity problem between your sta-

tion and the other station. If so, try setting Menu

Item “RTYRPOL” to “REV” (“Reverse”) to see if

that permits copy. A separate Menu Item permits

reversal of your transmitter’s Mark/Space polar-

ity: “RTYTPOL.”

IN PTT

FSK

OUT

INPUT

DC 13.8V

22A

ANT

GND

EXT

SPKR

CATLINEARTUNERDATA

N.C.

GND

PTT

FSK OUT

AF IN

N.C.

DATA JACK

DATA IN (Pin 1)

Pin 6

GND (Pin 2)

DATA PTT (Pin 3)

FSK IN (Pin 4)

DATA OUT (Pin 5)

SQL OUT(

)

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