Yaesu FT DX 9000 Operation Manual - Rtty O

Page 123

FT

DX

9000 C

ONTEST

 O

PERATION

 M

ANUAL

 R R R R RTTY 

TTY 

TTY 

TTY 

TTY (RRRRR

ADIO

ADIO

ADIO

ADIO

ADIO

     TTTTT

ELE

ELE

ELE

ELE

ELE

TTTTT

YPE

YPE

YPE

YPE

YPE

) O O O O O

PERA

PERA

PERA

PERA

PERATION

TION

TION

TION

TION

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

such, the previous discussion on LSB-mode “Packet” operation will apply for Baudot operation, as well. For RTTY

operation using a Terminal Unit (TU) or the “FSK” output from a TNC, please see the discussion below. See also the

illustration for details regarding connection to your TU.

S

ETTING

 U

P

FOR

 RTTY O

PERATION

1. Press the [RTTY] Mode switch to enter the RTTY

mode.

A

DVICE

ˆ One press of the [RTTY] Mode switch will engage

RTTY operation using “LSB” injection, which is

generally used in the Amateur service. In this mode,

both the “RTTY” and “LSB” LEDs will light up.

ˆ To switch to USB-side injection in RTTY, press

the [RTTY] mode switch once more. Both the

“RTTY” and “USB” LEDs will now be illumi-

nated. Repeatedly pressing the [RTTY] button will

toggle between LSB and USB injection on RTTY.

2. When you begin typing on your TU or computer key-

board, the command to transmit should automatically

be sent to the transceiver, causing it to enter the trans-

mit mode.

FSK OUT

PTT

AF IN

①

④

③

②

RTTY

RTTY JACK

RTTY Machine

Pin 1

Pin 2

Pin 3

Pin 4

AF IN

PTT

GND

FSK OUT

2

1

Before commencing RTTY operation, please direct your

attention to the setup steps below.

B

ASIC

 S

ETUP

A

DVICE

ˆ There is no adjustment of the receiver output

level from Pin 1 (“RX OUT”) of the RTTY jack

on the rear panel; please make any needed level

adjustments at the TU side.

ˆ The Mark/Space Shift utilized in most Ama-

teur RTTY operation is 170 Hz. Other shifts

may be configured, however, using Menu item

“MODE-RTY  075 RTTY SHIFT.”

ˆ The FT 

DX

 9000 Contest is set up for “high

tone” operation (centered on 2125 Hz) by de-

fault, but you may configure it for low tone

(1275 Hz) operation using Menu item “MODE-

RTY 076 RTTY TONE.”

ˆ You may find that you are unable to decode

some RTTY stations, even if they are of suffi-

cient signal strength. If this is observed, there

may be a Mark/Space polarity problem between

your station and the other station. If so, try set-

ting Menu item “MODE-RTY 073 POLAR-

ITY-R” to “REV” (“Reverse”) to see if that

permits copy. A separate Menu item permits re-

versal of your transmitter’s Mark/Space polar-

ity: “MODE-RTY 074 POLARITY-T.”

M

ENU

 M

ODE

MODE-RTY 073 POLARITY-R

MODE-RTY 074 POLARITY-T

MODE-RTY 075 RTTY SHIFT

MODE-RTY 076 RTTY TONE

S

ETUP

NOR/REV

NOR/REV

170 Hz

2125 Hz

N

OTE

If you anticipate making data transmissions of

longer than a few minutes, we recommend that you

use the [RF PWR] control to reduce the transmit-

ter power to 1/2 ~ 1/3 of its normal maximum.

Q

UICK

 P

OINT

In the FT 

DX

 9000 Contest, “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

occur. Use the “Packet” mode for AFSK-based Baudot and other data modes.