Kenwood TS-480SAT User Manual download pdf (Page 50)

SPECIALIZED COMMUNICATIONS

RADIO TELETYPE (RTTY)

RTTY is the data communications mode with the

longest history. It was originally designed for use with

mechanical teletypewriters which were often used

before personal computers became common. Now

you can easily start operating RTTY with a personal

computer and MCP. Unlike Packet, each time you

type a letter, it is transmitted over the air. What you

typed is transmitted and displayed on the computer

screen of the recipient.

RTTY operation uses frequency shift keying (FSK)

and the 5-bit Baudot code or the 7-bit ASCII code to

transmit information.

For the cable connections, refer to “RTTY

OPERATION” {page 77}.

For further information, consult reference books

about Amateur Radio.

1 Access Menu No. 41 and select an FSK shift.

• FSK shift is the difference in frequencies

between a mark and a space.

• The 170 Hz shift (default) is normally used on

the Amateur bands for the RTTY.

2 Access Menu No. 42 and select a key-down

polarity.

• Select “oFF” (default) to transmit a mark when

keying down or “on” to transmit a space.

3 Access Menu No. 43 and select “2175” (high tone)

or “1275” (low tone) for mark.

• High tone (default) is commonly used

nowadays.

4 Select an operating frequency.

5 Press [MODE] to select FSK mode {page 19}.

• If necessary, access Menu No. 47 to configure

the appropriate audio output level for your

MCP. The audio output level of ANO

(REMOTE connector/ pin 5) changes

{page 78}. The AF control cannot be used to

adjust the audio level for your MCP.

6 Some stations may be operating in Reverse shift.

In this case, press [MODE] (1 s) to reverse the

shift (the upper sideband is used).

• “FSR” appears.

•Traditionally, the lower sideband is used for

FSK operation. Press [MODE] (1 s) again to

return to the lower sideband. “FSK” appears.

7 Follow the instructions provided with your MCP

and enter a command from your computer to

transmit.

• The LED changes from green (RX) to red (TX).

8 Begin sending data from your computer.

•Press [PWR/ 4/ TX MONI] (1 s) to monitor your

signals. Press [PWR/ 4/ TX MONI] (1 s) again

to quit this function.

9 When finished transmitting, enter a command from

your computer to return to reception mode.

• The LED changes from red (TX) to green (RX).

The following frequencies (measured in kHz)

commonly used for RTTY operation:

adanaC/.A.S.U

1noigeRURA

)acirfA/eporuE(

0481~00812481~8381

)0953:XD(5463~50630263~0853

)0407:XD(0017~08075407~5307

05101~0410105101~04101

5.99041~070415.99041~08041

01181~0018190181~10181

00112~0701202112~08012

03942~0294292942~02922

05182~0708205182~05082

Note:

The TS-480 transceiver utilizes the DSP IC to generate a

variety of the required audio tones for RTTY operation (AFSK).

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Kenwood TS-480SAT User Manual Page 50

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