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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 type 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 cable connections, refer to “RTTY OPERATION” {page 68}.

For further information, consult reference books about Amateur Radio.

1Access Menu No. 44 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.

2Access Menu No. 45 and select a key-down polarity.

•Select “oFF” (default) to transmit a mark when keying down or “on” to transmit a space.

3Access Menu No. 46 and select “2175” (high tone) or “1275” (low tone) for mark.

•High tone (default) is commonly used nowadays.

4Select an operating frequency.

5Press [CW/FSK (REV)] to select FSK mode.

•“FSK” appears.

•If necessary, access Menu No. 67 to configure the appropriate audio output level for your MCP. The audio output level of ANO (ACC2 connector/ pin 3) changes {page 65}. The AF control cannot be used to adjust the audio level for your MCP.

6Some stations may be operating in Reverse shift. In this case, press and hold [CW/FSK (REV)] to reverse the shift (the upper sideband is used).

•“FSR” appears.

•Traditionally, the lower sideband is used for FSK operation. Press and hold [CW/FSK (REV)] again to return to the lower sideband. “FSK” appears.

7Follow the instructions provided with your MCP and enter a command from your computer to transmit.

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

8Begin sending data from your computer.

•Press and hold [PWR (TX MONI)] to monitor your signals. Press and hold [PWR (TX MONI)] again to quit this function.

9When finished transmitting, enter a command from your computer to return to reception mode.

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

The following frequencies (measured in kHz) are commonly used for RTTY operation:

U.S.A./ Canada		IARU Region 1
		(Europe/ Africa)
1800	~ 1840	1838	~ 1842
3605 ~ 3645 (DX: 3590)		3580	~ 3620
7080 ~ 7100 (DX: 7040)		7035	~ 7045
10140	~ 10150	10140	~ 10150
14070 ~ 14099.5		14080 ~ 14099.5
18100	~ 18110	18101	~ 18109
21070	~ 21100	21080	~ 21120
24920	~ 24930	22920	~ 24929
28070	~ 28150	28050	~ 28150

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PSK31 is a digital modulation method used in amateur radio communications. You can perform data communications in real-time using a keyboard, like RTTY. Additionally, because of the narrow bandwidth (31.25 Hz) you can even use PSK31 on congested frequencies. Another merit to PSK31 is that it can be enjoyed with a simple antenna and low transmit power.

Using the sound function of your PC along with PSK31 software, many amateur radio operators enjoy PSK31.

•Refer to “TNC AND MCP” {page 69} for connections.

•When managing PSK31 using the sound capability of a PC, use SSB mode.

•Set AGC to fast.

•Turn off the speech processor.

•Refer to “EXTERNAL AUDIO SETTINGS” {page 58} for Audio Settings.

For further information, consult reference books about Amateur Radio.

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