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7 SPECIALIZED COMMUNICATING
DIGITAL OPERATION
Since Multimode Communications Processors (MCP)
have become popular, many Amateurs enjoy operating
using a number of digital modes. The power and
varietyof Amateur radio increased greatly with the
development of MCP that can use your transceiver as
the communications link.
For example, it’s possible to take advantage of the
camaraderie found on RTTY, then move to Packet to
access an RBBS (Radio Bulletin Board System) to
download a recent shareware program you’ve heard
about, and then move again to AMTOR or PacTOR to
deposit mail in a regional mailbox for forwarding. After
that, you may switch to G-TOR
TM
or Clover for a
lightning fast file transfer with a friend.
RTTY (FREQUENCY SHIFT KEYING)
Radioteletype operation uses frequency shift keying
(FSK) and the 5-bit Baudot code or the 7-bit ASCII code
to transmit information.
Consult “RTTY” {page 61} under “CONNECTING
PERIPHERAL EQUIPMENT” if you need installation
information.
1 Select the FSK shift via Menu No. 29.
• FSK shift is the difference in frequencies between
mark and space.
• The 170 Hz default is used on the Amateur
bands.
2 Access Menu No. 30, and select either “ON” (space)
or “OFF” (mark) to be transmitted when keying
down.
• The default is “OFF” (mark).
3 Access Menu No. 31, and select high tone (2125 Hz)
or low tone (1275 Hz) for mark.
• The high tone (default) is commonly used
nowadays.
4 Select the operating frequency.
5 Press [CW/FSK] to select FSK.
• “FSK” appears.
6 If necessary to be compatible with the station you
want to contact, press [REV] to reverse the
transceiver to the upper sideband.
• “R” appears beside “FSK”.
•Traditionally, the lower sideband is used for FSK
operation.
• Press [REV] again if you want to return to the
lower sideband.
7 Following the instructions provided with your MCP or
RTTY equipment, enter the key sequence at your
RTTY keyboard to select the transmit mode.
• “RX” disappears and “TX” appears.
•You may instead press [SEND] to manually
select the transmit mode.
8 Begin sending data from the keyboard.
• No transmit carrier or AF input level adjustment is
necessary.
• Use Menu No. 34 to select the appropriate AF
output level. The AF control cannot be used for
this adjustment.
9 When finished transmitting, enter the key sequence
from the keyboard to return to the receive mode.
• “TX” disappears and “RX” appears.
• If you pressed [SEND] in step 7, press [SEND]
again.
RTTY FREQUENCIES
IARU Region 1
(Europe/Africa)
Frequency (kHz)
U.S.A./Canada
Frequency (kHz)
1838~1842
3580~3620
7035~7045
10140~10150
14080~14099.5
18101~18109
21080~21120
24920~24929
28050~28150
1800~1840
3605~3645
(DX: 3590)
7080~7100
(DX: 7040)
10140~10150
14070~14099.5
18100~18110
21070~21100
24920~24930
28070~28150