Specifications

ABaud was 110
ABaud now 150
The ABAUD command sets the ASCII RTTY speed. The most common speed
is 110 bauds on HF, but other speeds including commercial speeds are
supported. See the Command Summary for all the supported speeds.
6.6.4 Operating at Commercial or VHF Wide ASCII RTTY Shifts
Most commercial stations found in the non amateur Short Wave bands
operate with a wide Frequency Shift keying of either 425 or 850 Hz
shift. To allow these stations to be received other modems are
available in the PK-900 and can be selected with the MODEM command.
The following modems are available for Baudot and ASCII operation
on Radio Port 1:
MODEM 1 AFSK Modem, 170 Hz shift, M 2125 Hz, S 2295 Hz, 45 bps
MODEM 2 AFSK Modem, 170 Hz shift, M 2125 Hz, S 2295 Hz, 100 bps
MODEM 3 AFSK Modem, 200 Hz shift, M 2125 Hz, S 2550 Hz, 45 bps
MODEM 4 AFSK Modem, 200 Hz shift, M 2125 Hz, S 2975 Hz, 100 bps
MODEM 5 AFSK Modem, 425 Hz shift, M 2125 Hz, S 2550 Hz, 100 bps
MODEM 6 AFSK Modem, 850 Hz shift, M 2125 Hz, S 2975 Hz, 100 bps
MODEM 7 AFSK Modem, 850 Hz shift, M 2125 Hz, S 1275 Hz, 100 bps
MODEM 10 AFSK Modem, 200 Hz shift, M 2110 Hz, S 2310 Hz, 300 bps
If your license permits, you can also transmit to these stations when
the appropriate MODEM number and data rate is selected.
6.6.5 Other RTTY Commands for ASCII Operation
Many of the commands mentioned above in the Baudot Section also
operate in the ASCII RTTY mode as well. They are listed below:
AAB ACRDISP ALFDISP DIDDLE EAS RFRAME
RXREV TXREV WORDOUT WRU
6.7 Simultaneous RTTY and Packet Operation
Your PK-900 can operate on Baudot or ASCII RTTY on Radio Port 1 and
HF or VHF Packet on Radio Port 2 at the same time. With this feature
you won't miss any local Packet activity while operating RTTY.
Before the second radio port can be used for packet operation, a
modem must be selected for the second port. Use the MODem
command to select either or both modems, for example, MOD 1/4. For
Radio Port 2, the command would be MOD /4 to select modem 4.
1/93 6-10