Specifications

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.
The Radio Port two modems are:
MODEM 1 AFSK Modem, 200 Hz shift, Mark=1270 Hz, Space=1070 Hz
MODEM 2 AFSK Modem, 200 Hz shift, Mark=2225 Hz, Space=2025 Hz
MODEM 3 AFSK Modem, 1000 Hz shift, Mark=1200 Hz, Space=2200 Hz
MODEM 4 AFSK Modem, 1000 Hz shift, Mark=1200 Hz, Space=2200 Hz eq
MODEM 5 AFSK Modem, 200 Hz shift, Mark=980 Hz, Space=1180 Hz
MODEM 6 AFSK Modem, 200 Hz shift, Mark=1650 Hz, Space=1850 Hz
MODEM 7 AFSK Modem, 800 Hz shift, Mark=1300 Hz, Space=2100 Hz
MODEM 8 AFSK Modem, 800 Hz shift, Mark=1300 Hz, Space=2100 Hz eq
MODEM 9 AFSK Modem, Direct FSK 9600 baud internal option.
MODEM 10 External option, user installed.
7.7.1 Selecting Modems
The various modems available in the PK-900 can be seen with the
DIRECT(ory) command. To display all the available modems simply
enter the Command Mode of the PK-900 and then type DIR as shown.
DIR <Enter>
The PK-900 will respond with the following:
- Port 1 - - Port 2 -
1: FSK 45 bps 170: 2125/2295 1: Internal 200: 1070/1270
2: FSK 100 bps 170: 2125/2295 2: Internal 200: 2025/2225
3: FSK 45 bps 200: 2110/2310 3: Internal 1000: 1200/2200
4: FSK 100 bps 200: 2110/2310 4: Internal 1000: 1200/2200 eq.
5: FSK 100 bps 425: 2125/2550 5: Internal 200: 1180/980
6: FSK 100 bps 850: 2125/2975 6: Internal 200: 1850/1650
7: FSK 100 bps 850: 1275/2125 7: Internal 800: 2100/1300
8: Analog 900/2500 8: Internal 800: 2100/1300 eq.
9: FSK 2400 bps 800: 1300/2100 9: Internal option
10: FSK 300 bps 200: 2110/2310 10: Modem disconnect header
11: FSK 1200 bps 1000: 1200/2200
12: Morse 750
cmd:
Any modem from the list may be loaded with the MODEM command, but
only the 100 baud modems listed will operate in AMTOR. For example,
to operate AMTOR on radio port 1 and 1200 bps VHF packet on radio
port 2 you must select modems for radio ports 1 and 2. First, enter
the Command Mode of the PK-900 and then type MODEM 2/4 as shown below:
MODEM 2/4 <Enter>
The PK-900 will respond with the following:
MODem was x/x (The previous modems)
MODem now 2/4
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