Kenwood TS-570D User Manual - Page 33

AMTOR/ PACKET/ PACTOR/ G-TORTM/ CLOVER Due to their error-handling capability and speed of transmission, these modes are more efficient than earlier forms of digital communication by machine. In the case of G-TORTM, it was developed specifically to handle the adverse conditions of communicating across the solar system with spacecraft during their missions. Mode Meaning AMTOR AMateur Teleprinting Over Radio Packet Packetized data used per AX.25 protocol PacTOR Packet Teleprinting Over Radio G-TORTM Golay-coded Teleprinting Over Radio Clover Characteristic shape of an accurately tuned signal as viewed on a monitor. On most HF bands, audio frequency shift keying (AFSK) is used. This method of modulation uses audio tones therefore either the LSB or USB mode should be selected. Traditionally, LSB is used similar to RTTY with the exception of AMTOR which is normally operated using USB. In some countries, the licensing authorities permit F2 operation on some frequencies in the 10 meter band. For this type of operation, select the FM mode. Consult "MCP AND TNC" {page 62} under "CONNECTING PERIPHERAL EQUIPMENT" if you need installation information. Note: ◆ For digital operation using the SSB or FM mode, switch the Speech Processor OFF. When using the SSB mode, also select a fast AGC setting. ◆ When selecting one of the filters (not OFF) in Menu No. 32, do not activate the RX Equalizer via Menu No. 50; the default for Menu No. 50 is OFF. ◆ Set Menu No. 32 to OFF for voice operation since the filters available are too narrow for voice. 1 Select the appropriate filter bandwidth via Menu No. 32. • The default is OFF. 2 Select the operating frequency. 3 Press [LSB/USB] to select LSB or USB. • For F2 operation, select FM by pressing [FM/AM]. • If you selected one of the filters in step 1 (not OFF), "FSK" appears with "LSB", "USB", or "FM". 4 Following the instructions provided with your TNC or MCP, enter the calibrate mode so you can generate a mark condition. • "RX" disappears and "TX" appears. 5 Use Menu No. 33 to select the appropriate AF input level. • Select a low input level so long as the ALC meter reflects. 7 SPECIALIZED COMMUNICATING 6 Exit the calibrate mode. • "TX" disappears and "RX" appears. 7 Use Menu No. 34 to select the appropriate AF output level. • The AF control cannot be used for this adjustment. 8 Send commands and data. • The transceiver will briefly transmit each time it sends your commands and data, or when it acknowledges transmissions from other stations. The data rates and types of modulation used for HF Packet operation are shown below. Mode Data Rate Modulation Type USB & LSB 300 bps (AFSK) F1 USB & LSB 1200 bps (PSK) F1 FM 1200 bps (AFSK) F2 Note: In some countries, F2 modulation at 1200 bps may be used on the 10-meter band. Consult your national Amateur radio organization to obtain band plans that specify where in each band various modes are used. PACKET FREQUENCIES IARU Region 1 (Europe/Africa) Frequency (kHz) - 3590~3600 Digital band Digital band 14089~14099, 14101~14112 Digital band 21100~21120 U.S.A./Canada Frequency (kHz) 1800~1830 3620~3635 7080~7100 10140~10150 14095~14099.5 18105~18110 21090~21100 Digital band - 28120~28150, 29200~29300 28120~28189 - 50600~50780 AMTOR activity can be found on or near 14075 and 3637.5 kHz. These would also be good starting places when searching for PacTOR, G-TORTM, or Clover stations. 27