Kenwood TS-870S User Manual - Page 47

4 Following the instructions provided with your MCP or RTTY equipment, enter the key sequence at your RTTY keyboard to select the transmit mode. • The "ON AIR" indicator lights. • You may instead press [SEND] to manually select transmit. 5 Adjust the CAR control so that the meter reads in the ALC zone but doesn't exceed the upper ALC zone limit. 6 Begin sending data from the keyboard. 7 When finished transmitting, enter the key sequence from the RTTY keyboard to return to receive mode. • The "ON AIR" indicator goes out. • If you are manually switching between transmit and receive, press [SEND] to return to receive. • Use Menu No. 21 (PKT.OUT) to select the appropriate AF output level. The AF gain control cannot be used for this adjustment. Traditionally, the lower sideband is used for FSK operation. Pressing [FSK/-R] reverses the transceiver to the upper sideband. RTTY FREQUENCIES IARU Region 1 (Europe/Africa) Frequency (kHz) 1838~1842 3580~3620 7035~7045 10140~10150 14080~14099.5 18101~18109 21080~21120 24920~24929 28050~28150 U.S.A./Canada Frequency (kHz) 1800~1840 3605~3645 (DX: 3590) 7080~7100 (DX: 7040) 10140~10150 14070~14099.5 18100~18110 21070~21100 24920~24930 28070~28150 ERROR-CHECKING MODES (AMTOR/ PACKET/ PACTOR/ G-TOR/ 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. 6 COMMUNICATING 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. Note: When using the SSB mode for digital operation, use a fast AGC setting and switch OFF your Speech Processor. Also, take advantage of the different filter bandwidths available via Menu No. 19 (PKT.FIL). Remember to set Menu No. 19 to OFF for voice operation since the filters available are too narrow for voice. 1 Select the operating frequency. 2 Press [LSB/USB] to select upper or lower sideband mode. • For F2 operation, select the FM mode by pressing [FM/AM]. Switching Menu No. 59 (FM.BOOST) to ON may lower error rates for FM operation. The Menu No. 19 (PKT.FIL) filters for digital operation cannot be used when the FM mode is selected. 3 Select the ALC meter function by pressing [METER]. 4 Following the instructions provided with your TNC or MCP, enter the calibrate mode so you can generate a mark condition. • The "ON AIR" indicator lights. 5 Select the correct setting for Menu No. 20 (PKT.IN) so that the meter reads in the ALC zone but doesn't exceed the upper ALC zone limit. 6 Exit the calibrate mode. • The "ON AIR" indicator goes out. 7 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. • Use Menu No. 21 (PKT.OUT) to select the appropriate AF output level. The AF gain control cannot be used for this adjustment. 41