Kenwood TS-870S ERROR-CHECKING Modes AMTOR/ PACKET/ PACTOR/ G-TOR/ Clover, Rtty Frequencies

6 COMMUNICATING

4Following the instructions provided with your MCP or RTTY equipment, enter the key sequence at your RTTY keyboard to select the transmit mode.

¥The ÒON AIRÓ indicator lights.

¥You may instead press [SEND] to manually select transmit.

5Adjust the CAR control so that the meter reads in the ALC zone but doesnÕt exceed the upper ALC zone limit.

6Begin sending data from the keyboard.

7When finished transmitting, enter the key sequence from the RTTY keyboard to return to receive mode.

¥The ÒON AIRÓ 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	U.S.A./Canada
(Europe/Africa)
	Frequency (kHz)
Frequency (kHz)
1838~1842	1800~1840
3580~3620	3605~3645
	(DX: 3590)
7035~7045	7080~7100
	(DX: 7040)
10140~10150	10140~10150
14080~14099.5	14070~14099.5
18101~18109	18100~18110
21080~21120	21070~21100
24920~24929	24920~24930
28050~28150	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.

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.

1Select the operating frequency.

2Press [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.

3Select the ALC meter function by pressing [METER].

4Following the instructions provided with your TNC or MCP, enter the calibrate mode so you can generate a mark condition.

¥The ÒON AIRÓ indicator lights.

5Select the correct setting for Menu No. 20 (PKT.IN) so that the meter reads in the ALC zone but doesnÕt exceed the upper ALC zone limit.

6Exit the calibrate mode.

¥The ÒON AIRÓ indicator goes out.

7Send 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