Kenwood TS-870S Split-Frequency Operation, Communicating, Modulation Type, Frequency kHz

6 COMMUNICATING

Shown below are the data rates and types of modulation used for HF Packet operation:

Mode	Data Rate	Modulation Type
USB & LSB	300 bps	F1
	(AFSK)
USB & LSB	1200 bps	F1
	(PSK)
FM	1200 bps	F2
	(AFSK)

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	U.S.A./Canada
(Europe/Africa)
	Frequency (kHz)
Frequency (kHz)
Ñ	1800~1830
3590~3600	3620~3635
Digital band	7080~7100
Digital band	10140~10150
14089~14099, 14101~14112	14095~14099.5
Digital band	18105~18110
21100~21120	21090~21100
Digital band	Ñ
28120~28150, 29200~29300	28120~28189

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.

This completes the ÒDIGITAL OPERATIONÓ section. Refer to ÒOPERATING AIDSÓ beginning on page 44 for information about additional useful functions for operating.

SPLIT-FREQUENCY OPERATION

Split-frequency operation uses one VFO for the receive frequency and the other VFO for the transmit frequency. While operating ÒsplitÓ, the VFOs switch automatically when you switch from receive to transmit and vice versa. This allows you to move either VFO frequency independently without affecting the other.

When a rare or desirable station is heard, he or she may immediately get many responses, all at the same time. It quickly becomes difficult to separate and identify both the original calling station (usually a DX station), and the many responding stations. This ÒDX pileupÓ is exciting, but it is also very inefficient and frustrating. Often the DX station is lost under the noise and confusion of many calling stations.

If things grow out of hand, it is the DX stationÕs responsibility to take control by announcing that he will be Òlistening up 5 (kHz, from his present transmit frequency)Ó, or Òlistening down between 5 and 10 (kHz)Ó. This usually means the DX station will not change his transmit frequency, but will begin split operation in order to tune among the calling stations, pick out a call sign or two, and begin working those stations. Since, for the moment, the DX station is holding his transmit frequency, you should not change your receive frequency.

If you find that you are suddenly being called as that rare or desirable station, your ability to control the situation and complete contacts is much improved by Ògoing to splitÓ. The following procedure explains how to operate split frequency on the TS-870S.

1Press [RX A] or [RX B] or [RX M.CH].

¥Your receive frequency will be the current frequency selected by VFO A, by VFO B, or by the current memory channel respectively.

¥If you press [RX M.CH], then that memory channel must contain a split channel unless you select a VFO for the transmit frequency in the next step. See ÒMEMORY CHANNEL STORAGE, Split-frequency ChannelsÓ {page 55}.

2Press [TX A] or [TX B] or [TX M.CH].

¥Your transmit frequency will be the current frequency selected by VFO A, by VFO B, or by the current memory channel respectively.

AGC AUTO	SPLIT
	RIT

USB

¥If you pressed either [RX A] or [RX B] in Step 1, then you must select the other VFO in this step, or press [TX M.CH].

¥When you recall a split memory channel to select a transmit frequency, the transmit frequency stored in that channel will be used.

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