Kenwood TS-870S User Manual - Page 48

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 (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) - U.S.A./Canada Frequency (kHz) 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 - 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 "DIGITAL OPERATION" section. Refer to "OPERATING AIDS" 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 "split", 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 "DX pileup" 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 station's responsibility to take control by announcing that he will be "listening up 5 (kHz, from his present transmit frequency)", or "listening down between 5 and 10 (kHz)". 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 "going to split". The following procedure explains how to operate split frequency on the TS-870S. 1 Press [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 "MEMORY CHANNEL STORAGE, Split-frequency Channels" {page 55}. 2 Press [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 USB SPLIT RIT • 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. 42