User manual KENWOOD TH-22A

[. . . ] · Has a built-in TNC which conforms to the AX. 25 protocol. With a portable computer, allows you to enjoy Packet operation quite easily. · Includes a program for dealing with data formats supported by Automatic Packet/ Position Reporting System (APRS®) . · Is capable of receiving packet data on one band while receiving audio on another band. [. . . ] Packets can be transmitted on radio waves as well as on communications lines. Besides a transceiver and a computer, all you need is a terminal node controller (TNC). A TNC converts packets to audio tones and vice versa as one of its tasks. A variety of packet applications developed by hams include packet bulletin board systems (PBBSs). PBBSs are created and maintained by volunteers called a System Operator (SysOp). You may access one of your local PBBSs to send e-mail, download a file, or obtain various useful information. Thousands of PBBSs, which have formed a worldwide network, relay e-mail to its intended destination around the world. First find out the call signs and frequencies used by your local PBBSs. Reference material for starting packet operation should be available at any store that handles Amateur Radio equipment. Note: x Not all functions available via conventional TNCs are supported by the TNC built in this transceiver. x Packet operation, easily affected by transmit and receive conditions, requires a full-scale S-meter reading for reliable communication. When the S-meter reads less than maximum during 9600 bps operation, communication errors are frequent. The shaded steps indicate operations on your personal computer. First connect the transceiver to the personal computer {page 53}. Note: You may switch Battery Saver OFF {page 49} to prevent the initial portion of a received packet from being missed. y To select 9600 bps as the transfer rate from/to the target station, type HBAUD (or HB) 9600 and press [Enter] or [Return]. The default is 1200 bps. · You must select the same transfer rate as the target station. q Install an appropriate communications program on the personal computer. · A variety of freeware or shareware programs can be obtained in various ways. Consult your reference material or other "packeteers". u Type MYCALL (or MY) then your call sign (9 digits max. ) and press [Enter] or [Return] to set your call sign on the TNC. · You cannot use the default setting (NOCALL). i Tune to an appropriate frequency. · First you may want to monitor packets which are transmitted among other stations. When packets are received, text appears and the computer screen scrolls. w Initiate the communications program and set the following parameters on the personal computer: · · · · · Transfer rate (TNC <­> Computer): 9600 bps Data length: 8 bit Stop bit: 1 bit Parity: Non Flow control: Xon/Xoff o To connect with the target station, type CONNECT (or C) then its call sign and press [Enter] or [Return]. · When a linkage is established, a message which informs you of it appears on the computer screen; " appears. on the transceiver display, " · If packets from other stations keep your squelch open, adjust the squelch level in advance. The TNC cannot transmit in such a situation. e Access Menu 1­4­1 to select band A or B as the data band {page 55}. r Press [TNC] to switch ON the TNC. ·" " appears. t Press [TNC] again to enter Packet mode. · "PACKET" also appears. !0 Send appropriate commands and, if necessary, messages to the target station via the TNC. 54 SELECTING DATA BAND This transceiver is capable of receiving packet data on one band (data band) while receiving audio on another band. Select band A or B as the data band for receiving or transmitting packets. " " indicates the current data band; the default is band A. Access Menu 1­4­1 (DATA BAND) and select band A or B. FULL DUPLEX This transceiver is also capable of simultaneously transmitting and receiving signals. [. . . ] 21 Packet Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Power-ON Message . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Programmable VFO . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Repeater Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]