Bedienungsanleitung Kenwood TS-2000E (Seite 57 von 150) (Englisch)

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SPECIALIZED COMMUNICATIONS

PACKET RADIO

Packet is a unit of data transmitted as a whole from

one computer to another, on a network. 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) or Multimode Communications Processor

(MCP). One of the tasks of TNCs and MCPs is to

convert data packets to audio tones, and vice versa.

This transceiver has a built-in TNC which allows you

to use basic (not full) packet applications.

A variety of packet applications developed by hams

include packet bulletin board systems (PBBSs).

PBBSs are created and maintained by volunteers

called System Operators (SysOp). You may access

one of your local PBBSs to send e-mail, download

files, or obtain various useful information. Thousands

of PBBSs, which have formed a worldwide network,

relay e-mail to their intended destinations around the

world.

When you access a local PBBS for the first time, you

often need to register as a new user. After you are

successfully registered, it will then be available as

your home PBBS. E-mail addressed to you will be

held under a directory, called a mailbox, on your

home PBBS.

To send e-mail, you must designate the address of a

recipient, using his or her call sign and the call sign of

his or her home PBBS; ex. KD6NUH@KJ6HC. In this

example, the e-mail is addressed to KD6NUH whose

home PBBS is KJ6HC. If your home PBBS cannot

find KJ6HC in its address file to forward your mail,

you must designate the address in more detail. You

may enter “KD6NUH@KJ6HC.#ABC.CA”, or

“KD6NUH@KJ6HC.#ABC.CA.USA”, or up to

“KD6NUH@KJ6HC.#ABC.CA.USA.NA”, as

necessary. The complete address of a recipient living

in the U.S.A., for example, should include an

appropriate region code (preceded by a #), state,

country, and continent abbreviations, as above.

For further information, consult reference books

which should be available at any store that handles

Amateur Radio equipment. Web pages relating to

Packet will also be helpful. On Internet search

engines, use “Packet Radio” as key words to find

those Web pages.

PBBS

Note:

◆

Unlike a TNC, a Multimode Communications Processor (MCP)

serves as a communications interface in several digital modes

such as Packet, RTTY, and AMTOR. You can cause it to switch

among the modes by sending a single command from your

computer.

◆

If there is an amateur radio club in your area, consider becoming

a member. You can often learn more in an hour from

experienced hobbyists, than in a month of independent research.

Ask on the local repeaters, or contact your national amateur radio

organization (the ARRL in the U.S.A.) for information on local

amateur radio clubs. You’ll be glad you did.

BUILT-IN TNC

This transceiver has a built-in TNC which conforms to

the AX.25 protocol. Since the built-in TNC has been

designed to work with the Packet Cluster Tune

{page 53} and Sky Commander II+ {page 83}

functions, some of the enhanced TNC commands

may not be available. For the commands supported

by the built-in TNC, consult “BUILT-IN TNC

COMMAND LIST” starting on page 110. The AX-25

protocol is used for communication between TNCs.

The TNC accepts data from your personal computer

and assembles it into packets. It then converts those

packets to audio tones which the transceiver can

transmit. The TNC also takes audio tones from the

transceiver, converts them to data for the computer,

and checks for errors in the data.

In order to activate the built-in TNC, access Menu

No. 55 and select ON. The default is OFF. “PKT”

will appear to show that the built-in TNC is ON.

The TNC mainly functions in Command or Converse

mode. First, you should learn the difference between

these two modes.

• Command mode

When you select Packet mode, the TNC enters

Command mode. A “cmd:” prompt appears on the

computer screen. You can type commands from

the computer keyboard to change the settings of

the TNC. When in Converse mode, press

[Ctrl]+[C] on the keyboard to return to Command

mode.

• Converse mode

The TNC enters this mode when a link with the

target station is established. On the computer

keyboard, type an appropriate command and a

message if necessary, then press [Enter] or

[Return]. What you type is converted into packets

and transmitted over the air. When in Command

mode, type CONVERSE, CONV, or K to enter

Converse mode.

Note: The built-in TNC automatically reinitiates when a malfunction

is detected; this does not designate that the transceiver is defective.

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Kenwood TS-2000E Seite 57

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