Ramsey Electronics FZ-146 Manual de Instruções descarregar pdf (Página 4)

P-IBM • 4

INTRODUCTION TO THE P-IBM PACKET RADIO:

Think for a moment about all those "unusual" computers you saw at the last

hamfest, the gray, blue, black, green or silver ones confidently marked

"Great for Packet" and marked down and down and down to "make offer".

Are those computers and "dumb terminals" REALLY "great for packet"? Sure

they are, as long as they have a working serial port and you have another

piece of equipment called a Terminal Node Controller or "TNC".

After all, the only functions wanted by today's TNC from your computer are

the keyboard and the screen, plus an ability to store files, if that's what you

want. That's because the TNC itself is a microprocessor controlled device,

which means that it IS a computer.

Properly speaking, today's TNC's or "packet data controllers" are a

combination of TWO devices needed for packet operation: the actual TNC

circuit plus a MODEM (MOdulator-DEModulator), a circuit which interfaces

the TNC with the radio. In the early days of packet radio (just a few years

ago!), the TNC and "radio modem" often were two separate pieces of

equipment.

So, if you have a TNC and a PC-compatible computer hooked to your

Ramsey FX VHF transceiver or other radio for packet data operation, you are

actually using TWO computers to do the job of one. Your PC can perform all

the functions of a TNC, by means of user-supported shareware.

Therefore, if you have a PC capable of running packet radio software such

as Baycom or PMP (Poor Man's Packet), all you need is a radio modem

capable of handling today's high data speeds. And that's exactly what the

Ramsey P-IBM Packet Modem is designed to do! Your computer and packet

software team up to serve as a very sophisticated, feature-packed TNC, and

the P-IBM Modem is the high-speed vital hardware connection between your

computer and your transceiver.

In fact, your Packet Modem is a solid and economical investment for your

ham radio station that is very unlikely to become obsolete. Data transmission

modes and protocols are still evolving and improving. These can always be

simulated through software in addition to new or upgraded "magic boxes"

offered by the leading manufacturers of data controllers. Yet, the need for a

reliable radio modem or interface between the computer and transceiver

remains the same.

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Ramsey Electronics FZ-146 Manual de Instruções Página 4