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1989-12-31
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3KB
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51 lines
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ +
+ MODEMS WITH NO PHONE LINE! +
+ +
+ BY MARTIN JONES +
+ +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Yes I know it sounds pretty unbelievable doesn't it, but it's true.Each day
RADIO AMATEURS the world over exchange all sorts of information between all
sorts of computers without incurring a phone bill of any description. How?
you may ask, or you may not. Well to start with, to call it a modem isn't
strictly true. What it is is a TERMINAL NODE CONTOLLER (TNC) which
controls a tranceiver ( a transmitting and receiving radio ). The TNC also
organises all the protocols associated with these transmissions.Then a home
computer can be used to display all of the incoming and outgoing
information or messages. This system is known as PACKET radio. "PACKET",
as the name implies, means a transmission is split up into several packets
of data which are sent one at a time. This means a complete message may
need several packets. After each packet is sent the receiving computer
sends an acknowledgement. Then the transmitting computer sends the next
packet and so on. Through using this form of hand shaking means that
information passed between these computers is virtually error free.
The only down side to using the radio transmitters for packet radio is that
you need a licence, and to get a licence you have to take an exam. But as
I said before there are radio amateurs the world over so if they can pass
an, exam why can't you?!
I hope you're not too bored by all this but just incase, I'll stop typing!
If anybody would like more information on amateur radio or packet, please
feel free to contact me. Alternatively contact the R.S.G.B. (RADIO SOCIETY
of GREAT BRITAIN).
Here are the addresses:
R.S.G.B
LAMBDA HOUSE my adrress:- MARTIN JONES
CRANBORNE ROAD 6 CORONATION ROAD
POTTERS BAR WORLE
HERTFORDSHIRE WESTON-S-MARE
EN6 3JW AVON
BS22 9DT