How to build a radio card
Introduction
I components list
II usefull tools
III manufacture stages
IV if the card doesn't
works ...
V softwares
VI usefull links
Conclusion
There is a documentation where you
will find the components list and all the
explanations you need to build a radio card for
your hp49g or hp48g/g+/gx.
The carried of the card is 35 meters (tests where
realised); you can connect the card on your
calculator whith the hp-pc cable .
You must have all this components to build your radio card:
A Velleman TX 433 transmitter |
|
An Auriel-RF290 A-5S Aurel receiver |
|
2 diods 1N4148 |
|
One 470 Ohm resistor |
|
1 wire for 9V battery |
|
1 DB9 male pin |
|
some wire |
|
2 metallic antennas of 15 cm |
|
The circuit here is the typon of the circuit |
|
You will need some tools:
- an iron to solder
- some tin
- a peg to bare
- a blade peg
- a small drill (if there is no hole in the
circuit)
If you have all the equipment, you can build
your card !
If the holes are not drilled, you must drill them
now.
You must bare alimentation wires, cut 3 small
wires (2 cm) and bare them
1) solder the alimentation: |
|
2) solder 3 small wires on
the db9 drive, on the broach 1, 3 and 4 ____________________ \ *1 *2 *3 *4 *5 / \ *6 *7 *8 *9 / |
|
3) solder the db9 pin on the circuit; Warning ! Wires of broach 3 et 4 must be crossed ! (see the picture) |
|
4) solder the two diods IN THE RIGHT SENSE !!! (the black feature toward the outside of the circuit) |
|
5) solder the resistor |
|
6) solder the transmitter |
|
7) solder the reciever |
|
8) solder antennas |
|
Your radio module is complete
He must look like this:
IV if
the card doesn't works
...
It's not astonishing ... the construction of a radio module isn't easy...
You can check some things:
1) did you buy teh good components ?
2) are they on the good place on the card ?
3) are diods in the right sense ?
4) soldering plots doesen't touch themselves
5) have you a good battery, is the module well
connected to the calculator whith the hp-pc cable
?
6) is the software you use good ?
If you don't find the problem, you can buy a radio module (it cost only 50 $). If you are interessed, you can contact Yoann Désir (yoanndesir@yahoo.com).
There are two softwares: ChatHP
and icqHP by Yoann Désir
Whith ChatHP, you can
chat with an other hp-user;
With IcqHP you can
exchange files and messages using the radio module
If you want more information about IcqHP,
you can visit the official web site www.multimania.com/icqhp
Here are some sites where you can find some
informations about radio modules:
www.lebebert.fr.st
: origine site of this documentation .
www.multimania.com/hp49g
: Yoann Désir's site, where you can download last
versions of Chat HP and Icq HP .
www.multimania.com/icqhp
: a site where you will find the last version of
Icq HP and a detailled documentation about it.
I hope you have anderstand all the explanations and you will succeed to make your own card; it's intersting to make it, and this type of communication is impressionnat for a calculator ...
Bebert