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'Radio Transmissions'
1998\06\25@054208 by Nuno Pedrosa

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Thank you for the links!
I've looked in Lynx, and they have small TX/RX pcb mounted that look
really promising (and quite cheap, too. Enough to consider buying
instead of building).

Now I need to find the best way to work with them. They connect straight
to the CPU, no problem with that, I think. But I need these to be
really small. I hoped to be able to use vitually no antena, since I
only need about 10-30 meters. But I never worked with RF. Don't know
if this is possible.

I intend to have a small transmiter just sending a code. And then, I
want a receiver, getting this code. Since I'll be using a PIC in this
receiver, I can do more than just checking the code. But that's
basically what I need.
In the transmitter it's probably easier to use also a PIC, instead of
playing around with other logic...

Any hints you could give me, I appreciate.

 Thank you,
 Nuno.
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1998\06\25@204438 by keller

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To you probably could transmit through just a 50ohm resistor (I think wire
wound would work best).  The resistor will dissipate most of the power but
still radiate some energy.  If you are making a PCB you could use a trace as
an antenna.  Check out http://www.parallaxinc.com  they have a Tx/Rx pair that uses
a copper trace on the board for an antenna.

If all you are doing is transmitting the same code out I would use one of
the 8-pin PIC's.

Steve Keller


> {Original Message removed}


'Radio Transmissions'
1998\07\01@212241 by Craig Webb
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At 11:30 AM 6/25/98 +0200, you wrote:
>Thank you for the links!
>I've looked in Lynx, and they have small TX/RX pcb mounted that look
>really promising (and quite cheap, too. Enough to consider buying
>instead of building).
>
>Now I need to find the best way to work with them. They connect straight
>to the CPU, no problem with that, I think. But I need these to be
>really small. I hoped to be able to use vitually no antena, since I
>only need about 10-30 meters. But I never worked with RF. Don't know
>if this is possible.

Lynx just got in cylindrical PCB mount antennas for their 900MHz units and
has them for their others already. These antennas are pretty small and
should do the trick.

Craig Webb

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