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View Full Version : Try building a RF antenna for a cheap RF pair...



Tricky Nekro
08-11-2006, 03:22 AM
Hello to everyone,

Unfortunately I had to buy a cheap RF pair cause of lack of pocket money and now I face promblems with the communications...
I need to built a antenna for stabilizing the communication and amplify the signal so to have an about 500m Radius of control...
When I test the module I had problems with text and long numbers...
The modules are rr2 - 413.92 and rt4 - 413.92...
I powered the circuit from a cheap wall transformer and both BS2 had same ground... Is this a negative factor...
What can I do???


Thanks for your time,
Provas, Greece


PS. Sorry for my Englishhttp://forums.parallax.com/images/smilies/blush.gif


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-Rule your Destiny-
--Be Good. Be Bad. Be Provas--

bobledoux
08-12-2006, 04:44 AM
If you need control in a fixed direction consider building a Yagi antenna. For omni directional use you might consider a vertical antenna with a good ground plane. You might need a vertical longer than a quarter wave length to achieve some gain to your power output.

Look at amateur radio manuals for more information.

Tricky Nekro
08-12-2006, 10:29 AM
Thanks for the reply...

Unfortunately I didn't find much... most datasheets would need to payed to be delivered... And Yagi antennas are way too big for me too use in one 1 x 0.5cm transmitter... Any ideas on how I can ground my antenna, please... Is a amplifier needed? And how sizes are culculated...

Thanks in advance...

Provas, Greece

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-Rule your Destiny-
--Be Good. Be Bad. Be Provas--

Franklin
08-12-2006, 02:08 PM
Lots of stuff here www.rfcafe.com/references/design_data/antenna_design_data.htm (http://www.rfcafe.com/references/design_data/antenna_design_data.htm)

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- Stephen