Hi - I'm using some Laipac "easy link" modules in a custom remote
control/home automation device for my house. I'm using the 433.92mhz
models, datasheet he http://www.laipac.com/Downloads/Easy/TLPRLP434A.pdf
Can anyone give me any advice about how to design an antenna for this? The
reciever will be embedded in an outside wall - so the antenna can be as big
as it needs to be. The transmitter's antenna will be in a hand held device
- so the smaller the better. Can anyone give me any tips as to how to
design this antenna? And sorry for cross posting - I wasn't sure which of
these two newsgroups this question fit best. Thanks, and happy holidays!

Michael

"Michael" wrote in message
...
Hi - I'm using some Laipac "easy link" modules in a custom remote
control/home automation device for my house. I'm using the 433.92mhz
models, datasheet he
http://www.laipac.com/Downloads/Easy/TLPRLP434A.pdf
Can anyone give me any advice about how to design an antenna for this? The
reciever will be embedded in an outside wall - so the antenna can be as
big
as it needs to be. The transmitter's antenna will be in a hand held device
- so the smaller the better. Can anyone give me any tips as to how to
design this antenna? And sorry for cross posting - I wasn't sure which of
these two newsgroups this question fit best. Thanks, and happy holidays!

Michael




There is a directional yagi design @
http://picaxe.orcon.net.nz/yagi433.jpg
and a link to further data at the bottom of the page.

If you find further resources please post them here.

regards
rob

There is a directional yagi design @
http://picaxe.orcon.net.nz/yagi433.jpg
and a link to further data at the bottom of the page.

If you find further resources please post them here.

regards
rob



Other link is: http://ac6v.com/antprojects.htm

Michael wrote:

Hi - I'm using some Laipac "easy link" modules in a custom remote
control/home automation device for my house. I'm using the 433.92mhz
models, datasheet he http://www.laipac.com/Downloads/Easy/TLPRLP434A.pdf
Can anyone give me any advice about how to design an antenna for this? The
reciever will be embedded in an outside wall - so the antenna can be as big
as it needs to be. The transmitter's antenna will be in a hand held device
- so the smaller the better. Can anyone give me any tips as to how to
design this antenna? And sorry for cross posting - I wasn't sure which of
these two newsgroups this question fit best. Thanks, and happy holidays!

A simple 1/4 wave antenna should do for starters - just cut a piece of
wire to about 70/4 = 17.5 cm.

Leon
--
Leon Heller, G1HSM
Email:
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html

Leon Heller wrote in
:



Michael wrote:

Hi - I'm using some Laipac "easy link" modules in a custom remote
control/home automation device for my house. I'm using the 433.92mhz
models, datasheet he
http://www.laipac.com/Downloads/Easy/TLPRLP434A.pdf Can anyone give
me any advice about how to design an antenna for this? The reciever
will be embedded in an outside wall - so the antenna can be as big
as it needs to be. The transmitter's antenna will be in a hand held
device - so the smaller the better. Can anyone give me any tips as to
how to design this antenna? And sorry for cross posting - I wasn't
sure which of these two newsgroups this question fit best. Thanks,
and happy holidays!

A simple 1/4 wave antenna should do for starters - just cut a piece of
wire to about 70/4 = 17.5 cm.

Leon

OK - that sounds very manageable for the reciever - but what about the
transmitter? I was hoping to make it the size of the typical keyless entry
keyfob. Is that even remotely possible? Thanks,

Michael

Michael wrote:

Leon Heller wrote in
m:
Hi - I'm using some Laipac "easy link" modules in a custom remote
control/home automation device for my house. I'm using the 433.92mhz
models, datasheet he
http://www.laipac.com/Downloads/Easy/TLPRLP434A.pdf Can anyone give
me any advice about how to design an antenna for this? The reciever
will be embedded in an outside wall - so the antenna can be as big
as it needs to be. The transmitter's antenna will be in a hand held
device - so the smaller the better. Can anyone give me any tips as to
how to design this antenna? And sorry for cross posting - I wasn't
sure which of these two newsgroups this question fit best. Thanks,
and happy holidays!

A simple 1/4 wave antenna should do for starters - just cut a piece of
wire to about 70/4 = 17.5 cm.

OK - that sounds very manageable for the reciever - but what about the
transmitter? I was hoping to make it the size of the typical keyless entry
keyfob. Is that even remotely possible? Thanks,

A loop antenna is the most compact, either a loop of wire or a PCB
track. Some info on designing them he

http://www.nvlsi.no/files/Product/ap...tesallnRFn.pdf


Tim
--
The .sig is dead.

Assuming a roughly all-round, no-particular-direction antenna is required,
then the most simple antenna is called for. A simple antenna is also the
most efficient.

The most simple antenna is just a straight, vertical rod fed at its center
between its two halves. For F = 434 MHz, overall dipole length is crudely
0.33 metres = 13 inches.
----
Reg

On Fri, 26 Dec 2003 13:17:51 +0800, "Rob"
wrote:


"Michael" wrote in message
...
Hi - I'm using some Laipac "easy link" modules in a custom remote
control/home automation device for my house. I'm using the 433.92mhz
models, datasheet he
http://www.laipac.com/Downloads/Easy/TLPRLP434A.pdf
Can anyone give me any advice about how to design an antenna for this? The
reciever will be embedded in an outside wall - so the antenna can be as
big
as it needs to be. The transmitter's antenna will be in a hand held device
- so the smaller the better. Can anyone give me any tips as to how to
design this antenna? And sorry for cross posting - I wasn't sure which of
these two newsgroups this question fit best. Thanks, and happy holidays!

Michael




There is a directional yagi design @
http://picaxe.orcon.net.nz/yagi433.jpg

Very useful for a hand-held device I *don't* think!
--

"I expect history will be kind to me, since I intend to write it."
- Winston Churchill

On Fri, 26 Dec 2003 10:15:02 +0000 (UTC), "Reg Edwards"
wrote:

Assuming a roughly all-round, no-particular-direction antenna is required,
then the most simple antenna is called for. A simple antenna is also the
most efficient.

The most simple antenna is just a straight, vertical rod fed at its center
between its two halves. For F = 434 MHz, overall dipole length is crudely
0.33 metres = 13 inches.

Reg, you obviously know a thing or two about antennas. I need to come
up with a small antenna for a hand-held 40Mhz transmitter. I'd like to
use some sort of rubber duck helicoil to save space if poss. Any ideas
as to dimensions etc? The output impedance of the tx is around 140
ohms.
--

"I expect history will be kind to me, since I intend to write it."
- Winston Churchill

"Michael" wrote in message
...
Hi - I'm using some Laipac "easy link" modules in a custom remote
control/home automation device for my house. I'm using the 433.92mhz
models, datasheet he
http://www.laipac.com/Downloads/Easy/TLPRLP434A.pdf
Can anyone give me any advice about how to design an antenna for this? The
reciever will be embedded in an outside wall - so the antenna can be as
big
as it needs to be. The transmitter's antenna will be in a hand held device
- so the smaller the better. Can anyone give me any tips as to how to
design this antenna? And sorry for cross posting - I wasn't sure which of
these two newsgroups this question fit best. Thanks, and happy holidays!


Theese three app. notes were helpfull for me:

www.microdesign.dk/1.pdf
www.microdesign.dk/2.pdf
www.microdesign.dk/3.pdf

Cheers

Klaus