How to design antenna for 433.92mhz signal?
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 |
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. =================================== Plug a helical antenna into the output socket. For 40 MHz, wind 140-150 close-wound turns of enamelled 18 gauge wire on a 0.4-inch diameter plastic or cardboard former. The turns will spread over a length of about 8 inches. Whether or not it works will depend on how far away is the receiver. You can try matching the output impedance by sqeezing the box harder. How many ohms is your hand + arm + torso + legs to ground? For helicals of other dimensions download program HELICAL3 from website below. ---- .................................................. .......... Regards from Reg, G4FGQ For Free Radio Design Software go to http://www.btinternet.com/~g4fgq.regp .................................................. .......... |
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? Checkout: http://www.rfm.com/corp/appdata/antenna.pdf too! -- Scott ********************************** DIY Piezo-Gyro, PCB Drill Bot & More Soon! http://home.comcast.net/~scottxs/ ********************************** |
On Fri, 26 Dec 2003 20:08:07 +0000 (UTC), "Reg Edwards"
wrote: 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. =================================== Plug a helical antenna into the output socket. For 40 MHz, wind 140-150 close-wound turns of enamelled 18 gauge wire on a 0.4-inch diameter plastic or cardboard former. The turns will spread over a length of about 8 inches. Whether or not it works will depend on how far away is the receiver. You can try matching the output impedance by sqeezing the box harder. How many ohms is your hand + arm + torso + legs to ground? For helicals of other dimensions download program HELICAL3 from website below. Thanks X.05, Reg. What do I use for a ground plane? -- "I expect history will be kind to me, since I intend to write it." - Winston Churchill |
You can try matching the output impedance by sqeezing the box harder. How many ohms is your hand + arm + torso + legs to ground? For helicals of other dimensions download program HELICAL3 from website below. What do I use for a ground plane? =============================== YOU plus the box constitute the groundplane. Otherwise, for example, with a set of 4 1/4-wave radials you won't be handheld. --- Reg |
On Sat, 27 Dec 2003 07:09:24 +0000 (UTC), "Reg Edwards"
wrote: You can try matching the output impedance by sqeezing the box harder. How many ohms is your hand + arm + torso + legs to ground? For helicals of other dimensions download program HELICAL3 from website below. What do I use for a ground plane? =============================== YOU plus the box constitute the groundplane. Otherwise, for example, with a set of 4 1/4-wave radials you won't be handheld. Thanks Reg! You're a diamond. -- "I expect history will be kind to me, since I intend to write it." - Winston Churchill |
"Paul Burridge" wrote in message ... 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 True! (But I've got big hands.......) Hopefully it may be of use to others on the NG. |
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