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#1
July 20th 12, 12:20 AM
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315mhz/433mhz transmitter
hi
i'm just new to this field and i need some help on it and i appreciate any help... my aim is to make a 315 or 433 transmitter and receiver so what ics is the best for that and where can i buy them and so for the antennas(but i would like to build them)... thanks |
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#2
July 20th 12, 08:21 AM
posted to rec.radio.amateur.antenna
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315mhz/433mhz transmitter
On Thu, 19 Jul 2012 23:20:02 +0000, foxbrain
wrote: hi i'm just new to this field and i need some help on it and i appreciate any help... my aim is to make a 315 or 433 transmitter and receiver so what ics is the best for that and where can i buy them and so for the antennas(but i would like to build them)... thanks For the antenna use a piece of wire, a length of lamda/4 is fine. w. |
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#3
July 20th 12, 03:44 PM
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Quote:
what about it's ICs |
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#4
July 20th 12, 06:28 PM
posted to rec.radio.amateur.antenna
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315mhz/433mhz transmitter
foxbrain wrote:
'Helmut Wabnig[_2_ Wrote: ;793671']On Thu, 19 Jul 2012 23:20:02 +0000, foxbrain wrote: - hi i'm just new to this field and i need some help on it and i appreciate any help... my aim is to make a 315 or 433 transmitter and receiver so what ics is the best for that and where can i buy them and so for the antennas(but i would like to build them)... thanks- For the antenna use a piece of wire, a length of lamda/4 is fine. w. is it a straight wire or curved ? shouldn't i look at it's impedance and make matching with it ? what about it's ICs If you want meaningfull replies, you need to ask meaningfull questions. What do you intend to transmit, modulation type, power levels, etc.? |
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#5
July 21st 12, 03:02 PM
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i want to make a remote control for 3 relays using the encoders/decoders: pt2262 and pt2272 , it doesn't mine what kind of modulation...
i recently found these 2 ics : u2741b and ata3741 . but what kind of antenna do i need? is there any other thinks i have to know? |
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#6
July 21st 12, 07:06 PM
posted to rec.radio.amateur.antenna
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315mhz/433mhz transmitter
On Sat, 21 Jul 2012 14:02:29 +0000, foxbrain
wrote: i want to make a remote control for 3 relays using the encoders/decoders: pt2262 and pt2272 , it doesn't mine what kind of modulation... i recently found these 2 ics : u2741b and ata3741 . but what kind of antenna do i need? is there any other thinks i have to know? Yes, thinkalot. Why not buy such a thing as this he http://tinyurl.com/c2pku44 w. |
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#7
July 21st 12, 07:41 PM
posted to rec.radio.amateur.antenna
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315mhz/433mhz transmitter
foxbrain wrote:
i want to make a remote control for 3 relays using the encoders/decoders: pt2262 and pt2272 , it doesn't mine what kind of modulation... i recently found these 2 ics : u2741b and ata3741 . but what kind of antenna do i need? How would anyone here know that as it depends on what kind of range you exepect to get. The simplest antenna would be a quarter wavelength piece of wire. is there any other thinks i have to know? Probably. |
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#8
July 21st 12, 04:35 PM
posted to rec.radio.amateur.antenna
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315mhz/433mhz transmitter
On 7/20/2012 9:44 AM, foxbrain wrote:
'Helmut Wabnig[_2_ Wrote: ;793671']On Thu, 19 Jul 2012 23:20:02 +0000, foxbrain wrote: - hi i'm just new to this field and i need some help on it and i appreciate any help... my aim is to make a 315 or 433 transmitter and receiver so what ics is the best for that and where can i buy them and so for the antennas(but i would like to build them)... thanks- For the antenna use a piece of wire, a length of lamda/4 is fine. w. is it a straight wire or curved ? shouldn't i look at it's impedance and make matching with it ? what about it's ICs Use lots of ICs. It doesn't matter which ones. Just put a lot in. |
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#9
July 21st 12, 07:33 PM
posted to rec.radio.amateur.antenna
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315mhz/433mhz transmitter
On Thu, 19 Jul 2012 23:20:02 +0000, foxbrain
wrote: i'm just new to this field and i need some help on it and i appreciate any help... my aim is to make a 315 or 433 transmitter and receiver so what ics is the best for that and where can i buy them and so for the antennas(but i would like to build them)... This sounds like a school class project. If so, we should not be doing your homework as you will not learn anything. Some general direction: http://www.linxtechnologies.com/en/products/modules/kits http://www.rfsolutions.co.uk/acatalog/RF_Development.html http://www.ti.com/tool/cc1101dk433 http://www.radiotronix.com/products/proddb.asp?ProdID=216 etc. Google for "433 MHz development kit". These development kits are NOT cheap, but will give you a clue as to what's involved in the product development. For antennas, Google for "433 MHz antenna". There are plenty to choose from. Most likely, a 1/4 wave wire whip antenna will be sufficient. For antenna design help, Google for "433 MHz antenna design". This might be useful for comparing different types of antennas: http://www.ti.com/lit/an/swra161b/swra161b.pdf i want to make a remote control for 3 relays using the encoders/decoders There are also commerical products that do roughly what you propose. Reverse engineering the design and using similar components for your project is possible: http://www.ebay.com/itm/170740349762 http://www.ebay.com/itm/170854388957 etc... -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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#10
July 31st 12, 11:13 AM
posted to rec.radio.amateur.antenna
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315mhz/433mhz transmitter
ungli jigal talks about the story of four years life "Engineering Student"
http://www.youtube.com/watch?v=F-MweIUKAig subscribe for more footages |
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