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#11
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You most likely will find a transistor for the rf output. Follow the emitter
to a resister. Reduce the value some. MORE POWER *grunt grunt* "Keith.fisher" wrote in message om... Hello, (Disclaimer - I am a novice electronics buff - just a few small projects) I have a small keychain remote used for advancing powerpoint slides. It has an integrated laser pointer that is very useful in presenting which is why I really want to get this to work.The remote is stated to be 433 mhz. The reciever is a small box about the size of a pack of cards. Right now it has a range of about 40 feet (the product spec says 100') I think it may have to do with the enviroment. We use it in a church and there are several wierless mics ect. I opened the recever and inside was a stiff wire antena bent into a square about 1.5 inchs per side. It is soldered onto the board. So I am wondering how I can increase the range of the transmitter/recever. Can I just solder a longer antena? If possible I would like it to be somewhat omni directinal. The product spec says it is (is that why the square ant and not a long skinny one???) Also while looking online I see places that sell 433 mhz ant's for about 15$- They are made (I think) for handheld walki-talkies(??) would somthing like this help me. Any help would be much appreciated! Thanx! Keith |
#12
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Thanx all for the info on the antenna. I looked in the recever and
found the antena is *gasp* about 6.5 inches long!!! It is bent inside the case into a square. So if I was to straighten and piont it straght up would this help with range? Is the reason it is bent inside just to hide and make the recever smaller or is it somehowe helping the recever be omnidirectional? Agian - thanx for all the input!!! KEith [snip] You may be better off putting a better antenna at the receiver end. The optimum would be a 1/4 wavelength. Hey, anybody out there remember the damn equation for this... 300,000 meters per second devided by something-or-other??? A wavelength of 1 meter is a frequency of 300 MHz. So 433 MHz will have a wavelength of (300/433) meters, or 9/13 meters. A 1/4-wave antenna would be (1/4)*(9/13) meters long, which is 9/52 meters long -- which is just a teeny bit longer than 9/54 meters, and that's 1/6 of a meter, or (1/6)* 39.37 inches, or just a smidgen over 6.5 inches long -- and all that assumes I did the arithmetic right. Since I'm a math jock, there's no guarantee I did, so check it yourselves. I just fired up the 4-banger calculator, and it tells me that the 1/4-wave antenna should be 6.819+ inches long, so 6.5 is a good ballpark figure. |
#13
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Thanx all for the info on the antenna. I looked in the recever and
found the antena is *gasp* about 6.5 inches long!!! It is bent inside the case into a square. So if I was to straighten and piont it straght up would this help with range? Is the reason it is bent inside just to hide and make the recever smaller or is it somehowe helping the recever be omnidirectional? Agian - thanx for all the input!!! KEith [snip] You may be better off putting a better antenna at the receiver end. The optimum would be a 1/4 wavelength. Hey, anybody out there remember the damn equation for this... 300,000 meters per second devided by something-or-other??? A wavelength of 1 meter is a frequency of 300 MHz. So 433 MHz will have a wavelength of (300/433) meters, or 9/13 meters. A 1/4-wave antenna would be (1/4)*(9/13) meters long, which is 9/52 meters long -- which is just a teeny bit longer than 9/54 meters, and that's 1/6 of a meter, or (1/6)* 39.37 inches, or just a smidgen over 6.5 inches long -- and all that assumes I did the arithmetic right. Since I'm a math jock, there's no guarantee I did, so check it yourselves. I just fired up the 4-banger calculator, and it tells me that the 1/4-wave antenna should be 6.819+ inches long, so 6.5 is a good ballpark figure. |
#14
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Hmmm...More power..I like it! I am going to play with the ant on the
recever some more but I may just crack open the transmitter if all else fails... Thanx KEith "Check It Out" wrote in message ... You most likely will find a transistor for the rf output. Follow the emitter to a resister. Reduce the value some. MORE POWER *grunt grunt* "Keith.fisher" wrote in message om... Hello, (Disclaimer - I am a novice electronics buff - just a few small projects) I have a small keychain remote used for advancing powerpoint slides. It has an integrated laser pointer that is very useful in presenting which is why I really want to get this to work.The remote is stated to be 433 mhz. The reciever is a small box about the size of a pack of cards. Right now it has a range of about 40 feet (the product spec says 100') I think it may have to do with the enviroment. We use it in a church and there are several wierless mics ect. I opened the recever and inside was a stiff wire antena bent into a square about 1.5 inchs per side. It is soldered onto the board. So I am wondering how I can increase the range of the transmitter/recever. Can I just solder a longer antena? If possible I would like it to be somewhat omni directinal. The product spec says it is (is that why the square ant and not a long skinny one???) Also while looking online I see places that sell 433 mhz ant's for about 15$- They are made (I think) for handheld walki-talkies(??) would somthing like this help me. Any help would be much appreciated! Thanx! Keith |
#15
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Hmmm...More power..I like it! I am going to play with the ant on the
recever some more but I may just crack open the transmitter if all else fails... Thanx KEith "Check It Out" wrote in message ... You most likely will find a transistor for the rf output. Follow the emitter to a resister. Reduce the value some. MORE POWER *grunt grunt* "Keith.fisher" wrote in message om... Hello, (Disclaimer - I am a novice electronics buff - just a few small projects) I have a small keychain remote used for advancing powerpoint slides. It has an integrated laser pointer that is very useful in presenting which is why I really want to get this to work.The remote is stated to be 433 mhz. The reciever is a small box about the size of a pack of cards. Right now it has a range of about 40 feet (the product spec says 100') I think it may have to do with the enviroment. We use it in a church and there are several wierless mics ect. I opened the recever and inside was a stiff wire antena bent into a square about 1.5 inchs per side. It is soldered onto the board. So I am wondering how I can increase the range of the transmitter/recever. Can I just solder a longer antena? If possible I would like it to be somewhat omni directinal. The product spec says it is (is that why the square ant and not a long skinny one???) Also while looking online I see places that sell 433 mhz ant's for about 15$- They are made (I think) for handheld walki-talkies(??) would somthing like this help me. Any help would be much appreciated! Thanx! Keith |
#16
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#17
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