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"erdem" wrote in message m... Actually I am not trying to design antennas ( 500Mhz to 1Ghz- I guess this gives you information about what sort they are), I am trying to buy them on a pcb or small chips that could be mounted on a PCB. Your wavelength of interest is 3cm at a minimum... you're trying to put them into a box smaller than that. How much gain should this antenna have? How broad-banded does it have to be? How much power does it have to handle? What kind of polarization do I want? These are basic questions you should answer. __ Steve KI5YG/EA .. |
I am trying to build rf transmitter and receiver that could transfer
information (doors open closed, light on, etc, etc) from my car in the parking lot to my office desk. The distance is about 100m. I would like to have the receiver to be very small-key chain size. Therefore I thought high frequency might result in a smaller antenna. Most probably bandwidth will be very small (I do not need high speed data transfer). I am not sure about the polarization issue. About the power, that depends on the design, most probably. I am planning to use the IC from; http://www.maxim-ic.com/Wireless.cfm Is it possible to do this kind of a device that small? Adam " Stephen Cowell" wrote in message ... "erdem" wrote in message m... Actually I am not trying to design antennas ( 500Mhz to 1Ghz- I guess this gives you information about what sort they are), I am trying to buy them on a pcb or small chips that could be mounted on a PCB. Your wavelength of interest is 3cm at a minimum... you're trying to put them into a box smaller than that. How much gain should this antenna have? How broad-banded does it have to be? How much power does it have to handle? What kind of polarization do I want? These are basic questions you should answer. __ Steve KI5YG/EA . |
I am trying to build rf transmitter and receiver that could transfer
information (doors open closed, light on, etc, etc) from my car in the parking lot to my office desk. The distance is about 100m. I would like to have the receiver to be very small-key chain size. Therefore I thought high frequency might result in a smaller antenna. Most probably bandwidth will be very small (I do not need high speed data transfer). I am not sure about the polarization issue. About the power, that depends on the design, most probably. I am planning to use the IC from; http://www.maxim-ic.com/Wireless.cfm Is it possible to do this kind of a device that small? Adam " Stephen Cowell" wrote in message ... "erdem" wrote in message m... Actually I am not trying to design antennas ( 500Mhz to 1Ghz- I guess this gives you information about what sort they are), I am trying to buy them on a pcb or small chips that could be mounted on a PCB. Your wavelength of interest is 3cm at a minimum... you're trying to put them into a box smaller than that. How much gain should this antenna have? How broad-banded does it have to be? How much power does it have to handle? What kind of polarization do I want? These are basic questions you should answer. __ Steve KI5YG/EA . |
"erdem" wrote in message om... I am trying to build rf transmitter and receiver that could transfer information (doors open closed, light on, etc, etc) from my car in the parking lot to my office desk. The distance is about 100m. I would like to have the receiver to be very small-key chain size. Therefore I thought high frequency might result in a smaller antenna. Most probably bandwidth will be very small (I do not need high speed data transfer). I am not sure about the polarization issue. About the power, that depends on the design, most probably. I am planning to use the IC from; http://www.maxim-ic.com/Wireless.cfm Is it possible to do this kind of a device that small? Easily... as long as all it has to do is receive. You can pump out 20W of UHF RF from your car, you'll hear it without any antenna at all inside, probably. Your concerns are path loss (not that much through the walls of the building) and receiver antenna inefficiency (the greater of the two, since you put a small size limit). Perhaps you're talking about this chip: http://www.maxim-ic.com/view_press_r...release_id/932 Pretty impressive, I must say... looks like fun. Keeping this On Topic for r.r.a.a, I'd start with a piece of wire 1/4 wave long, run around the perimeter of your device, as an antenna. __ Steve KI5YG/EA .. PS Make sure that you address any legal considerations about one-way automatic transmissions. |
"erdem" wrote in message om... I am trying to build rf transmitter and receiver that could transfer information (doors open closed, light on, etc, etc) from my car in the parking lot to my office desk. The distance is about 100m. I would like to have the receiver to be very small-key chain size. Therefore I thought high frequency might result in a smaller antenna. Most probably bandwidth will be very small (I do not need high speed data transfer). I am not sure about the polarization issue. About the power, that depends on the design, most probably. I am planning to use the IC from; http://www.maxim-ic.com/Wireless.cfm Is it possible to do this kind of a device that small? Easily... as long as all it has to do is receive. You can pump out 20W of UHF RF from your car, you'll hear it without any antenna at all inside, probably. Your concerns are path loss (not that much through the walls of the building) and receiver antenna inefficiency (the greater of the two, since you put a small size limit). Perhaps you're talking about this chip: http://www.maxim-ic.com/view_press_r...release_id/932 Pretty impressive, I must say... looks like fun. Keeping this On Topic for r.r.a.a, I'd start with a piece of wire 1/4 wave long, run around the perimeter of your device, as an antenna. __ Steve KI5YG/EA .. PS Make sure that you address any legal considerations about one-way automatic transmissions. |
Adam, before you get all wound up over building a system from scratch, why
not consult some security and alarm companies, and see what they have available...? - KI6PR "erdem" wrote I am trying to build rf transmitter and receiver that could transfer information (doors open closed, light on, etc, etc) from my car in the parking lot to my office desk. The distance is about 100m. I would like to have the receiver to be very small-key chain size. Therefore I thought high frequency might result in a smaller antenna. Most probably bandwidth will be very small (I do not need high speed data transfer). I am not sure about the polarization issue. About the power, that depends on the design, most probably. I am planning to use the IC from; http://www.maxim-ic.com/Wireless.cfm Is it possible to do this kind of a device that small? Adam " Stephen Cowell" wrote in message ... "erdem" wrote in message m... Actually I am not trying to design antennas ( 500Mhz to 1Ghz- I guess this gives you information about what sort they are), I am trying to buy them on a pcb or small chips that could be mounted on a PCB. Your wavelength of interest is 3cm at a minimum... you're trying to put them into a box smaller than that. How much gain should this antenna have? How broad-banded does it have to be? How much power does it have to handle? What kind of polarization do I want? These are basic questions you should answer. __ Steve KI5YG/EA . |
Adam, before you get all wound up over building a system from scratch, why
not consult some security and alarm companies, and see what they have available...? - KI6PR "erdem" wrote I am trying to build rf transmitter and receiver that could transfer information (doors open closed, light on, etc, etc) from my car in the parking lot to my office desk. The distance is about 100m. I would like to have the receiver to be very small-key chain size. Therefore I thought high frequency might result in a smaller antenna. Most probably bandwidth will be very small (I do not need high speed data transfer). I am not sure about the polarization issue. About the power, that depends on the design, most probably. I am planning to use the IC from; http://www.maxim-ic.com/Wireless.cfm Is it possible to do this kind of a device that small? Adam " Stephen Cowell" wrote in message ... "erdem" wrote in message m... Actually I am not trying to design antennas ( 500Mhz to 1Ghz- I guess this gives you information about what sort they are), I am trying to buy them on a pcb or small chips that could be mounted on a PCB. Your wavelength of interest is 3cm at a minimum... you're trying to put them into a box smaller than that. How much gain should this antenna have? How broad-banded does it have to be? How much power does it have to handle? What kind of polarization do I want? These are basic questions you should answer. __ Steve KI5YG/EA . |
Before I start this circuit, could you guys suggest me any references
to look maybe, about some high freq. rf design tricks, etc Thanks, Adam " Stephen Cowell" wrote in message ... "erdem" wrote in message om... I am trying to build rf transmitter and receiver that could transfer information (doors open closed, light on, etc, etc) from my car in the parking lot to my office desk. The distance is about 100m. I would like to have the receiver to be very small-key chain size. Therefore I thought high frequency might result in a smaller antenna. Most probably bandwidth will be very small (I do not need high speed data transfer). I am not sure about the polarization issue. About the power, that depends on the design, most probably. I am planning to use the IC from; http://www.maxim-ic.com/Wireless.cfm Is it possible to do this kind of a device that small? Easily... as long as all it has to do is receive. You can pump out 20W of UHF RF from your car, you'll hear it without any antenna at all inside, probably. Your concerns are path loss (not that much through the walls of the building) and receiver antenna inefficiency (the greater of the two, since you put a small size limit). Perhaps you're talking about this chip: http://www.maxim-ic.com/view_press_r...release_id/932 Pretty impressive, I must say... looks like fun. Keeping this On Topic for r.r.a.a, I'd start with a piece of wire 1/4 wave long, run around the perimeter of your device, as an antenna. __ Steve KI5YG/EA . PS Make sure that you address any legal considerations about one-way automatic transmissions. |
Before I start this circuit, could you guys suggest me any references
to look maybe, about some high freq. rf design tricks, etc Thanks, Adam " Stephen Cowell" wrote in message ... "erdem" wrote in message om... I am trying to build rf transmitter and receiver that could transfer information (doors open closed, light on, etc, etc) from my car in the parking lot to my office desk. The distance is about 100m. I would like to have the receiver to be very small-key chain size. Therefore I thought high frequency might result in a smaller antenna. Most probably bandwidth will be very small (I do not need high speed data transfer). I am not sure about the polarization issue. About the power, that depends on the design, most probably. I am planning to use the IC from; http://www.maxim-ic.com/Wireless.cfm Is it possible to do this kind of a device that small? Easily... as long as all it has to do is receive. You can pump out 20W of UHF RF from your car, you'll hear it without any antenna at all inside, probably. Your concerns are path loss (not that much through the walls of the building) and receiver antenna inefficiency (the greater of the two, since you put a small size limit). Perhaps you're talking about this chip: http://www.maxim-ic.com/view_press_r...release_id/932 Pretty impressive, I must say... looks like fun. Keeping this On Topic for r.r.a.a, I'd start with a piece of wire 1/4 wave long, run around the perimeter of your device, as an antenna. __ Steve KI5YG/EA . PS Make sure that you address any legal considerations about one-way automatic transmissions. |
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