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#11
Posted to sci.electronics.design,sci.electronics.repair,sci.physics,rec.audio.pro
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Could this device be built?
In sci.physics John Larkin wrote:
On Tue, 21 Aug 2007 16:25:02 GMT, wrote: In sci.physics John Larkin wrote: On Tue, 21 Aug 2007 15:15:02 GMT, wrote: In sci.physics John Larkin wrote: On Tue, 21 Aug 2007 04:25:03 GMT, wrote: In sci.physics John Larkin wrote: On Mon, 20 Aug 2007 22:25:02 GMT, wrote: OK, now you have some switched power, what generates the RF? Switched power *is* RF! Ummm, no. Switched power is just switched power. There has to be a microwave RF generator somewhere. Google "uwb transmitter". Good grief. A phased array requires precise phase (or frequency) control of the emitters to do the beam forming and aiming. How does one do that with a "uwb transmitter"? Timing. Point totally missed. Which phase (or frequency) of an Ultra Wide Band transmitter do you use? You can't use all of them. Do you have a PhD in what can't be done? No, but I have enough years of experience with RF in general and radar in particular to know building a phased array requires precise phase (or frequency) control and you can't do that with an ultra wideband device, which has a bandwidth of 500 Mhz. Such a device may make a great wireless LAN at ranges of tens of yards, but is not the device of choice for building a phased array anything. -- Jim Pennino Remove .spam.sux to reply. |
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