Recent content by EEstudentNAU

I would like to take an incoming signal (digital or analog), invert it, and send it to an antenna. What is a simple high-level approach to this?

What will happen to the dry ice?

Imagine a tank with dry ice under high pressure, 150 psi or higher. A pipe carrying a fluid (with a freezing point lower than the temperature of the tank) passes through the tank with an initial temperature much higher than the tank. What will happen to the dry ice? I assume the temperature of...

As would I. Can anyone provide something? I am working with RF propagation, and far field region is defined as d>>wavelength. 10x? 20x? 100x?

Are LF transmitters and receivers readily available or as you said is this something I will have to build myself? Size is sort of an issue (smaller the better).

http://www.linxtechnologies.com/ The have some cheap TX/RX modules that can output the RSSI. Can this be compared to a reference voltage and if its lower, then it is outside the allowable range and sets off an alert? Because information is being exchanged, will I need a TX and RX on both...

Would Zigbee be a viable choice for this? What about transmitting in the Wi-Fi range? 2390 MHz to 2483 MHz http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr;sid=2452557b2d93f16c042e7628f028500d;rgn=div8;view=text;node=47%3A1.0.1.1.14.3.241.5;idno=47;cc=ecfr

I am in the US, and am currently unsure of what the regulations are. Skeptic2 has posted the following links:

I am interested in this method. Could you sort of give me a brief overview of a system that could do this? What sort of hardware am I looking at for this? Just how inaccurate are we talking? Less than a meter, more than a meter?

1) How easy must it be to build and test? Must be able to be built and tested by a college student with access to labs, etc. 2) How much can it cost? Cost is not an issue. 3) How big or heavy may it be? Must fit in someones pocket or on their belt. One unit ("control unit") will remain...

Hello, I am very new to this and don't know where to start. I am interested in establishing communication between two devices. The primary goal will be to frequently track the distance between these two objects, and if the distance takes on a certain value, execute some action. There is more...

Yeah I realized my mistake in asking for the force required, and apologize if it is unclear. I want to know how much torque is required to turn the shaft (rotor) of a large stationary motor with and without using a lever. Does this need to be measured, or is there data out there where I can...

Hello fellow members. I have a question and was wondering if someone could help me out. How could one figure out how much force is required to turn the shaft of say a large (9" diameter) DC motor directly from the shaft, and also with a lever of any length? Is there some sort of machine that has...

yeah

How do (PWR) nuclear plants determine how much fuel is left? Do they measure it? I heard they calculate it, but i was wondering if any measurement is done? Thanks.