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reactance -,+
Despite the resistive match between antenna and transmitter/receiver a reactive match is also required (with opposite sign). Non-zero reactance increases SWR of the antenna. Positive value of reactance means that antenna is too long (electrically, it's a simplification, but rather...
High Power .......??
Try a MOSFET-based design, such as this:
https://www.microsemi.com/micnotes/APT9903.pdf
It's for different frequency, but the whole idea behind stays the same.
Of course, an amplifier should be driven by oscillator. It is, however, possible to design an oscillator with 500W...
Computer Steering Wheel
The protocol is either USB HID class, or none at all.
In the former case You will have to implement an USB protocol device.
http://www.usb.org/developers/hidpage/
http://en.wikipedia.org/wiki/USB_Human_Interface_Device_class
This could be done even without a specialized...
All oscilloscopes i've seen had a AC/DC switch. In AC position it introduces a series capacitor in signal path, which decouples DC component. That makes AC signal + DC bias measurements quite easy.
It's a bit (or sometimes "a lot") harder to remove high voltage AC component, or to measure DC...
nyquist criteria
It is not necessary to limit band width of a signal which is being sampled.
Not doing so will result in a so called sampling mixer.
Baisicly, You will sample aliases. E.g. consider an input signal having a carrier of 10.7MHz. Sampling such a signal with ADC clocked at 10MHz...
Change the browser to a better one, like Firefox, or Opera...
I had the same problem long time ago with IE, it didn't display any polish diacritics, or sometimes display some of them, and even somtimes worked well. It was impossible to solve this problem neither by reinstalling IE, nor by...
Most (if not all) modern household equipement works fine with very wide supply voltage range. The only one of which I can think is a light bulb which will flicker.
Other devices that dislike fluctuating voltage are vacuum tube radios/amplifier/whatever.
So I would ask, why You need such a...
current
Current flow is not a result of potential difference.
Potential difference (or voltage drop) is a result of current flow.
To make a potential difference first of all there's need to be current flow from one point to another, which will move some charged particles (ions, electrons, or...
MP3 volume level
There's a better way than normalizing audio samples so that peak sample value is 100%.
It's called Replay Gain (ask google for details). It scans a song and then stores a tag in file with information about track's "loudness". It's different from usual normalization, cause it...
It depends whether You can or cannot use floating point operations.
If You can do that, simply multiply the floating point value by 2^(number_of_fractional_bits) and convert the result to integer. In C there's a libm function ldexp() as far as I remember, which provides fast multiplication of...
Those files are served by a PHP script, which checks whether You have clicked the link from the web site, or not. It's a protection from hot-linking the files to another web site.
The mechanism probably uses a HTTP header 'Referer' field, which includes the address of the site on which that link...
The simplest thing You can do is to filter the image with high-pass filter (two dimmensional convolution). Then You manipulate the camera lens until You get maximal amplitude of signal (calculated for example as RMS value). This approach applies only in a situation when You are able to take...
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