Tagged Questions

71 views

I am curious to know why can not signals of different tv stations mix together while transmitting. I have seen many towers built near each other in mountain areas in my country. If two different ...
67 views

Time limited and band limited signal

How can a time limited signal be of infinite bandwidth and a finite bandwidth signal be of infinite duration?
792 views

Sending data using 4 pin 3.5mm jack into smartphone

I have been looking around for some time and haven't found helpful information on how this is done. I am working on a project that intends to send data through the headphone jack to be processed by a ...
2k views

In a USB cable, is it OK to swap the D+ and D- wires?

I heard that D+ and D- are differential signals, does it matter if I swap them when connecting a USB device to the computer?
45 views

A uniform scalar quantizer

I have a uniform scalar quantizer with M=4 levels of quantization, and a natural mapping from levels to bits of the 01000110111110 Frame. Is it possible that this ...
135 views

Free space model (wireless communications)

The received power at a given distance = 1km is 1nW . Find the received power at a distance of 5km from the same transmitter , using the Free Space Model. Suppose that frequency is 1800Mhz, ...
1k views

transmitting 5v signal over a long cable

I'm seeking for help here as I need a reliable answer to this. I need to get an input signal (low frequency 5v digital pulse), to a micro-controller from a ...
121 views

What is the main downfall of using QPSK rather than DQPSK in fiber optics?

I've read that QPSK works theoretically in order to encode two bits depending on the phase of the signal. However, practically a reference for the carrier signal would be needed due to some ambiguity ...
122 views

Why would a whole region have severe difficulties with the railway “signalling system”?

The background for my question is that Oslo Central Station, Norway's main railway station, and the surrounding area keeps getting closed because of "signalling errors". The railway authority always ...
259 views

How are high-speed serial signals processed?

High-speed serial links such as Gb ethernet, PCIe, Firewire, etc support bit rates that suggest signalling frequencies far in excess of typical clocking speed of typical chips. I am wondering how ...
104 views

What's the difference between large and small scale signals

While reading about signal propagation, you encounter the two confusing terms, large-scale and small-scale. What's the difference between them! And what's the difference between the large-scale and ...
233 views

Can signal quality be affected by high temp?

I would like to know if UHF signal quality can be affected by hot weather? And which of UHF and VHF is better on that case of weather ?
841 views

What is speed of email? [closed]

I want to know how can we calculate speed of email. I guess that won't be same as speed of electricity or baud rate. I think it gets more complicated considering data doesn't travel in just one ...