High Frequency Signals & BNC Cables: Explained

AI Thread Summary
BNC cables are designed to transmit high-frequency signals effectively, which refers to alternating current (AC) signals that oscillate at high rates, rather than direct current (DC) signals. In the context of connecting devices like diode controllers and photodiodes, high-frequency signals can include the modulation or variations in the DC signal, which may not be immediately apparent. While BNC cables excel at shielding against interference from external radio signals, they can also transmit lower frequency signals, although with increased loss as frequency decreases. Understanding the frequency characteristics of the signals being transmitted is crucial for optimizing performance and minimizing signal degradation. The discussion highlights the importance of selecting the right cable type for specific applications based on frequency requirements.
cks
Messages
164
Reaction score
0
Hihi,

I don't understand what is the meaning that BNC cable transfer high frequency signal?

For example, I use BNC cable for the connection between my diode controller to the diode laser. I also use BNC cable to connect my photodiode to the oscilloscope.

I'm not sure what is the meaning of high frequency signal here? Is the signal transmitting has high frequency? but the voltage to my diode is a direct current, so where comes the frequency?? a bit confused.

I know the BNC cable can shield away from picking up radio signal and antennas from somewhere else, but what is high frequency mean here? Can it transmit low frequency?
 
Engineering news on Phys.org
Coax can be used from DC to its cutoff frequency, although its loss can be significant well before its cutoff frequency.

Twisted pair makes a fine transmission line too, but does not have the self-shielding feature of coax.
 

Thread 'Underwater piezoelectric sensor array receive sensitivity'

Hi all I have some confusion about piezoelectrical sensors combination. If i have three acoustic piezoelectrical sensors (with same receive sensitivity in dB ref V/1uPa) placed at specific distance, these sensors receive acoustic signal from a sound source placed at far field distance (Plane Wave) and from broadside. I receive output of these sensors through individual preamplifiers, add them through hardware like summer circuit adder or in software after digitization and in this way got an...
View full post »

Thread 'Following up on the recent thread about Earth Resistance measurements'

I have recently moved into a new (rather ancient) house and had a few trips of my Residual Current breaker. I dug out my old Socket tester which tell me the three pins are correct. But then the Red warning light tells me my socket(s) fail the loop test. I never had this before but my last house had an overhead supply with no Earth from the company. The tester said "get this checked" and the man said the (high but not ridiculous) earth resistance was acceptable. I stuck a new copper earth...
View full post »
Thread 'Beauty of old electrical and measuring things, etc.'

Thread 'Beauty of old electrical and measuring things, etc.'

Even as a kid, I saw beauty in old devices. That made me want to understand how they worked. I had lots of old things that I keep and now reviving. Old things need to work to see the beauty. Here's what I've done so far. Two views of the gadgets shelves and my small work space: Here's a close up look at the meters, gauges and other measuring things: This is what I think of as surface-mount electrical components and wiring. The components are very old and shows how...
View full post »

Similar threads

Converting oscilloscope voltage to laser power
Replies
12
Views
2K
Finding Piezoelectric Crystal Frequency for Coherer experiment?
Replies
15
Views
2K
Synchro Signal Frequency changes
Replies
36
Views
4K
Using two connected Yagi antennas to "bend" a mobile signal
Replies
18
Views
4K
Cannot lock reference signal on lock-in amplifier
Replies
5
Views
2K
Impedance matching of transmission line to source impedance
Replies
15
Views
5K
How can I convert audio signals into pulses for radio transmission?
Replies
20
Views
2K
Help w/ Signal Generator (voltage varies w/ freq adjustment)
Replies
11
Views
4K
Does the size of an antenna matter?
Replies
3
Views
5K
Minimum Frequency of FM Data / Catastrophic Error Scenario?
2
Replies
68
Views
5K

Hot Threads

Recent Insights

Back
Top