We use a program called Yeti, and I can remove anyone of the 4 carriers to see noise. Also I can see if the errors are correctable or uncorrected in any of the 4 carriers along with snr.
first thing i do when i get this is put my radio on an empty am channel like 960, and drive the node. for us it usually gets in from a bad power insulator and shows on all ports. a bad insulator causes a crazy loud hum, and buzzing when right on top of it just like with a leakage meter squealing. the electrical noise level changes with weather, and humidity. getting the power company out to find, and replace the bad one allowing their field to radiate into the plant is another story. most of our distribution is no longer powered since we dropped then old cornerstone and voiceports years ago. with node +1 or 2 you may get it on more than one node that is close by. it can get high enough to clip your laser too
Does PathTrack have the ability to subtract the actual symbol transmits, so you can see the power beneath the carrier? Using dwell times to attempt to find noise under the carrier seems fraught with potential alias' showing false positives / false negatives, even moreso when attempting to find spurious beneath carriers.
Not that have seen. On very busy nodes it is hard to see the noise behind the carriers. However, after using Pathtrak for a while you get pretty good at spotting noise where it shouldn't be.
@@thebasiccablechannel7464 I did a little bit of research, and found that there is in fact a viavi solution that does as I suggested. www.viavisolutions.com/en-us/product-flashes/track-down-ingress-and-noise-faster-and-easier www.viavisolutions.com/ru-ru/literature/analyzing-impulse-noise-oneexpert-catv-ingress-expert-application-notes-en.pdf See if you can get your hands on this kit, the ability to subtract the known docsis burst-symbols from the spectrum view to see non-docsis power should help you tremendously when it comes to identifying and troubleshooting this kind of impairment. I'm in no way connected to viavi.
It is a web based spectrum analyze through Viavi called "Pathtrak". It requires equipment in the MTC or headend to be plugged into the incoming traffic with a splitter so it can be monitored like this.
Love these videos! Keep em coming
@thebasiccablechannel7464 yes please
We use a program called Yeti, and I can remove anyone of the 4 carriers to see noise. Also I can see if the errors are correctable or uncorrected in any of the 4 carriers along with snr.
My color is terrible but what is the greenish looking line under the carriers when you extended the dwell time?
first thing i do when i get this is put my radio on an empty am channel like 960, and drive the node. for us it usually gets in from a bad power insulator and shows on all ports. a bad insulator causes a crazy loud hum, and buzzing when right on top of it just like with a leakage meter squealing. the electrical noise level changes with weather, and humidity. getting the power company out to find, and replace the bad one allowing their field to radiate into the plant is another story. most of our distribution is no longer powered since we dropped then old cornerstone and voiceports years ago. with node +1 or 2 you may get it on more than one node that is close by. it can get high enough to clip your laser too
How do you find where this is coming from? Say you have a line with 4 taps.
Does PathTrack have the ability to subtract the actual symbol transmits, so you can see the power beneath the carrier? Using dwell times to attempt to find noise under the carrier seems fraught with potential alias' showing false positives / false negatives, even moreso when attempting to find spurious beneath carriers.
Not that have seen. On very busy nodes it is hard to see the noise behind the carriers. However, after using Pathtrak for a while you get pretty good at spotting noise where it shouldn't be.
@@thebasiccablechannel7464 I did a little bit of research, and found that there is in fact a viavi solution that does as I suggested.
www.viavisolutions.com/en-us/product-flashes/track-down-ingress-and-noise-faster-and-easier
www.viavisolutions.com/ru-ru/literature/analyzing-impulse-noise-oneexpert-catv-ingress-expert-application-notes-en.pdf
See if you can get your hands on this kit, the ability to subtract the known docsis burst-symbols from the spectrum view to see non-docsis power should help you tremendously when it comes to identifying and troubleshooting this kind of impairment.
I'm in no way connected to viavi.
How are you able to see this? Are you using your meter?
It is a web based spectrum analyze through Viavi called "Pathtrak". It requires equipment in the MTC or headend to be plugged into the incoming traffic with a splitter so it can be monitored like this.
Guy wire touching cable plant