At about 2:48 in the video about frequency sweeps, what are the possible reasons and consequences, if the dBmv and SNR is inversely proportional to frequency? That part was not covered in the video. I do not have a scanning tool like this but, on my cable modem for example, after a +15 dBmv amplifier that the install tech installed on "service activation", and "updates" that came a year later in other areas of their network that actually improved dBmv by +5 dBmv: After +15 dBmv amplifier: my modem observes 19 dBmv 44.4 SNR at 357 Mhz, and 11.2 dBmv 36.4 SNR at 969Mhz. Before the amplifier: my modem observes -9 dBmv at the 357 MHz range to -20 dBmv 969Mhz. I later added a couple splitters on my own so the highest dBmv is +15.5 now at 357Mhz, again. I am pretty-sure the install tech would have seen that slope a year ago as I did observe him using a scanner when deciding to add an amplifier, but I wasn't watching over his shoulder, lol. He did mention the dB levels being low and I did get -15 as an answer, which I later confirmed on my own some time later with the modem stat page. As computer tech and a person who likes to learn, I am researching for my own education, and because COX's service calls are 75 dollars (extra motivation to study!). as a self-taught person, having others do things for me makes me feel stupid, I'd rather just learn so I can do things anyway, lol. But I know I'm not an expert on everything too so I continue studying. Maybe I'll even apply to be a cable installer myself someday. I know that 150ft of RG6 cable going underground to my house is the reason for the power-drop and my install tech from COX just didn't bother doing anything about future planning about it, other than install an amplifier for an easy way out of fixing the problem the first time, but it did make things work. Possibly after some work, the coax could be upgraded to RG11 or something with less power drop/distance, and that would be compatible to future technologies, since this RG6 cable has been here at least 10 years when the house was built, but it's a guess from after researching coax. I am almost willing to upgrade my own cable but, underground crosses a road, lol. But, is the this also the cause of the power/freq spectrum slope?
Yes you have a bad drop probably ingress have them replace your drop with an rg11 if possible.If this can been fixed already you should have no signal impairements.
@@spacedreaming Bad cabling is 75 to 85 % of trouble calls.Your drop could also be affecting the plant I would ask to have it swapped out say that you are having T4 timeouts and bad snr at modem they should swap it for free.
Thank you for your question. Depending on your service, (OTA, SAT or CABLE SERVICE PROVIDER) will determine if you can split the signal to two DSTV Decoders. If the signal is free and clear on the cable such as OTA signals, than a traditional splitter will allow you to connect two devices. If using a cable service provider or satellite service providers service, you will be required to have a tuner to decode the digital signal. If the equipment you are using utilizes a cable card that is provided or activated by the service provider then splitting the signal is completely acceptable as the DSTV decoder will be able to decode the signal from these service providers.
You need to e very careful when choosing splitters............some splitters do not allow backward flow of current (from output to input)...............for this purpose you need "combiner"............just like if you want to use two antenna on a single Television...................and splitters can also increase resistance.......mostly if not powered...............
Can someone please explain the mystery of why RF Tilt/Slope is important and what affect if any does it have on performance?? I have searched Google and can't find an answer for this. Thanks for the help
CATV plant uses coaxial cable as its means of transport of RF frequencies over a long distance. Typical spectrum is 54 to 1002 MHz. These signals experience attenuation losses over a certain distance and will require amplification. This process guarantees a quality noise free signal and can be repeated many times. Again, coaxial cable loses more signal at higher frequencies resulting with input levels near or equal in amplitude to that of low frequencies at the next amplifier in cascade. To compensate for this one can adjust the amplifier the amplifier tilt so higher frequencies emulate the first amplifier output. Also, one can adjust the slope of the lower frequencies to match that of the fist amplifiers output. The end result is “unity gain” which is when amplifiers are spaced the same and effectively operate with same inputs and output. We hope this helps.
@@AmphenolBroadband thanks for your reply but i'm referring to the Tilt reading at the customer premises, not the network itself i.e the ISP i work for specify that the tilt read by the meter at the customer's premises must not be more than -6dbm or +6dbm.. If all the frequencies from lowest to highest are in spec i.e between -6dbm and +10dbm, then why does it matter if only the tilt is out of spec at the premises? Hope that makes sense
@@AmphenolBroadband I can only assume that if the tilt at the local amplifier/cabinet changes it will then of course affect the customer and possibly put their incoming signal out of spec, so if we aim to have a good tilt at the customer's CPE then this may help in the case of less than optimal network conditions. I've seen your label on our coax cable drums. Greetings from the UK
Great video, I learnt lots in a short space of time without any unnecessary commentary, thank you!
At about 2:48 in the video about frequency sweeps, what are the possible reasons and consequences, if the dBmv and SNR is inversely proportional to frequency? That part was not covered in the video.
I do not have a scanning tool like this but, on my cable modem for example, after a +15 dBmv amplifier that the install tech installed on "service activation", and "updates" that came a year later in other areas of their network that actually improved dBmv by +5 dBmv:
After +15 dBmv amplifier: my modem observes 19 dBmv 44.4 SNR at 357 Mhz, and 11.2 dBmv 36.4 SNR at 969Mhz.
Before the amplifier: my modem observes -9 dBmv at the 357 MHz range to -20 dBmv 969Mhz.
I later added a couple splitters on my own so the highest dBmv is +15.5 now at 357Mhz, again. I am pretty-sure the install tech would have seen that slope a year ago as I did observe him using a scanner when deciding to add an amplifier, but I wasn't watching over his shoulder, lol. He did mention the dB levels being low and I did get -15 as an answer, which I later confirmed on my own some time later with the modem stat page.
As computer tech and a person who likes to learn, I am researching for my own education, and because COX's service calls are 75 dollars (extra motivation to study!). as a self-taught person, having others do things for me makes me feel stupid, I'd rather just learn so I can do things anyway, lol. But I know I'm not an expert on everything too so I continue studying. Maybe I'll even apply to be a cable installer myself someday.
I know that 150ft of RG6 cable going underground to my house is the reason for the power-drop and my install tech from COX just didn't bother doing anything about future planning about it, other than install an amplifier for an easy way out of fixing the problem the first time, but it did make things work. Possibly after some work, the coax could be upgraded to RG11 or something with less power drop/distance, and that would be compatible to future technologies, since this RG6 cable has been here at least 10 years when the house was built, but it's a guess from after researching coax. I am almost willing to upgrade my own cable but, underground crosses a road, lol. But, is the this also the cause of the power/freq spectrum slope?
Yes you have a bad drop probably ingress have them replace your drop with an rg11 if possible.If this can been fixed already you should have no signal impairements.
@@edwardrodriguez3529 Thank you for the response. Yeah, I suspected RG11 would be more suitable for that distance. Still has not been upgraded.
@@spacedreaming Bad cabling is 75 to 85 % of trouble calls.Your drop could also be affecting the plant I would ask to have it swapped out say that you are having T4 timeouts and bad snr at modem they should swap it for free.
Cut it, throw it away, and go. Thanks, got it.
Hi all can I get a help, is it possible to connect more than one TV in one dstv decoder?
Thank you for your question.
Depending on your service, (OTA, SAT or CABLE SERVICE PROVIDER) will determine if you can split the signal to two DSTV Decoders.
If the signal is free and clear on the cable such as OTA signals, than a traditional splitter will allow you to connect two devices.
If using a cable service provider or satellite service providers service, you will be required to have a tuner to decode the digital signal.
If the equipment you are using utilizes a cable card that is provided or activated by the service provider then splitting the signal is completely acceptable as the DSTV decoder will be able to decode the signal from these service providers.
You need to e very careful when choosing splitters............some
splitters do not allow backward flow of current (from output to
input)...............for this purpose you need
"combiner"............just like if you want to use two antenna on a
single Television...................and splitters can also increase resistance.......mostly if not powered...............
Can someone please explain the mystery of why RF Tilt/Slope is important and what affect if any does it have on performance?? I have searched Google and can't find an answer for this. Thanks for the help
CATV plant uses coaxial cable as its means of transport of RF frequencies over a long distance. Typical spectrum is 54 to 1002 MHz. These signals experience attenuation losses over a certain distance and will require amplification. This process guarantees a quality noise free signal and can be repeated many times.
Again, coaxial cable loses more signal at higher frequencies resulting with input levels near or equal in amplitude to that of low frequencies at the next amplifier in cascade. To compensate for this one can adjust the amplifier the amplifier tilt so higher frequencies emulate the first amplifier output. Also, one can adjust the slope of the lower frequencies to match that of the fist amplifiers output.
The end result is “unity gain” which is when amplifiers are spaced the same and effectively operate with same inputs and output.
We hope this helps.
@@AmphenolBroadband thanks for your reply but i'm referring to the Tilt reading at the customer premises, not the network itself i.e the ISP i work for specify that the tilt read by the meter at the customer's premises must not be more than -6dbm or +6dbm.. If all the frequencies from lowest to highest are in spec i.e between -6dbm and +10dbm, then why does it matter if only the tilt is out of spec at the premises? Hope that makes sense
@@UA-camSupportTeams Good question.
@@AmphenolBroadband I can only assume that if the tilt at the local amplifier/cabinet changes it will then of course affect the customer and possibly put their incoming signal out of spec, so if we aim to have a good tilt at the customer's CPE then this may help in the case of less than optimal network conditions. I've seen your label on our coax cable drums. Greetings from the UK