Home |
Search |
Today's Posts |
![]() |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#81
![]()
Posted to sci.electronics.repair,rec.radio.amateur.antenna,sci.electronics.design
|
|||
|
|||
![]()
In message , Michael A.
Terrell writes amdx wrote: On 2/10/2012 8:11 PM, Jeff Liebermann wrote: ? On Fri, 10 Feb 2012 11:47:54 -0600, ? ? wrote: ? ?? The Box is a CISCO RNG100 ?? Only data I know how to get is; ?? Tuner 537.00 Mhz 2dbmv ?? TDC 75.25 Mhz 5dbmv ?? RDC 20.00 Mhz 30.0dbmv Yes 30.0 ?? ? ? It's the same as the Cisco Explorer 1540C with some features removed ? by Comcast. ? ?http://www.cincinnatibell.com/shared...40_uguide.pdf? ? ? How to get into the diagnostics: ? Press and hold SELECT on front of unit until the MAIL light ? starts to flash, then press INFO. ? Or ? Press and hold PAUSE on remote until MAIL light starts to ? flash (around 10-15 seconds), then press PAGE-UP (-). ? On some remotes, PAGE (+) might need to be used instead. ? See if you can excavate the SNR numbers. Maybe there's RF garbage on ? the systems (oscillating distribution amp, ingress, whatever, etc). Hi Jeff, I don't seem to be able to follow your directions, I don't think I have enough buttons. To get the info I posted, Push and hold the power button until the power light blinks, then push power again and the info screen comes up. I don't know what the MAIL light is, I don't have a select button nor a INFO button. Hey started pushing buttons on the remote, found I can scroll through 15 pages off stuuf I don't have a clue about. Got some "RF Statistics on page 5" Current FDC Freq. 75.250 Level 5 dbmv S/N 29db Errs/Ave 0/0 Current Qam Freq. 513 Mhz Level -1dbmv S/N 35db Errs/Ave 11/0 or 11/1 or 11/3 but mostly 11/0 It shows that you have a 6 dB slope, and the high end is 1 dBmv below the standard level. It also shows a lot of errors in the recovered data. QAM is the digital TV signal. Unscrambled channels are referred to as Clear QAM Presumably 75.25MHz is an analogue signal? In the UK, at least while the cable system has carried a mixture of analogues and digitals, the digitals have been run 10dB below the analogues. If 75.25MHz had been digital, it would be set at -5dBmV, so there would be a rising slope of 4dB, LF to HF. In any case, if the 513MHz digital is -1dBmV, and other HF signals are similar, that is more than sufficient for a digital set-top box. I would think it should work reliably down to around -15dBmV. If I'm right, whatever the problem is, it isn't being caused by a lack of signal level. -- Ian |
#82
![]()
Posted to sci.electronics.repair,rec.radio.amateur.antenna,sci.electronics.design
|
|||
|
|||
![]()
Michael A. Terrell wrote:
Joerg wrote: Michael A. Terrell wrote: ? Joerg wrote: ?? http://www.cablefax.com/ct/sections/...ier_44237.html ?? ?? Quote "The Multimedia Over Coax Alliance (MoCA) provides a standard ..." ?? ?? then ?? ?? Quote "The maximum cable distance supported between the root and the ?? last outlet is 300 feet, with a maximum attenuation of 25 dB". And this ?? is for MoCA, not just cable TV. ? ? ? MoCA is home networking, hence the 300 foot figure. A drop at +10 ? dBmv already allows a 25 dB loss for the cable modem, since they are ? designed to work to -15 dBmv. That webpage also mentions verifing that a ? "drop amplifier does not block Moca". In other words, it's home ? networking for multimedia devices and has nothing to do with the length ? of the cable drop. It is to allow customers to stream audio and video ? within their home, and use services like Netflix ? Hulu on their TV ? sets. ? It is the modern cable TV, like it or not. Sigh. You never back down, even when you are shown that you are wrong. Because I am not. http://publicservice.vermont.gov/con...rts_cable.html Quote "If its under 300 feet, its free to the consumer". Yes, it is as simple as that. You are within 300ft and the cable company must serve you. This is state-of-the-art. Now you'll probably declare the whole State of Vermont to be wrong? [...] -- Regards, Joerg http://www.analogconsultants.com/ |
#83
![]()
Posted to sci.electronics.repair,rec.radio.amateur.antenna,sci.electronics.design
|
|||
|
|||
![]()
On Sun, 12 Feb 2012 13:54:36 -0800, Joerg wrote:
Michael A. Terrell wrote: Joerg wrote: Michael A. Terrell wrote: ? Joerg wrote: ?? http://www.cablefax.com/ct/sections/...ier_44237.html ?? ?? Quote "The Multimedia Over Coax Alliance (MoCA) provides a standard ..." ?? ?? then ?? ?? Quote "The maximum cable distance supported between the root and the ?? last outlet is 300 feet, with a maximum attenuation of 25 dB". And this ?? is for MoCA, not just cable TV. ? ? ? MoCA is home networking, hence the 300 foot figure. A drop at +10 ? dBmv already allows a 25 dB loss for the cable modem, since they are ? designed to work to -15 dBmv. That webpage also mentions verifing that a ? "drop amplifier does not block Moca". In other words, it's home ? networking for multimedia devices and has nothing to do with the length ? of the cable drop. It is to allow customers to stream audio and video ? within their home, and use services like Netflix ? Hulu on their TV ? sets. ? It is the modern cable TV, like it or not. Sigh. You never back down, even when you are shown that you are wrong. Because I am not. http://publicservice.vermont.gov/con...rts_cable.html Quote "If its under 300 feet, its free to the consumer". Yes, it is as simple as that. You are within 300ft and the cable company must serve you. This is state-of-the-art. Now you'll probably declare the whole State of Vermont to be wrong? The whole state? Na, there's probably three sane people left. |
#85
![]()
Posted to sci.electronics.repair,rec.radio.amateur.antenna,sci.electronics.design
|
|||
|
|||
![]() " wrote: On Sun, 12 Feb 2012 13:54:36 -0800, Joerg wrote: Michael A. Terrell wrote: Joerg wrote: Michael A. Terrell wrote: ? Joerg wrote: ?? http://www.cablefax.com/ct/sections/...ier_44237.html ?? ?? Quote "The Multimedia Over Coax Alliance (MoCA) provides a standard ..." ?? ?? then ?? ?? Quote "The maximum cable distance supported between the root and the ?? last outlet is 300 feet, with a maximum attenuation of 25 dB". And this ?? is for MoCA, not just cable TV. ? ? ? MoCA is home networking, hence the 300 foot figure. A drop at +10 ? dBmv already allows a 25 dB loss for the cable modem, since they are ? designed to work to -15 dBmv. That webpage also mentions verifing that a ? "drop amplifier does not block Moca". In other words, it's home ? networking for multimedia devices and has nothing to do with the length ? of the cable drop. It is to allow customers to stream audio and video ? within their home, and use services like Netflix ? Hulu on their TV ? sets. ? It is the modern cable TV, like it or not. Sigh. You never back down, even when you are shown that you are wrong. Because I am not. http://publicservice.vermont.gov/con...rts_cable.html Quote "If its under 300 feet, its free to the consumer". Yes, it is as simple as that. You are within 300ft and the cable company must serve you. This is state-of-the-art. Now you'll probably declare the whole State of Vermont to be wrong? The whole state? Na, there's probably three sane people left. The FCC says the requirement is 100 feet in CFR 47-46.606, section three, quoted below: --- (3) The visual signal level, across a terminating impedance which correctly matches the internal impedance of the cable system as viewed from the subscriber terminal, shall not be less than 1 millivolt across an internal impedance of 75 ohms (0 dBmV). Additionally, as measured at the end of a 30 meter (100 foot) cable drop that is connected to the subscriber tap, it shall not be less than 1.41 millivolts across an internal impedance of 75 ohms (+3 dBmV). (At other impedance values, the minimum visual signal level, as viewed from the subscriber terminal, shall be the square root of 0.0133 (Z) millivolts and, as measured at the end of a 30 meter (100 foot) cable drop that is connected to the subscriber tap, shall be 2 times the square root of 0.00662(Z) millivolts, where Z is the appropriate impedance value.) --- That mess in Vermont involves Adelphia cable, and the settlement of a huge fraud lawsuit. They agreed to build to a minimum of 14 homes per mile, when the industry usually stops at 35-40 homes per mile as ever paying back the construction costs. Vermont had them by the balls, if they wanted to renew their franchisee. Adelphia is also heavily invested in FIOS. The other franchises I looked at only had a 300 foot limit if it was Fiber to the structure, which doesn't have the roll off and insertion loss of coax. Here is a typical RG6 from Belden: Freq. (MHz) Attenuation (dB/100 ft.) 5 .67 55 1.60 211 2.87 270 3.24 300 3.43 350 3.72 400 4.00 450 4.26 550 4.71 750 5.59 870 6.00 1000 6.54 This shows the loss at 12.78 dB at 450 MHz which would be a very old system. -- You can't have a sense of humor, if you have no sense. |
#86
![]()
Posted to sci.electronics.repair,rec.radio.amateur.antenna,sci.electronics.design
|
|||
|
|||
![]()
On Sat, 11 Feb 2012 14:04:58 -0500, "Michael A. Terrell"
wrote: 3: You know nothing about CATV franchises. 'A measly 100 feet' is more than adequate for a hell of a lot of drops & house wiring. If that is what the franchise calls for, THAT IS THE SPECIFICATION, no matter how much you whine like Sloman. A city or county won't pull a franchise over one or two people complaining about weak signals. They receive a fixed percentage of the system revenue every month, and the percentage was set when the economy was up. If they pull the franchise, another provider will offer a much lower percentage. It also involves legal fees, and causes the rates to go up for the users. Why put up with all that for a fraction of a percent of problems. Like people who built a private road a mile long and want to pay the standard install fee when it will cost about $15,000 to run a feeder for that one house. Or like that marina. It isn't a street. It's private property. If they want better service, let them pay for upgrades with .500 cable to each boat, with a .500 to 'F" connector for each boat. That would only cost a few hundred dollars a boat for materials. More if the cable is jacketed. If it isn't it won't last long in salt air. Double that for the hardware and labor to get a good idea of the costs. Oh, that's right. You're too cheap to even have cable TV. Read more carefully. I said TV doesn't matter to us, it is not about cost. Then why are you being such an ignorant prick about the issue when you have no horse in the race? You sound more like Dimbulb every day. I used to think highly of you, but no longer Geez Michael, one stupid thread and you trash years of positive experience? Just the same, i didn't expect him to even think of pretending knowledge where he was not well versed in the specific area under discussion. -- You can't have a sense of humor, if you have no sense. |
#87
![]()
Posted to sci.electronics.repair,rec.radio.amateur.antenna,sci.electronics.design
|
|||
|
|||
![]() josephkk wrote: On Sat, 11 Feb 2012 14:04:58 -0500, "Michael A. Terrell" wrote: 3: You know nothing about CATV franchises. 'A measly 100 feet' is more than adequate for a hell of a lot of drops & house wiring. If that is what the franchise calls for, THAT IS THE SPECIFICATION, no matter how much you whine like Sloman. A city or county won't pull a franchise over one or two people complaining about weak signals. They receive a fixed percentage of the system revenue every month, and the percentage was set when the economy was up. If they pull the franchise, another provider will offer a much lower percentage. It also involves legal fees, and causes the rates to go up for the users. Why put up with all that for a fraction of a percent of problems. Like people who built a private road a mile long and want to pay the standard install fee when it will cost about $15,000 to run a feeder for that one house. Or like that marina. It isn't a street. It's private property. If they want better service, let them pay for upgrades with .500 cable to each boat, with a .500 to 'F" connector for each boat. That would only cost a few hundred dollars a boat for materials. More if the cable is jacketed. If it isn't it won't last long in salt air. Double that for the hardware and labor to get a good idea of the costs. Oh, that's right. You're too cheap to even have cable TV. Read more carefully. I said TV doesn't matter to us, it is not about cost. Then why are you being such an ignorant prick about the issue when you have no horse in the race? You sound more like Dimbulb every day. I used to think highly of you, but no longer Geez Michael, one stupid thread and you trash years of positive experience? Just the same, i didn't expect him to even think of pretending knowledge where he was not well versed in the specific area under discussion. I'm in a lot more pain lately, and I'm having a harder time controlling my temper. I am dropping a lot of things, between carpal Tunnel & nerve damage to my hands. I am also tired of hearing lies from doctors. For some reason, my medication for enlarged prostrate was put on hold for 90 days, and not being able to sleep more than an hour or two at a time is starting to get to me after two months without more than four hours sleep a night. There are days that I want them to cut my damn legs off, to get rid of the constant pain. they hurt when I lay down. They hurt when i get up. They hurt when I'm sitting, and when I'm walking. I have been waiting over a year for the proper surgical support stockings, only to be told a few days ago that it's no longer available. I waited over five years for a pair of diabetic shoes. I couldn't find anything that fit, so I was wearing a pair of old shoes that should have been tossed three years ago. 10 years ago my feet were 8.5 wide. Because of Diabetes and circulation problems, they are now 11 EEEEEE (yes, 6E) and some days I have trouble even getting those on. I have 'Turned the other cheek' so many times that I no longer care. -- You can't have a sense of humor, if you have no sense. |
#88
![]()
Posted to sci.electronics.repair,rec.radio.amateur.antenna,sci.electronics.design
|
|||
|
|||
![]()
On Feb 8, 4:36*pm, Fred Bloggs
wrote: On Feb 8, 2:00*pm, amdx wrote: Those amps with power inserters, available from Radio Shack for around $40-50 as I recall, do work well, HOWEVER, I have had 2 of them burn out on me. They do run rather hot. But when they work, they usually do the trick. You power it from the TV end and the inline amp has a blocking cap so you don't put DC on the whole system. Theoreticaslly, that is what you need. I think you should put one amp every 50 feet but that may not be possible for you. Use a 15dB gain drop amp with power inserter, but that's just a guess. Would help if you actually knew signal levels like what the receiver requires for optimum reception and what the cable co sources. Putting the amplifier at source gives you a typical system noise figure of 3dB, but putting it at your end limits your NF to 10dB minimum from the start. |
#89
![]()
Posted to sci.electronics.repair,sci.electronics.design
|
|||
|
|||
![]()
On Feb 20, 8:44*pm, "Michael A. Terrell"
wrote: ...snip... * *I'm in a lot more pain lately, and I'm having a harder time controlling my temper. I am dropping a lot of things, between carpal Tunnel & nerve damage to my hands. *I am also tired of hearing lies from doctors. *For some reason, my medication for enlarged prostrate was put on hold for 90 days, and not being able to sleep more than an hour or two at a time is starting to get to me after two months without more than four hours sleep a night. *There are days that I want them to cut my damn legs off, to get rid of the constant pain. they hurt when I lay down. *They hurt when i get up. *They hurt when I'm sitting, and when I'm walking. I have been waiting over a year for the proper surgical support stockings, only to be told a few days ago that it's no longer available. *I waited over five years for a pair of diabetic shoes. *I couldn't find anything that fit, so I was wearing a pair of old shoes that should have been tossed three years ago. *10 years ago my feet were 8.5 wide. *Because of Diabetes and circulation problems, they are now 11 EEEEEE (yes, 6E) and some days I have trouble even getting those on. *I have 'Turned the other cheek' so many times that I no longer care. -- You can't have a sense of humor, if you have no sense. Does 100% oxygen environment help at all? I vaguely remember reading about successful treatment of diabetically induced poor circulation and neuropathy being treated by high pressure 100% oxygen environments. The patient sits in one of those 'bends' cure tanks foran hour a day over some sequence of time to have all their symptoms start mitigating. Downside [again from memory] was the dnagerous 100% oxygen higher pressure atmosphere required extreme care to administer, and not many people have that experience. If all the people that have followed your replies/postings over the years and have gained respect for you/your comments, could take on as burden 1/1000th of your pain, you'd be pain free today. Regards, |
#90
![]()
Posted to sci.electronics.repair,rec.radio.amateur.antenna,sci.electronics.design
|
|||
|
|||
![]() AI4QJ wrote: On Feb 8, 4:36 pm, Fred Bloggs wrote: On Feb 8, 2:00 pm, amdx wrote: Those amps with power inserters, available from Radio Shack for around $40-50 as I recall, do work well, HOWEVER, I have had 2 of them burn out on me. They do run rather hot. But when they work, they usually do the trick. You power it from the TV end and the inline amp has a blocking cap so you don't put DC on the whole system. Theoreticaslly, that is what you need. I think you should put one amp every 50 feet but that may not be possible for you. What kind of coax has 10 dB loss per 50 feet, and at what frequency? Those RS amps have no equalization, so the low channels would overlaod the front end, and the high channels would still be snowy if you need more than one or two.. -- You can't have a sense of humor, if you have no sense. |
#91
![]()
Posted to sci.electronics.repair,sci.electronics.design
|
|||
|
|||
![]() Robert Macy wrote: I vaguely remember reading about successful treatment of diabetically induced poor circulation and neuropathy being treated by high pressure 100% oxygen environments. The patient sits in one of those 'bends' cure tanks foran hour a day over some sequence of time to have all their symptoms start mitigating. Downside [again from memory] was the dnagerous 100% oxygen higher pressure atmosphere required extreme care to administer, and not many people have that experience. The only hyperbaric chamber in this area was used for race horses. It recently exploded, killing the horse and one of the Veterinary staff. http://www.ocala.com/article/2012021...cles/120219990 It's not available at the VA clinic I use, and the VA hospital is an hour away. They do have X-ray, MRI, Ultrasound & Cat scan along with two operating rooms for minor surgery but some things are too hard to have justified for the VA to purchase for use outside a full scale hospital. I've seen hospitals that were smaller than this clinic. It has 100 exam rooms. ![]() If all the people that have followed your replies/postings over the years and have gained respect for you/your comments, could take on as burden 1/1000th of your pain, you'd be pain free today. Thank you. ![]() -- You can't have a sense of humor, if you have no sense. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Increasing strength of steel through rolling | Metalworking | |||
Measuring cable signal strength with tuner and software? | Electronics Repair | |||
Test cable TV input signal strength? | Electronics Repair | |||
Measuring Cable signal strength | UK diy | |||
Cable TV Splitter Signal Strength | Home Repair |