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#51
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Belden has been making cables for decades.
Numerous wire manufacturers have been making cable for decades. Many people know their name and their reputation, comes about because of all those decades.... Nah. It's just marketing. That is their their biggest advantage. Marketing advantage, yes. Monster, on the other hand, is, as you wrote, hype. They have nothing on which to base their claims, yet, because of marketing, they have a rather large marketshare... Actually, Monster has a miniscule portion of the wire and cable market. They do have a large portion of a niche -- premade audio and video connectors. However, Monster is not the recommended alternative. There are lots of others, most of whom make excellent cable and few of whom charge Belden's prices. -- Regards, Robert L Bass ============================= Bass Home Electronics 941-866-1100 4883 Fallcrest Circle Sarasota · Florida · 34233 http://www.bassburglaralarms.com ============================= |
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#52
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As to how well the foil and braid works; I run the cable through conduit with the cables for my ham station. They will be running as much as 1500 watts 1.8 through 50 MHz, a couple hundred watts on 144 MHz and up to 50 watts on the 440 MHz band. I have two cables that run to remote preamps on UHF antennas at roughly 90 feet and two that run to the satellite dish at roughly 15 feet. There is no interaction of leakage between systems. That's just bad practice. Is that measured, or just observed? I did a less severe case of this, CATV cable (just the usual stuff from Radio Shack) routed thru the 2nd floor/ 1st floor ceiling space between two rafters along with my ham radio HF antenna coax (using thick-net Eithernet, that's just fancy RG8 with multiple shields, selected used coax without vampire tap holes) for about 10 feet. No problems observed. Of course it's better to have more separation than just a few inches, but I didn't have much choice here. |
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#53
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On Tue, 02 Jan 2007 06:40:42 GMT, lnh wrote:
In article , Roger wrote: On Fri, 29 Dec 2006 16:49:59 -0500, "Robert L Bass" wrote: Belden RG-6 is what you want... *Any* RG6 Quad Shielded cable will do fine. Belden, like Monster, has marketed their name very well. Wrong. Belden tests their cables. Monster is hype. With today's cables using a 100% foil shield, plus a braid there is little to gained by more layers of braid. Just stick with a name brand. Wrong. Here in Houston if you dont use Quad shield you WILL see the leakage How can you get better than 100% shielding? The only time *heavier* shielding would be of help is when there is *substantial* current flowing in the shield. OTOH if there is substantial current flowing in the receiving antenna shield something else is seriously wrong. I use both Greenlee and the Snap n Seal connectors. They cost a bit more, but are both mechanically sound and water proof. The old hex crimp are easy to pull apart. One of these can hold my weight on the cable and in work clothes I go over 180#. Well, my hex crimps will hang a TV, so they are fine. I seen enough bad Snap and Seal connectors that I automatically cut them off and reterminate. That certainly has not been my experience. As to how well the foil and braid works; I run the cable through conduit with the cables for my ham station. They will be running as much as 1500 watts 1.8 through 50 MHz, a couple hundred watts on 144 MHz and up to 50 watts on the 440 MHz band. I have two cables that run to remote preamps on UHF antennas at roughly 90 feet and two that run to the satellite dish at roughly 15 feet. There is no interaction of leakage between systems. That's just bad practice. Is that measured, or just observed? In reverse order: Part measured with an HP spectrum analyzer, observing measured data rates, and listening with very sensitive receivers. In addition I've seen no observable interference on the TV or heard any on the radio during checks. As to practice: They are all signal leads (with the exception of the rotator and remote antenna switch control leads and both are low voltage) and are according to code. All shields are grounded at the base of the tower and they are grounded to the tower at the top, or where the cable starts down the tower in the case of the TV, Dish, and side mounted antennas. Those shields are again grounded at a bulkhead where the cables enter the house. Also at that point are a number of Polyphasers So to recap, the coax shields are grounded at the top of the tower, bottom of the tower, and where they enter the house. All leads are the same length from the tower to the house which minimizes the likelihood of a voltage build up between them during a lightning strike. One additional note: All of the radio station coax is 100% foil shield plus braid as well. All runs are either Times Wire LMR 400 or LMR 600 This is the antenna setup. http://www.rogerhalstead.com/ham_files/Tower29.htm The TV antennas do not show in this photo, but are about where you see the plate in the tower below my feet. That is shown in the following photo. The bottom antenna at 100 feet runs about 15,000 watts effective radiated power on 14, 21, and 28 MHz. Those bands have harmonics in the low and high VHF TV channels. The long antenna above that one at 115 feet is for 50 through 54 MHZ which is directly adjacent to channel 2 with the second harmonic in the 100 to 108 MHz range. At the top, which is 130 feet are two sets of antennas. The longer, outside pair run 144 to 148 MHz which is between the low and high band VHF TV channels. The shorter pair inside those runs on the 440 MHz band. The flexible pig-tails to all these antennas have their shields grounded about 8 to 10 inches below the top of the tower. http://www.rogerhalstead.com/ham_files/Tower30.htm My two TV antennas can be seen under the large ham antenna in this shot. (The one to the NW stands out, you have to really look to see the one pointed South) Both have remote preamps within about 2 feet of the antennas. These antennas, with 20 db preamps are in the near field of all of the ham antennas. This does necessitate filtering the 144 to 148 MHz range as those signals can saturate the preamps when the antennas are pointed in the same direction as TV antenna pointing to the left. The white vertical that is side mounted on the tower (South side) runs both the 144 and 440 MHz bands. That antenna runs about 6 db gain or an effective radiated power on the 144 MHz band of about 200 watts. The top of said antenna is about 20 feet below the TV antennas. Another vertical like the one shown is going to be mounted, upside down directly under the one in the photo. They will be end to end with the second one being used for data and a link through the Internet to other ham gateways. The satellite dish does not show in either photo, but is on the same side of the tower as the white vertical and about level with the roof line. I'll eventually get this photo updated. Behind the black C-band dish is a smaller tower with a 7 through 50 MHz vertical on the West end of the shop. There is a crossed, folded dipole (which doesn't show) right at the base of the vertical for the HD TV tuner in the shop computer. http://www.rogerhalstead.com/ham_files/boat6.htm This station, computer, and amplifier have been completely reorganized since the photo was shot. All of the cables with the exception of the CAT5e run through the conduit shown. The CAT5e runs through the wall behind the equipment at floor level and then underground through conduit. The old antique station has been rebuilt with the exception of the transmitter. It is capable of running the legal power limit. There is a much smaller transceiver that drives an old Henry 2K4 amp (not shown) that I normally use. Although the station sounds elaborate, most of the equipment was purchased used (some like the 2K4 had to be rebuilt to work) and I did all of the tower work myself. There is a substantial buried ground system that has 32 or 33 (lost count) ground rods CadWelded(TM) to the cables tying everything together into what is called a single point ground system or as near so as possible. .. In addition I run a CAT5e cable with a gigabit network between 5 and 10 feet from and parallel to those cables That's not good practice, either. It meets code and works well. Besides to get that 130 foot run from the house to the shop leaves little in the way of alternatives. My only real concern for the Gigabit network is lightning as the tower has taken an average of 3 visually confirmed direct hits a year since it was installed. It took five hits this past summer I'd go wireless but it's just too slow for the amount of traffic I put on the network. I was operating this computer when the last strike occurred (Wireless keyboard and mouse). All 4 computers on the network were up and running and I had a large file transfer going between the computer to my right and the one in the shop. When the lightning hit the lights blinked, the UPSs squealed, the network went down, right back up, and continued the file transfer. BTW with that many visually confirmed hits I wonder how many times it actually gets hit. The point behind all of his is: Proper termination and grounding along with good coax allow this system to work well in an environment far more severe/hostile than most will ever experience. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
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#54
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On Tue, 02 Jan 2007 08:42:30 -0700, Ed Nielsen
wrote: snip multiples of his frequency (harmonics). The first harmonic of the CB band is 54MHz, right in broadcast TV channel 2. Roger could transmit on that very same frequency and nobody would ever know it. Thanks for the boost and fortunately channel 2 is not used around here. The problem with operating on the 50 to 54 MHz band, which I do, is TV sets are poorly shielded and the front ends are highly susceptible to overload. Hence 50 to 54 is not heavily used in channel 2 fringe areas:-)) Also, because of his grounding system (much better than a 4' copper rod stuck in the ground), anything that hops onto any of his shields goes right to earth before it can go anywhere else. As I said in another post, my cables (receiving and transmitting) are grounded at the top of the tower, the base of the tower, and where they enter the house. The ground system consists of either 32 or 33 eight foot ground rods, CadWelded (TM) to over 600 feet of cable that ties the whole works together. CIAO! Ed N. 73 :-)) Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
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#55
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Roger wrote in
: Top posted for brevity You must be the god of w_tom !!!! (Some of you may know.) It meets code and works well. Besides to get that 130 foot run from the house to the shop leaves little in the way of alternatives. My only real concern for the Gigabit network is lightning as the tower has taken an average of 3 visually confirmed direct hits a year since it was installed. It took five hits this past summer I'd go wireless but it's just too slow for the amount of traffic I put on the network. I was operating this computer when the last strike occurred (Wireless keyboard and mouse). All 4 computers on the network were up and running and I had a large file transfer going between the computer to my right and the one in the shop. When the lightning hit the lights blinked, the UPSs squealed, the network went down, right back up, and continued the file transfer. BTW with that many visually confirmed hits I wonder how many times it actually gets hit. The point behind all of his is: Proper termination and grounding along with good coax allow this system to work well in an environment far more severe/hostile than most will ever experience. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
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#56
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On Wed, 3 Jan 2007 01:02:40 +0100 (CET), DanS
wrote: Roger wrote in : Top posted for brevity You must be the god of w_tom !!!! (Some of you may know.) Eh?? Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
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#57
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Don't get w_tom started!!!
CIAO! Ed N. DanS wrote: Roger wrote in : Top posted for brevity You must be the god of w_tom !!!! (Some of you may know.) It meets code and works well. Besides to get that 130 foot run from the house to the shop leaves little in the way of alternatives. My only real concern for the Gigabit network is lightning as the tower has taken an average of 3 visually confirmed direct hits a year since it was installed. It took five hits this past summer I'd go wireless but it's just too slow for the amount of traffic I put on the network. I was operating this computer when the last strike occurred (Wireless keyboard and mouse). All 4 computers on the network were up and running and I had a large file transfer going between the computer to my right and the one in the shop. When the lightning hit the lights blinked, the UPSs squealed, the network went down, right back up, and continued the file transfer. BTW with that many visually confirmed hits I wonder how many times it actually gets hit. The point behind all of his is: Proper termination and grounding along with good coax allow this system to work well in an environment far more severe/hostile than most will ever experience. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com |
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#58
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Don't get me wrong -- I'm not a big Belden fan. Largely for the reason
you touched on in your last sentence. They want too much for their product which, according to spec sheets on cables I deal with the most, is no better than other major manufacturers. In some cases, worse. Their standard RG 6 compared with Genesis, for example; At the low end, Genesis loses more than Belden. At about 70MHz, they even out, and above that Genesis has Belden beat. However, the capacitance is greater and the VP is lower. CIAO! Ed N. Robert L Bass wrote: Belden has been making cables for decades. Numerous wire manufacturers have been making cable for decades. Many people know their name and their reputation, comes about because of all those decades.... Nah. It's just marketing. That is their their biggest advantage. Marketing advantage, yes. Monster, on the other hand, is, as you wrote, hype. They have nothing on which to base their claims, yet, because of marketing, they have a rather large marketshare... Actually, Monster has a miniscule portion of the wire and cable market. They do have a large portion of a niche -- premade audio and video connectors. However, Monster is not the recommended alternative. There are lots of others, most of whom make excellent cable and few of whom charge Belden's prices. |
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#59
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In article ,
Lewis Gardner wrote: lnh wrote: Wrong. Here in Houston if you dont use Quad shield you WILL see the leakage Is there something special about Houston? I doubt it. Exactly. Nothing special, but experience here shows quad is better. Even the incredibly cheap cable company was forced to use it Quad shield is a waste of time and money over good quality foil and braid cables like Belden duofoil. Your opinion. And that would be an expensive mistake here. Just ask the electrical contractors who used the wrong cable. And do a little research about cable companies that are fined for leakage by the FCC. I use both Greenlee and the Snap n Seal connectors. They cost a bit more, but are both mechanically sound and water proof. The old hex crimp are easy to pull apart. One of these can hold my weight on the cable and in work clothes I go over 180#. Well, my hex crimps will hang a TV, so they are fine. I seen enough bad Snap and Seal connectors that I automatically cut them off and reterminate. My experience over thousands of F connectors is the exact opposite. Please post a link to a bad SNS connector. I have yet to see one when installed to specification. At my the shop we have a wall of shame, and it has both types. My point is neither is perfect, and both can be badly installed by dweebs. Since the new rage is snap n seal connectors installed by the untrained, they are usually defective. When you do this for a living, you learn what will save time. And snap and seals are not inherently water proof. As to how well the foil and braid works; I run the cable through conduit with the cables for my ham station. They will be running as much as 1500 watts 1.8 through 50 MHz, a couple hundred watts on 144 MHz and up to 50 watts on the 440 MHz band. I have two cables that run to remote preamps on UHF antennas at roughly 90 feet and two that run to the satellite dish at roughly 15 feet. There is no interaction of leakage between systems. That's just bad practice. Is that measured, or just observed? It isn't bad practice for his application. You obviously have not been around many ham shacks. So you recommend doing this, and everybody who reads this on the internet should follow his methods? I don't. Since he is running both TX and RX through the conduit and has some nice receivers he would be aware of signal leakage. The point is that in a much more extreme RF environment foil and braid cables work fine. Again, he is lucky, and use of those cables here (and elsewhere) WILL result in VISIBLE leakage. Roger Halstead (K8RI & ARRL life member) (N833R, S# CD-2 Worlds oldest Debonair) www.rogerhalstead.com Who to believe? I don't care who you believe. A licensed Radio Amateur with actual RF experience or some no-name that can "see" signal leakage and prefers a termination technology that is no longer used in the industry. Yeah, I've only been doing installs for 30 years, so what do I know? I know what I have been trained on and what are best practices. Lots of things will work, but that is not what I will recommend. I think I'll stick with Mr. Halstead. O.K. |
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#60
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"lnh" wrote in message ... Your opinion. And that would be an expensive mistake here. Just ask the electrical contractors who used the wrong cable. And do a little research about cable companies that are fined for leakage by the FCC. So tell us about it. Where can we find info about these fines? Leonard -------------------------------------------------------------------------------- I am using the free version of SPAMfighter for private users. It has removed 19372 spam emails to date. Paying users do not have this message in their emails. Try SPAMfighter for free now! |
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