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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
Hello,
I know to use f plugs wherever possible but I need a coax plug to connect at the back of the tv. I had a quick look on the CPC web site but they sell aluminium plugs, nickel plated zinc plugs, and plated brass plugs. Are they all the same or is one better than the others? Thanks, Stephen. |
#2
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
On 07/07/15 16:37, Stephen wrote:
Hello, I know to use f plugs wherever possible but I need a coax plug to connect at the back of the tv. I had a quick look on the CPC web site but they sell aluminium plugs, nickel plated zinc plugs, and plated brass plugs. Are they all the same or is one better than the others? Thanks, Stephen. In real terms, there isn't much difference. The typical Belling Lee style TV plug is pretty grim as connectors go but, as they tend to be only plugged/unplugged once in a while, it doesn't make much difference. I use whatever I have to hand, mainly aluminium as I happened to pick up a stock of them for free. You can get converters so you can use F plugs but, in all honesty, they can be pretty grim as well, if no fitted correctly. I carry some in my motorhome as some caravan sites use F sockets on the TV distribution system and the adaptors are sometimes missing. I was lucky enough to pick up some nice pre-made F leads for free which are about a metre long, which I use between the wall plates and the satellite receivers here. |
#3
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
On 07/07/2015 17:11, Brian Reay wrote:
On 07/07/15 16:37, Stephen wrote: Hello, I know to use f plugs wherever possible but I need a coax plug to connect at the back of the tv. I had a quick look on the CPC web site but they sell aluminium plugs, nickel plated zinc plugs, and plated brass plugs. Are they all the same or is one better than the others? Thanks, Stephen. In real terms, there isn't much difference. The typical Belling Lee style TV plug is pretty grim as connectors go Why do punters invariably put the cable grip on upside down? but, as they tend to be only plugged/unplugged once in a while, it doesn't make much difference. I use whatever I have to hand, mainly aluminium as I happened to pick up a stock of them for free. You can get converters so you can use F plugs but, in all honesty, they can be pretty grim as well, if no fitted correctly. I carry some in my motorhome as some caravan sites use F sockets on the TV distribution system and the adaptors are sometimes missing. I was lucky enough to pick up some nice pre-made F leads for free which are about a metre long, which I use between the wall plates and the satellite receivers here. |
#4
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
On 07/07/2015 16:37, Stephen wrote:
Hello, I know to use f plugs wherever possible but I need a coax plug to connect at the back of the tv. I had a quick look on the CPC web site but they sell aluminium plugs, nickel plated zinc plugs, and plated brass plugs. Are they all the same or is one better than the others? The plated brass plugs tend to be best IME. CPC also do some quite decent "screw on" belling lee style plugs that you fit in a similar way to an F connector. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#5
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
I think the real choice is the solder type for the central conductor or the
ones that have a screw to hold it rather than solder. Of course in practice I guess most in use are solder type but not soldered. Regards David "Brian Reay" wrote in message ... In real terms, there isn't much difference. The typical Belling Lee style TV plug is pretty grim as connectors go but, as they tend to be only plugged/unplugged once in a while, it doesn't make much difference. |
#6
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
In article , David wrote:
I think the real choice is the solder type for the central conductor or the ones that have a screw to hold it rather than solder. Of course in practice I guess most in use are solder type but not soldered. Regards David Indeed, a slight kink in the centre wire and it just makes a rubbing contact with the plug's pin. "Brian Reay" wrote in message ... In real terms, there isn't much difference. The typical Belling Lee style TV plug is pretty grim as connectors go but, as they tend to be only plugged/unplugged once in a while, it doesn't make much difference. -- Please note new email address: |
#7
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
On Tue, 07 Jul 2015 18:45:43 +0100, John Rumm wrote:
On 07/07/2015 16:37, Stephen wrote: Hello, I know to use f plugs wherever possible but I need a coax plug to connect at the back of the tv. I had a quick look on the CPC web site but they sell aluminium plugs, nickel plated zinc plugs, and plated brass plugs. Are they all the same or is one better than the others? The plated brass plugs tend to be best IME. CPC also do some quite decent "screw on" belling lee style plugs that you fit in a similar way to an F connector. Agreed - I bought some plugs from Wilko, as I was desperate for them, and they were useless as the aluminium had no 'spring'. Got som brass ones asap and they've been OK for several years. -- Peter. The gods will stay away whilst religions hold sway |
#8
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
Try to avoid the ally ones as they can get very grotty after a while if
there is any kind of humidity about. Brian -- From the Sofa of Brian Gaff Reply address is active "Stephen" wrote in message ... Hello, I know to use f plugs wherever possible but I need a coax plug to connect at the back of the tv. I had a quick look on the CPC web site but they sell aluminium plugs, nickel plated zinc plugs, and plated brass plugs. Are they all the same or is one better than the others? Thanks, Stephen. |
#9
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tv coax plugs
On Tue, 07 Jul 2015 18:12:01 +0100, MacDonald
wrote: On 07/07/2015 17:11, Brian Reay wrote: On 07/07/15 16:37, Stephen wrote: Hello, I know to use f plugs wherever possible but I need a coax plug to connect at the back of the tv. I had a quick look on the CPC web site but they sell aluminium plugs, nickel plated zinc plugs, and plated brass plugs. Are they all the same or is one better than the others? Thanks, Stephen. In real terms, there isn't much difference. The typical Belling Lee style TV plug is pretty grim as connectors go Why do punters invariably put the cable grip on upside down? Not just punters. I corrected some in my daughters house fitted by a self-styled "AV Consultant". -- Graham. %Profound_observation% |
#10
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tv coax plugs
On 07/07/2015 18:12, MacDonald wrote:
Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? Jim |
#11
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
On Wed, 08 Jul 2015 19:50:05 +0100
Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? Jim http://satcure.co.uk/tech/tvplugs.htm -- Davey. |
#12
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tv coax plugs
On 08/07/2015 19:50, Indy Jess John wrote:
On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. We were taught how to fit them properly at college some 15 years ago as part of out very first practical exam' along with fitting 13A plugs. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? Jim The segmented end faces away from the plug tip. |
#13
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
"Davey" wrote in message
... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. |
#14
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
"MacDonald" wrote in message ... On 08/07/2015 19:50, Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. We were taught how to fit them properly at college some 15 years ago as part of out very first practical exam' along with fitting 13A plugs. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? The segmented end faces away from the plug tip. I'm amazed that isn't obvious to everyone. |
#15
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
"NY" wrote in message o.uk... "Davey" wrote in message ... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I've done it any other way. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. I was never told by anyone how to use them, in person or in instructions. |
#16
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
In article ,
Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. The BBC booklet TV Tansmiiting stations used to publish a re-drawn Belling Lee picture. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? The segmented end should grip on the braid when the connector is screwed together, Segmented end away from the central pin. |
#17
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
In article ,
NY wrote: "Davey" wrote in message ... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. |
#18
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
In message , Davey
writes On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? Jim http://satcure.co.uk/tech/tvplugs.htm Images 9 (the one with the fingers) and 10 are wrong. The braid of the coax should be splayed out radially, lightly sandwiched between the clamp and the body, trimmed to very slightly more than the diameter of the clamp - and then the 'nut' tightened up. That said, I have been known to do it the way shown - especially when I found myself making a right pig's ear of the proper way! -- Ian |
#19
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
On 08/07/15 20:18, NY wrote:
I've never heard of soldering the central core to the centre pin of the plug. I've always done them that way if I had a soldering ioron handy -- New Socialism consists essentially in being seen to have your heart in the right place whilst your head is in the clouds and your hand is in someone else's pocket. |
#20
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
In message , Charles Hope
writes I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. I've only kinked the inner when I didn't have a soldering iron at hand - and then it was a sufficiently kinky kink to require a very firm push to insert it through the pin. -- Ian |
#21
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tv coax plugs
"Rod Speed" wrote in message ... "NY" wrote in message o.uk... "Davey" wrote in message ... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I've done it any other way. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. I was never told by anyone how to use them, in person or in instructions. Understandable as you live in Australia, are Australian and like all Australians are as thick and as much use as pig ****. |
#22
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tv coax plugs
"Ian Jackson" wrote in message
... In message , Charles Hope writes I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. I've only kinked the inner when I didn't have a soldering iron at hand - and then it was a sufficiently kinky kink to require a very firm push to insert it through the pin. I've rarely been able to get the inner straight enough that it didn't. |
#23
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tv coax plugs
On Wed, 08 Jul 2015 21:14:07 +0100, Charles Hope
wrote: In article , Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. The BBC booklet TV Tansmiiting stations used to publish a re-drawn Belling Lee picture. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? The segmented end should grip on the braid when the connector is screwed together, Segmented end away from the central pin. No it shouldn't. The segmented end grips the outer insulation. The braid goes right through the segmented piece and out of the plain end, where it is splayed out like a chimney sweep's brush, then trimmed into a circle. When the nut is tightened, it forces the segmented piece to grip the insulation, at the same time pressing the plain end to grip the sweep's brush between it and the plastic that holds the centre pin. -- Dave W |
#24
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
On 08/07/2015 20:18, NY wrote:
I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. In my youth I seem to remember high quality plugs with a small grub screw on the plastic spacer for the purpose - haven't seen one like that for a good while however. -- CB |
#25
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tv coax plugs
In article ,
CB wrote: On 08/07/2015 20:18, NY wrote: I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. In my youth I seem to remember high quality plugs with a small grub screw on the plastic spacer for the purpose - haven't seen one like that for a good while however. any right angle one that I've seen uses a grub screw. |
#26
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tv coax plugs
CB wrote:
In my youth I seem to remember high quality plugs with a small grub screw on the plastic spacer for the purpose - haven't seen one like that for a good while however. The metal Maplin ones have a grub screw http://www.maplin.co.uk/p/high-quali...oax-plug-fd85g According to the reviews, even the cheapo plastic ones have a screw, but it doesn't work too well ... http://www.maplin.co.uk/p/plastic-coax-plug-yw08j |
#27
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
In message , Ian Jackson
writes In message , Davey writes On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? Jim http://satcure.co.uk/tech/tvplugs.htm Images 9 (the one with the fingers) and 10 are wrong. The braid of the coax should be splayed out radially, lightly sandwiched between the clamp and the body, trimmed to very slightly more than the diameter of the clamp - and then the 'nut' tightened up. That said, I have been known to do it the way shown - especially when I found myself making a right pig's ear of the proper way! Just to follow up - this is the correct way to deal with the braid - and centre pin. http://www.megalithia.com/elect/bellinglee/ -- Ian |
#28
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
On Wed, 08 Jul 2015 21:15:32 +0100, Charles Hope
wrote: In article , NY wrote: "Davey" wrote in message ... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. It was a lot more important to solder the inner when TV was delivered via VHF especially Band I Also not soldering the inner of a B.L plug that is carrying DC to a masthead amp is asking for trouble. -- Graham. %Profound_observation% |
#29
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tv coax plugs
In article , Graham.
wrote: On Wed, 08 Jul 2015 21:15:32 +0100, Charles Hope wrote: In article , NY wrote: "Davey" wrote in message ... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. It was a lot more important to solder the inner when TV was delivered via VHF especially Band I I'd expect far greater losses from an un-soldered joint at Band V Also not soldering the inner of a B.L plug that is carrying DC to a masthead amp is asking for trouble. |
#30
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tv coax plugs
On Thu, 09 Jul 2015 19:26:35 +0100, Charles Hope
wrote: In article , Graham. wrote: On Wed, 08 Jul 2015 21:15:32 +0100, Charles Hope wrote: In article , NY wrote: "Davey" wrote in message ... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. It was a lot more important to solder the inner when TV was delivered via VHF especially Band I I'd expect far greater losses from an un-soldered joint at Band V It's a commonly held view given that feeder losses are so much greater at UHF, but it's wrong. Even if it's open circuit at DC there will still be a few picofarads of capacitance, and capacitive reactance decreases as the frequency increases. -- Graham. %Profound_observation% |
#31
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tv coax plugs
In article , Graham.
wrote: On Thu, 09 Jul 2015 19:26:35 +0100, Charles Hope wrote: In article , Graham. wrote: On Wed, 08 Jul 2015 21:15:32 +0100, Charles Hope wrote: In article , NY wrote: "Davey" wrote in message ... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. It was a lot more important to solder the inner when TV was delivered via VHF especially Band I I'd expect far greater losses from an un-soldered joint at Band V It's a commonly held view given that feeder losses are so much greater at UHF, but it's wrong. How about reading the manufacturers tables? eg: URM43. 100MHz loss 13dB/100m 600MHz 34 URM67 50 MHz 4.5 800 MHz 18 |
#32
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tv coax plugs
On Thu, 09 Jul 2015 21:32:55 +0100, Charles Hope
wrote: In article , Graham. wrote: On Thu, 09 Jul 2015 19:26:35 +0100, Charles Hope wrote: In article , Graham. wrote: On Wed, 08 Jul 2015 21:15:32 +0100, Charles Hope wrote: In article , NY wrote: "Davey" wrote in message ... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. It was a lot more important to solder the inner when TV was delivered via VHF especially Band I I'd expect far greater losses from an un-soldered joint at Band V It's a commonly held view given that feeder losses are so much greater at UHF, but it's wrong. How about reading the manufacturers tables? eg: URM43. 100MHz loss 13dB/100m 600MHz 34 URM67 50 MHz 4.5 800 MHz 18 I'll repeat it and highlight the important word. It's a commonly held view **given** that feeder losses are so much greater at UHF, but it's wrong. The view that the same amount capacitive coupling attenuates the signal more at UHF than at VHF is wrong, Feeder losses increase with frequency, that's a given! -- Graham. %Profound_observation% |
#33
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tv coax plugs
"Charles Hope" wrote in message ... In article , Graham. wrote: On Thu, 09 Jul 2015 19:26:35 +0100, Charles Hope wrote: In article , Graham. wrote: On Wed, 08 Jul 2015 21:15:32 +0100, Charles Hope wrote: In article , NY wrote: "Davey" wrote in message ... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. It was a lot more important to solder the inner when TV was delivered via VHF especially Band I I'd expect far greater losses from an un-soldered joint at Band V It's a commonly held view given that feeder losses are so much greater at UHF, but it's wrong. How about reading the manufacturers tables? eg: URM43. 100MHz loss 13dB/100m 600MHz 34 URM67 50 MHz 4.5 800 MHz 18 That isn't the loss in an unsoldered center pin connector. |
#34
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tv coax plugs
On 07/07/2015 18:45, John Rumm wrote:
The plated brass plugs tend to be best IME. CPC also do some quite decent "screw on" belling lee style plugs that you fit in a similar way to an F connector. The are vastly better connectors than the old Belling-Lee around in the TV/AV world these days. For DIY use the Cabelcon 'self-install' products (no crimp or axial compression tools required) are really good. Here's a selection from Ebay http://www.ebay.co.uk/sch/i.html?_od...stall&_sacat=0 There's also these neat right-angle versions http://www.cabelcon.dk/download/IEC90_SI_120912.pdf -- Andy |
#35
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
On 08/07/2015 19:58, Davey wrote:
On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? Jim http://satcure.co.uk/tech/tvplugs.htm Thanks. I have been doing it right. Jim |
#36
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tv coax plugs
I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. It was a lot more important to solder the inner when TV was delivered via VHF especially Band I I'd expect far greater losses from an un-soldered joint at Band V It's a commonly held view given that feeder losses are so much greater at UHF, but it's wrong. How about reading the manufacturers tables? eg: URM43. 100MHz loss 13dB/100m 600MHz 34 URM67 50 MHz 4.5 800 MHz 18 He's right on that one!. And thats taking decent cables, not the ones sold for TV use that have sod all copper in them. I believe the noble member for Rotherham Lord W Wright did quite a bit of work on that a while ago?.. -- Tony Sayer |
#38
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tv coax plugs
In message ,
Terry Casey writes In article , says... In message , Ian Jackson writes In message , Davey writes On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? Jim http://satcure.co.uk/tech/tvplugs.htm Images 9 (the one with the fingers) and 10 are wrong. The braid of the coax should be splayed out radially, lightly sandwiched between the clamp and the body, trimmed to very slightly more than the diameter of the clamp - and then the 'nut' tightened up. That said, I have been known to do it the way shown - especially when I found myself making a right pig's ear of the proper way! Just to follow up - this is the correct way to deal with the braid - and centre pin. http://www.megalithia.com/elect/bellinglee/ If the cable has a generous quantity of braid (as it should have) this wont work because there is not room inside the body to accept both clamp and braid. The correct way - based on pictures provided by Belling & Lee 50 years ago but recreated from memory - is as shown he http://i260.photobucket.com/albums/i...oto/tv/BL1.png http://i260.photobucket.com/albums/i...oto/tv/BL2.png http://i260.photobucket.com/albums/i...oto/tv/BL3.png It will probably be found easier to solder the centre pin first - this should make it easier to trim the braid with flush bladed cutters. The ring of braid compressed between the clamp and the insulator when the plug is assembled provides a true coaxial termination. Those drawings show essentially what I described. The text says "Now do a haircutting action - trim the braid as close to the aluminium part as possible and smooth what's left back along the cable". I take that as meaning "Try to trim off most of the splayed braiding - but it's OK to leave a few longer strands on". -- Ian |
#39
Posted to uk.tech.digital-tv,uk.d-i-y
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tv coax plugs
In article ,
says... In message , Terry Casey writes In article , says... In message , Ian Jackson writes In message , Davey writes On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? Jim http://satcure.co.uk/tech/tvplugs.htm Images 9 (the one with the fingers) and 10 are wrong. The braid of the coax should be splayed out radially, lightly sandwiched between the clamp and the body, trimmed to very slightly more than the diameter of the clamp - and then the 'nut' tightened up. That said, I have been known to do it the way shown - especially when I found myself making a right pig's ear of the proper way! Just to follow up - this is the correct way to deal with the braid - and centre pin. http://www.megalithia.com/elect/bellinglee/ If the cable has a generous quantity of braid (as it should have) this wont work because there is not room inside the body to accept both clamp and braid. The correct way - based on pictures provided by Belling & Lee 50 years ago but recreated from memory - is as shown he http://i260.photobucket.com/albums/i...oto/tv/BL1.png http://i260.photobucket.com/albums/i...oto/tv/BL2.png http://i260.photobucket.com/albums/i...oto/tv/BL3.png It will probably be found easier to solder the centre pin first - this should make it easier to trim the braid with flush bladed cutters. The ring of braid compressed between the clamp and the insulator when the plug is assembled provides a true coaxial termination. Those drawings show essentially what I described. The text says "Now do a haircutting action - trim the braid as close to the aluminium part as possible and smooth what's left back along the cable". I take that as meaning "Try to trim off most of the splayed braiding - but it's OK to leave a few longer strands on". The distinction I was trying to make is that, using cable with significantly more braid than in the pictures you previously linked to, it will be impossible to get the clamp into the body BEFORE it is trimmed, thus the need to trim it as closely as possible to the clamp/insulator assembly. If you gave me a piece of coax with as skimpy a braid as that in those photographs, I throw the cable away and start again with something decent! -- Terry |
#40
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tv coax plugs
On 09/07/2015 21:32, Charles Hope wrote:
In article , Graham. wrote: On Thu, 09 Jul 2015 19:26:35 +0100, Charles Hope wrote: In article , Graham. wrote: On Wed, 08 Jul 2015 21:15:32 +0100, Charles Hope wrote: In article , NY wrote: "Davey" wrote in message ... On Wed, 08 Jul 2015 19:50:05 +0100 Indy Jess John wrote: On 07/07/2015 18:12, MacDonald wrote: Why do punters invariably put the cable grip on upside down? Because there are no instructions with it when you buy one? Perhaps I am one of those who fits them upside down, because I have never seen anything resembling an installation diagram or fitting instructions. There is a continuous end and a segmented end. I have always fitted the segmented end farthest away from the connection end. Am I right or wrong? I can understand the mistake of fitting the cable grip upside down, given that the cylindrical metal shroud of the plug often has a conical indentation at the cable end into which the conical end of an upside-down cable clamp fits nicely. I've even seen plugs with the clamp already inserted upside down so a punter would naturally assume that when he has removed it to fit onto the cable it should remain in that orientation. I've never heard of soldering the central core to the centre pin of the plug. I was told to use fine-nosed pliers to crimp a slight kink in the core so it will make good contact with the inside of the centre pin. oh dear. It was a lot more important to solder the inner when TV was delivered via VHF especially Band I I'd expect far greater losses from an un-soldered joint at Band V It's a commonly held view given that feeder losses are so much greater at UHF, but it's wrong. How about reading the manufacturers tables? eg: URM43. 100MHz loss 13dB/100m 600MHz 34 URM67 50 MHz 4.5 800 MHz 18 Note sure if that adds anything... he just said that the feeder losses are higher at UHF, but that does not necessarily mean that termination losses are as well. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
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