50M : cable thickness

[figgyburn]

hi,just noticed new billboards advertising virgins "cable thickness" compared to bt infinity's "cable thinness".pretty pathetic sexual innuendo regarding the images.very Frankie howard.Anyway does the thickness of cable make a difference as virgin are claiming as I would have thought bt would be using comparable quality cable just thinner.Just wondering.

[MutleyF]

May be frankie Howard style but it caught your eye - job done !

[Taf]

In electrical wiring, thicker cables have higher bandwidths.

[qasdfdsaq]

Originally Posted by Taf

In electrical wiring, thicker cables have higher bandwidths.

The exact opposite of the truth. Thicker cables have lower bandwidths. But they also have lower resistance and thus lower loss.

http://www.microwaves101.com/encyclopedias/coax

---------- Post added at 17:47 ---------- Previous post was at 17:44 ----------

Originally Posted by figgyburn

hi,just noticed new billboards advertising virgins "cable thickness" compared to bt infinity's "cable thinness".pretty pathetic sexual innuendo regarding the images.very Frankie howard.Anyway does the thickness of cable make a difference as virgin are claiming as I would have thought bt would be using comparable quality cable just thinner.Just wondering.

I guess they got bored of yelling "fibre optic" when people wised up to the fact their competitors had just as much if not more "fibre optic".

In respect of broadband, it's the type of cable making the difference, not the thickness. Coaxial and twisted pair are completely different types of cables.

I haven't seen the ad but I suspect it'd fail to mention VM's "thicker" cable gets shared between *cough* hundreds of *cough* users.

[Taf]

Originally Posted by qasdfdsaq

The exact opposite of the truth. Thicker cables have lower bandwidths. But they also have lower resistance and thus lower loss.

My electronics and radio telecomms training and experience tends to disbelieve that. Even aerial dipoles are made "thicker" to increase bandwidth.

[Kymmy]

Originally Posted by Taf

My electronics and radio telecomms training and experience tends to disbelieve that. Even aerial dipoles are made "thicker" to increase bandwidth.

But a dipole isn't coax, the increased spacing between centre and shielding will reduce bandwidth but will also reduce attenuation but will increase power handling.

[Ignitionnet]

As I understand it those who know always rated girth over length to be honest.

[Kymmy]

Originally Posted by Ignitionnet

As I understand it those who know always rated girth over length to be honest.

......and that is why I'm a lesbian

[Ignitionnet]

Originally Posted by Kymmy

......and that is why I'm a lesbian

Me too.

[jb66]

Im just glad they are no longer telling customers we install fibre to the house

[Kushan]

Originally Posted by Ignitionnet

Me too.

I'm a lesbian and so is my wife.

[qasdfdsaq]

Originally Posted by Taf

My electronics and radio telecomms training and experience tends to disbelieve that. Even aerial dipoles are made "thicker" to increase bandwidth.

Your electronics and radio telecoms training seems to have missed out some very basic principles then it seems, like higher order propagation modes.

http://whites.sdsmt.edu/classes/ee48...1Lecture10.pdf

Aerial dipoles are not made thicker to increase bandwidth.

---------- Post added at 10:30 ---------- Previous post was at 10:29 ----------

Originally Posted by Kymmy

But a dipole isn't coax, the increased spacing between centre and shielding will reduce bandwidth but will also reduce attenuation but will increase power handling.

Exactly this. Thicker cables will carry higher frequencies and more power longer and further as long as those frequencies don't exceed the maximum cut-off frequency (i.e. bandwidth) of the cable .

---------- Post added at 10:31 ---------- Previous post was at 10:30 ----------

Originally Posted by Ignitionnet

As I understand it those who know always rated girth over length to be honest.

Without girth, length would be impossible. But without length, the girth would be useless.

[broadbandking]

Without girth, length would be impossible. But without length, the girth would be useless.

I knew I was been misled

[Escapee]

Originally Posted by qasdfdsaq

Your electronics and radio telecoms training seems to have missed out some very basic principles then it seems, like higher order propagation modes.

http://whites.sdsmt.edu/classes/ee48...1Lecture10.pdf

Aerial dipoles are not made thicker to increase bandwidth.

---------- Post added at 10:30 ---------- Previous post was at 10:29 ----------



Exactly this. Thicker cables will carry higher frequencies and more power longer and further as long as those frequencies don't exceed the maximum cut-off frequency (i.e. bandwidth) of the cable .

---------- Post added at 10:31 ---------- Previous post was at 10:30 ----------



Without girth, length would be impossible. But without length, the girth would be useless.

Thicker elements on a dipole will provide a wider VSWR bandwidth, the technology is used with birdcage dipole elements. Thicker wire in coils for filters will have the opposite effect, having a higher Q than thinner wire produces a narrower bandwidth. Duplex filters or notch filters of the lumped variety etc are often made with microbore plumbing pipe or thick silver coated wire to provide the low losses and high Q required for a sharp cut -off in the case of a duplex filter or narrow bandwidth and low out of band losses for notch filters.

Birdcage antennas often get mistaken for the fan dipole variety, these use thinner cables of slightly different lengths to broaden the resonance.

[horseman]

Originally Posted by Escapee

Thicker elements on a dipole will provide a wider VSWR bandwidth, the technology is used with birdcage dipole elements. Thicker wire in coils for filters will have the opposite effect, having a higher Q than thinner wire produces a narrower bandwidth. Duplex filters or notch filters of the lumped variety etc are often made with microbore plumbing pipe or thick silver coated wire to provide the low losses and high Q required for a sharp cut -off in the case of a duplex filter or narrow bandwidth and low out of band losses for notch filters.

Birdcage antennas often get mistaken for the fan dipole variety, these use thinner cables of slightly different lengths to broaden the resonance.

As fascinating as "skin effect" is to whatever Yagi / Moxon / Spider / Delta / Quad etc array we discuss then I still believe the Cable thickness is inversely proportional to the posters IQ... :p
73's and 88's ...