[UK-CONTEST] BT Infinity

[David Ferrington, M0XDF]

I run Virgin cable (yes was NTL) at 20MB in Bracknell - I get approx 19MB during the day and up to 19.9 late at night - unlike 'copper' based BB, you get what it says on the tin.
No problems with RFI either from or caused to the modem or router and I have some bad Rf in shack on 40m @ 100w (something I need to work on)
73 de M0XDF



On 16 Aug 2011, at 16:36, David G3YYD wrote:

> Dave
> 
> Very helpful information, thank you.
> 
> Virgin or should I say NTL cabled this street years ago with fibre. If I 
> (for that read XYL) want to go faster than 2MB/sec., I will go for 
> Virgin seems to be more EMC friendly to an HF contester. If any of my 
> neighbours start using BT Infinity then I may have some EMC issues. I 
> know with current slow broadband that a number of them go to a lower 
> speed but no one has actually complained to me. I think my attitude will 
> be nothing to do with me - it is a BT problem. I just hope Infinity can 
> adapt around my transmission but if my signal overloads the modem front 
> end....
> 
> Upgrading the exchange is cheap compared to putting the fibre to a 
> replaced street cabinet with electronics. No wonder BT say Infinity is 
> available on the exchange but no mention of the street availability.
> 
> 73 David
> 
> On 16/08/2011 13:00, Dave Sergeant wrote:
>> On 16 Aug 2011 at 11:22, David G3YYD wrote:
>> 
>>> Does anyone have experience of the EMC compatibility of this product
>>> with high power contesting? Both good and bad.
>>> 
>>> With the normal BT Broadband I had to design, make and install a 1MHz
>>> cut off LPF on the line going to the router. Without it on the low bands
>>> the modem retrained to a very low download speed.
>>> 
>>> BT Infinity still uses tones on the normal phone pair coming into the
>>> house but from a roadside cabinet which is fibre fed. To get its higher
>>> (40MB/S) speed I presume the bandwidth on the line must go higher than
>>> 1MHz. Hence the question asked.
>> BT Infinity (and similar fibre products marketted by a FEW other ISPs)
>> uses fibre to your nearest cabinet, then over normal twisted pair to
>> your house as VDSL - this uses up to 12MHz. I have no information as to
>> its EMC characteristics, but imagine radiated noise will be more
>> noticeable than ADSL/ADSL2+ (up to 2MHz). Most problems with broadband
>> disconnecting from amateur transmissions are due to it getting into the
>> router, these will be no different with Infinity, but since your
>> broadband signal is likely to be stronger depending on the distance of
>> your cabinet then I would think it would be more immune.
>> 
>> Have you checked that you can actually get Infinity? Our exchange in
>> Bracknell has slipped a year and won't be upgraded till the end of this
>> year. And having your exchange upgraded does not mean you can get it,
>> as BT have been very slow in installing the actual fibre and putting in
>> cabinets.
>> 
>>> Also anyone had problems with Vigin Media "fibre" broadband?
>> Virgin cable puts the broadband on UHF channels along with the TV
>> service, so is totally immune to the sort of problems ADSL suffers.
>> Note that the 'fibre' part goes to a major distribution hub in the
>> vicinity, it is then distributed to other cabinets and eventually your
>> house over normal coax. The fibre bit may some distance away. Obviously
>> an option if your street is cabled, but of course you are then
>> restricting yourself just to Virgin broadband.
>> 
>> 73 Dave G3YMC
>> 
>> 
>> 
>> http://www.davesergeant.com
>> 
>> _______________________________________________
>> UK-Contest mailing list
>> UK-Contest at contesting.com
>> http://lists.contesting.com/mailman/listinfo/uk-contest
> _______________________________________________
> UK-Contest mailing list
> UK-Contest at contesting.com
> http://lists.contesting.com/mailman/listinfo/uk-contest