On Tue, Mar 08, 2011 at 01:28:00PM -0000, Paul Scott wrote:
"David Cantrell" wrote in message
k...
On Sat, Feb 26, 2011 at 07:21:13AM -0800, Mizter T wrote:
I think it's simply the journalist getting in a muddle and jumping to
erroneous conclusions. I don't believe there's any 'long distance'
sensing or reading of Oyster cards going on whatsoever.
Another thread has mentioned reading them en masse and at a distance
when stations have particularly heavy traffic, such as just before
football games, with no need for passengers to put their cards anywhere
near the readers.
That was confirmed soon afterwards to be the original journalist talking
******** in his article, as pointed out in one of the threads.

Ah, fair enough. And good.

--
David Cantrell | London Perl Mongers Deputy Chief Heretic

PLEASE NOTE: This message was meant to offend everyone equally,
regardless of race, creed, sexual orientation, politics, choice
of beer, operating system, mode of transport, or their editor.

On Wed, 09 Mar 2011 12:20:48 +0000
David Cantrell wrote:
On Tue, Mar 08, 2011 at 01:28:00PM -0000, Paul Scott wrote:
"David Cantrell" wrote in message
k...
On Sat, Feb 26, 2011 at 07:21:13AM -0800, Mizter T wrote:
I think it's simply the journalist getting in a muddle and jumping to
erroneous conclusions. I don't believe there's any 'long distance'
sensing or reading of Oyster cards going on whatsoever.
Another thread has mentioned reading them en masse and at a distance
when stations have particularly heavy traffic, such as just before
football games, with no need for passengers to put their cards anywhere
near the readers.
That was confirmed soon afterwards to be the original journalist talking
******** in his article, as pointed out in one of the threads.

Ah, fair enough. And good.

Given a powerful enough directed RF signal you could certainly power up and
send signals to an Oyster card from a distance. Whether or not you'd be able
to receive its very low power replies is another matter.

B2003

wrote in message
...
On Wed, 09 Mar 2011 12:20:48 +0000
David Cantrell wrote:
On Tue, Mar 08, 2011 at 01:28:00PM -0000, Paul Scott wrote:
"David Cantrell" wrote in message
k...
On Sat, Feb 26, 2011 at 07:21:13AM -0800, Mizter T wrote:
I think it's simply the journalist getting in a muddle and jumping to
erroneous conclusions. I don't believe there's any 'long distance'
sensing or reading of Oyster cards going on whatsoever.
Another thread has mentioned reading them en masse and at a distance
when stations have particularly heavy traffic, such as just before
football games, with no need for passengers to put their cards
anywhere
near the readers.
That was confirmed soon afterwards to be the original journalist talking
******** in his article, as pointed out in one of the threads.

Ah, fair enough. And good.

Given a powerful enough directed RF signal you could certainly power up
and
send signals to an Oyster card from a distance.

Only of you wanted to fry the human holding it, at the same time

tim

On Thu, 10 Mar 2011 17:00:36 -0000
"tim...." wrote:
Given a powerful enough directed RF signal you could certainly power up
and
send signals to an Oyster card from a distance.

Only of you wanted to fry the human holding it, at the same time

Why? It shouldn't need much more power than you'd get from those shop
security gates.

B2003

In message , at 17:11:20 on Thu, 10 Mar
2011, d remarked:
Given a powerful enough directed RF signal you could certainly power up
and
send signals to an Oyster card from a distance.

Only of you wanted to fry the human holding it, at the same time

Why? It shouldn't need much more power than you'd get from those shop
security gates.

Different technology, and in any case they are only doing a "yes/no",
not trying to read lots of data off the card.
--
Roland Perry

wrote in message
...
On Thu, 10 Mar 2011 17:00:36 -0000
"tim...." wrote:
Given a powerful enough directed RF signal you could certainly power up
and
send signals to an Oyster card from a distance.

Only of you wanted to fry the human holding it, at the same time

Why? It shouldn't need much more power than you'd get from those shop
security gates.

The security tags have an internal power source.

RFID chips need to use the transmitted RF as power

In message

, at 16:51:26 on Thu, 10 Mar 2011, Matthew Dickinson
remarked:
There is an interesting research document about RF distance ticketing at

http://www.dft.gov.uk/pgr/scienceres...entsystems.pdf

The main conclusions seem to be that the obstacles would be primarily
commercial objections and passenger acceptance rather than technical issues.

Whereas I see problems reported with detecting passengers at 1m, even
with a different technology (to Oyster cards) which is more suited to
that range.
--
Roland Perry

On Thu, 10 Mar 2011 19:36:46 -0000
"tim...." wrote:
wrote in message
...
On Thu, 10 Mar 2011 17:00:36 -0000
"tim...." wrote:
Given a powerful enough directed RF signal you could certainly power up
and
send signals to an Oyster card from a distance.

Only of you wanted to fry the human holding it, at the same time

Why? It shouldn't need much more power than you'd get from those shop
security gates.

The security tags have an internal power source.

You sure about that? I've seen a few with spiral antennas but no battery as
they were flat and flexible. I'm pretty sure the RF powers them up.

B2003

In message , at 10:09:43 on Fri, 11 Mar
2011, d remarked:
Given a powerful enough directed RF signal you could certainly
power up and send signals to an Oyster card from a distance.

Only of you wanted to fry the human holding it, at the same time

Why? It shouldn't need much more power than you'd get from those shop
security gates.

The security tags have an internal power source.

You sure about that? I've seen a few with spiral antennas but no battery as
they were flat and flexible. I'm pretty sure the RF powers them up.

There are different sots of security tag, just like there are different
sorts of "RFID" tag inside transport cards, or used for things like road
tolls. Much confusion arises when people assume these are all the same
technology.
--
Roland Perry

On Fri, 11 Mar 2011 10:30:53 +0000
Roland Perry wrote:
In message , at 10:09:43 on Fri, 11 Mar
2011, d remarked:
Given a powerful enough directed RF signal you could certainly
power up and send signals to an Oyster card from a distance.

Only of you wanted to fry the human holding it, at the same time

Why? It shouldn't need much more power than you'd get from those shop
security gates.

The security tags have an internal power source.

You sure about that? I've seen a few with spiral antennas but no battery as
they were flat and flexible. I'm pretty sure the RF powers them up.

There are different sots of security tag, just like there are different
sorts of "RFID" tag inside transport cards, or used for things like road
tolls. Much confusion arises when people assume these are all the same
technology.

Well I know there are different sorts - but that doesn't mean there isn't
a type thats RF powered. In fact the latest RFID tags are designed to be
powered up from a distance of a few feet and read.

B2003