In article , J. Chisholm
scribeth thus
Kev Lawrence wrote:
"CJB" wrote in message
...
On Jun 23, 9:41 pm, "
wrote:
On 23 June, 19:45, CJB wrote:





On Jun 23, 7:05 pm, SB wrote:
Trains cancelled to Worcester. Trains cancelled to Wales and West
Country. Trains cancelled to Oxford and Bourne End and also to Henley.
All other trains subject to huge delays. Reason = 'signalling
problems' in the West Drayton area from last night = 'vandalism' in
the Iver area = Pikeys cut the signal cables to burn off the plastic
and sell the copper. SB

Is there not a way that a spare core or two of the cable could carry a nice
deterrent voltage to stop this?

(probably banned cos of elf n safety!)

Kev


A better way might be to have one core with an 'active' TDR ping.

Time Domain Reflectometry sends a pulse down a wire, and recieves a
reflection from any defect, be it conductor or insulator.

This way ('cos of speed of light..) you can tell instantly exactly here
a cable is being damaged, and signal control center could arrange for
police to arrive on site..

Err .. right.. Ever tried to get old bill to turn up with any urgency in
recent times?...

It wouldn't work just for theft, but for any location, say where water
was getting into insulators.

It wouldn't necessarily work for that either..

Think about it..

Jim Chisholm

--
Tony Sayer

On Thu, 24 Jun 2010 11:14:01 +0100 someone who may be tony sayer
wrote this:-

This way ('cos of speed of light..) you can tell instantly exactly here
a cable is being damaged, and signal control center could arrange for
police to arrive on site..

Err .. right.. Ever tried to get old bill to turn up with any urgency in
recent times?...

Telling them that there is someone with a camera seems to work well.

The other one, possibly just a rural joke, is to tell them that they
need not bother any more, as one has now shot the intruders they
didn't have anyone available to deal with.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000...#pt3-pb3-l1g54

On Jun 25, 9:46*am, David Hansen
wrote:

Telling them that there is someone with a camera seems to work well.

The other one, possibly just a rural joke, is to tell them that they
need not bother any more, as one has now shot the intruders they
didn't have anyone available to deal with.


My uncle had a break in at his electrical goods shop a few years back,
and a number of things stolen. Discovered and reported during a
Saturday night, minutes after the theft. Initially the police didn't
even want to take a report over the phone and suggested he called back
during office hours on Monday and they _might_ send someone out. He
then said, truthfully, "I think they've taken my gun". The officers
in the two cars that appeared on the scene 10 minutes later were less
than impressed to find out it was an non-operational air rifle he'd
been planning to repair in the workshop.

On Fri, 25 Jun 2010 06:24:42 -0700 (PDT), "
wrote:

On Jun 25, 9:46*am, David Hansen
wrote:

Telling them that there is someone with a camera seems to work well.

The other one, possibly just a rural joke, is to tell them that they
need not bother any more, as one has now shot the intruders they
didn't have anyone available to deal with.


My uncle had a break in at his electrical goods shop a few years back,
and a number of things stolen. Discovered and reported during a
Saturday night, minutes after the theft. Initially the police didn't
even want to take a report over the phone and suggested he called back
during office hours on Monday and they _might_ send someone out. He
then said, truthfully, "I think they've taken my gun". The officers
in the two cars that appeared on the scene 10 minutes later were less
than impressed to find out it was an non-operational air rifle he'd
been planning to repair in the workshop.

How "unimpressed" would they have been if the scrote pointed the gun
at them when they stopped him/her down the road later on ?