In article , Steve Terry
scribeth thus

"tony sayer" wrote in message
...
In article , Steve Terry
scribeth thus
"Rupert Moss-Eccardt" wrote in message
...
Steve Terry wrote:
"tony wrote in message
...
In , Steve Terry
scribeth thus
"Roy wrote in message
...
On 22 Sep, 11:55, wrote:
"Roy wrote in message



On 22/09/10 11:24, Recliner wrote:
snip
Trower report:
http://www.tetrawatch.net/papers/trower_report.pdf

Some really good science there eh;?....
snip

Yes it's very suspect science, but there is little doubt that unnecessarily
multiplexing at 17.6Hz could have been a completely avoidable health risk

In 2000 whist visiting Sweden i spoke to police officers about
their new GSM Pro personal radios (at the time using waterproof
Ericsson R250s) and they were very satisfied with them.
(retail price for Ericsson R250s at the time was around £100 each)
http://www.gsmarena.com/ericsson_r250s_pro-119.php

These 450 MHz versions?. With PPT I presume?..


900MHz on existing public GSM networks with high priority GSM Pro sims
With closed group PTT

Yes that doesn't seem that clever from what I hear..

And they don't want to rely on public nets either..

Also if required additional encryption can be added to each phone.

I thought that GSM was well encrypted as it was?..

Debatable

Sufficient for practical purposes..



We of course years later had to reinvent the wheel, at the cost of
billions
to the public for the benefit of private companies, and to the detriment
of the public allowing them to share an improved GSM network.

Are you suggesting that the public shared a security network?..
Tony Sayer


Why not, it works for them, and if you think about it, most UK police
personal comms has for years already been over officers personal
GSM phones on the public network, especially still in Tetra poor
signal black spot areas.

And of course mobile phones don't have any then;?..


The added advantage to Scandinavian public, is that areas where
emergency services have poor GSM signal get priority for additional
cells to strengthen the existing network, so everyone wins.

In the early days of Tetra if it wasn't for officers being able to
fall back on their GSM phones, Tetra's many black spot areas,
would have made it fail.

Come on, there are many and still are several areas where GSM is ****
poor..


Also some UK police services have been using Blackberrys over
public GSM networks for collating data.
No one has questioned any security issues about police using the
public networks

The one thing that has worried me about officers unbridled use of
GSM phones is that where their PRs calls are recorded for
evidential later use, of course their phones aren't.

Perhaps that a good thing from the bobbies POV;!..

Steve Terry

--
Tony Sayer