Which brand of HRM has encrypted trasnmission signal?

Quoted message said:

For some reason I can't find if Polar, Mia others... have encrypted
trasnmission signals from the belt to the watch.
If anyone knows it would be great?

For me at the moment I believe noe of then have encrypted signals.

gnh888

Have you thought of asking the HRM manufacturers?

--
Mike

Quoted message said:

For some reason I can't find if Polar, Mia others... have encrypted
trasnmission signals from the belt to the watch.
If anyone knows it would be great?

For me at the moment I believe noe of then have encrypted signals.

I don't think it would make any sense for any of them to have encrypted
signals. The only data transmitted is the existance of a heart beat so
unless the belt transmitted continuously (and so had a short battery
life) the precise modulation scheme and any encryption would be
irrelevant to an eavesdropper.

Tim.

--
God said, "div D = rho, div B = 0, curl E = - @B/@t, curl H = J + @D/@t,"
and there was light.

http://tjw.hn.org/ http://www.locofungus.btinternet.co.uk/

Quoted message said:

Have you thought of asking the HRM manufacturers?

It's the best way of getting facts rather than opinions/guesses :-)

Vernon

"Tim Woodall" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Quoted message said:

For some reason I can't find if Polar, Mia others... have encrypted
trasnmission signals from the belt to the watch.
If anyone knows it would be great?

For me at the moment I believe noe of then have encrypted signals.

I don't think it would make any sense for any of them to have encrypted
signals. The only data transmitted is the existance of a heart beat so
unless the belt transmitted continuously (and so had a short battery
life) the precise modulation scheme and any encryption would be
irrelevant to an eavesdropper.

Some of them have coded signals iirc - so you can have a few of them in
close proximity.

Presumably this merely means instead of sending "ping....ping...ping"
signals, it sends "1231441234...1231441234...1231441234" or something like
that.

cheers,
clive

Clive George said:

"Tim Woodall" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Quoted message said:

For some reason I can't find if Polar, Mia others... have encrypted
trasnmission signals from the belt to the watch.
If anyone knows it would be great?

For me at the moment I believe noe of then have encrypted signals.

I don't think it would make any sense for any of them to have encrypted
signals. The only data transmitted is the existance of a heart beat so
unless the belt transmitted continuously (and so had a short battery
life) the precise modulation scheme and any encryption would be
irrelevant to an eavesdropper.

Some of them have coded signals iirc - so you can have a few of them in
close proximity.

Presumably this merely means instead of sending "ping....ping...ping"
signals, it sends "1231441234...1231441234...1231441234" or something like
that.

I guess the OP wants to ensure that noone around can tell if his heart is
beating or not, hence the need for encryption. ;-)

--
Nobby

Nobody Here said:

I guess the OP wants to ensure that noone around can tell if his heart is
beating or not, hence the need for encryption. ;-)

Maybe he's worried that the transmitter might be capable of receiving a
signal from some unknown agency that would *stop* his heart? ;-)

Quoted message said:

For some reason I can't find if Polar, Mia others... have encrypted
trasnmission signals from the belt to the watch.
If anyone knows it would be great?

For me at the moment I believe noe of then have encrypted signals.

Polar do a coded transmitter, the T61, but I think the purpose is for
ensuring you don't get leakage from others in the peloton, I don't
think its like triple-DES or something - the guys in the black
helicopters are still gonna be monitoring it.

Nobody Here said:

Quoted message said:

Presumably this merely means instead of sending "ping....ping...ping"
signals, it sends "1231441234...1231441234...1231441234" or something like
that.

I guess the OP wants to ensure that noone around can tell if his heart is
beating or not, hence the need for encryption. ;-)

Dear Mr Blonk,

One of our operatives took measurements of your heart rate during
exercise whilst you attended Scroggin's Gym on 1/1/6, and it was
determined to be outside the bounds of the average punter's heart rate.
As such, you are clearly a medical abnormality and a statistical
abhorrence, and we are therefore increasing your insurance premiums by
£38.95 per month with effect from next month. Assuring you of our best
services,

Grabbit and Keep Insurance Company.

Richard said:

Nobody Here said:

Quoted message said:

Presumably this merely means instead of sending "ping....ping...ping"
signals, it sends "1231441234...1231441234...1231441234" or something
like that.

I guess the OP wants to ensure that noone around can tell if his heart is
beating or not, hence the need for encryption. ;-)

Dear Mr Blonk,

One of our operatives took measurements of your heart rate during
exercise whilst you attended Scroggin's Gym on 1/1/6, and it was
determined to be outside the bounds of the average punter's heart rate.
As such, you are clearly a medical abnormality and a statistical
abhorrence, and we are therefore increasing your insurance premiums by
£38.95 per month with effect from next month. Assuring you of our best
services,

Grabbit and Keep Insurance Company.

P.S. And you're nicked for glorifying healthiness.

--
Tony

"The best way I know of to win an argument is to start by being in the
right."
- Lord Hailsham

sothach said:

Polar do a coded transmitter, the T61, but I think the purpose is for
ensuring you don't get leakage from others in the peloton, I don't
think its like triple-DES or something - the guys in the black
helicopters are still gonna be monitoring it.

Indeed. This belt comes with the more expensive polar HRMs. It'll usually
say on the info page on any site you wnat to buy them from "coded transmitter"

That's all you need (and I think what you meant anyway)

Arthur

--
Arthur Clune

Tony Raven said:

P.S. And you're nicked for glorifying healthiness.

It should be funny but somehow it's just depressing. :-(

--
Dave...

sothach said:

Polar do a coded transmitter, the T61, but I think the purpose is for
ensuring you don't get leakage from others in the peloton

Yeah - it doesn't need to be "encrypted", but each transmitter
needs to work only with its corresponding reciever, otherwise
peletons and training runs are going to cause trouble.

BugBear

Tim Woodall said:

Quoted message said:

For some reason I can't find if Polar, Mia others... have encrypted
trasnmission signals from the belt to the watch.
If anyone knows it would be great?

For me at the moment I believe noe of then have encrypted signals.

I don't think it would make any sense for any of them to have encrypted
signals. The only data transmitted is the existance of a heart beat so
unless the belt transmitted continuously (and so had a short battery
life) the precise modulation scheme and any encryption would be
irrelevant to an eavesdropper.

Polar have a "coded" system (or at least some of the mid/high end models
do). Whether it's encrypted according to a strict definition of that
word is unclear, but what it does enable is for a specific receiver to
be able to pick up "its" transmitter in an environment where there may
be other signals (i.e. a gym, peloton, rowing boat, whatever).

In article <[email hidden]>, chris harrison

() said:

Polar have a "coded" system (or at least some of the mid/high end models
do). Whether it's encrypted according to a strict definition of that
word is unclear, but what it does enable is for a specific receiver to
be able to pick up "its" transmitter in an environment where there may
be other signals (i.e. a gym, peloton, rowing boat, whatever).

I do not know the details of the Polar system, but can say without fear
of contradiction that they are VERY good at jamming Cardiosport HRMs.

Bah!

--
Dave Larrington - <http://www.legslarry.beerdrinkers.co.uk/>
Three blind mice, see how they run. Is this /really/ the best way to
test shampoo?

Dave Larrington said:

I do not know the details of the Polar system, but can say without fear
of contradiction that they are VERY good at jamming Cardiosport HRMs.

<panto> Oh, no, they're not.</panto>

Oh, sorry, did you mean *accurate* contradiction? ;-)

R, blathering.

(cue "I'd like to have an argument, please..." sketch)

In article <[email hidden]>, Richard

() said:

Dave Larrington said:

I do not know the details of the Polar system, but can say without fear
of contradiction that they are VERY good at jamming Cardiosport HRMs.

<panto> Oh, no, they're not.</panto>

Oh, sorry, did you mean *accurate* contradiction? ;-)

R, blathering.

(cue "I'd like to have an argument, please..." sketch)

We're watching you, terrorist!

--
The Python Police

Quoted message said:

For some reason I can't find if Polar, Mia others... have encrypted
trasnmission signals from the belt to the watch.
If anyone knows it would be great?

For me at the moment I believe noe of then have encrypted signals.

Polar mid-range and high-range have coded transmitter and receivers. For
example, my Vantage NV does. Coded transmission is error-less: either it
works or it doesn't. When the unit starts recording, it looks for a coded
transmitter and - if it finds it - it uses coded protocol. If instead it
does not find one, it reverts to non-coded transmission. When the signal
gets jammed (e.g. when passing nearby Swiss electric train lines) the
unit stops recording and waits for the signal to come back. After a timeout
it reverts to non-coded. The coded/non-coded status is shown by my unit on
the screen by a little heart. When it goes in non-coded status it is not
possible to revert (in the same session) to coded: I must stop and restart
the recording.

Other features of the coded system are: less interference when in a tight
pack and (but I am not sure this is only for coded) the possibility to set
a shorter detection range.

I am not sure that coded means - for the Polar - encrypted but from the
result it looks like this may be true.

Polar coded chest straps are clearly marked as such. And are more expensive
than other brands'. And are not user-serviceable (but this is another
story).

Ciao,
--
Roberto Divia` Love at first sight is one of the greatest
Dep:PH Bat:53 Mailbox:C02110 labour-saving devices the world has ever seen
Route de Meyrin 385 ---------------------------------------------
Case Postale Phone: +41-22-767-4994
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The Python Police said:

We're watching you, terrorist!

Well, I certainly didn't expect the Python Police.

R.