etag transponders

Discussion in 'Hobby Electronics' started by F Murtz, Jan 19, 2009.

  1. F Murtz

    F Murtz Guest

    are etags "active" if so the batteries must be good to last so long in
    that environment and temperatures on glass inside windscreens.
    if they are passive where do they get the beep
     
    F Murtz, Jan 19, 2009
    #1
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  2. F Murtz

    dmm Guest

    On Mon, 19 Jan 2009 22:23:28 +1100, F Murtz <> wrote:

    >are etags "active" if so the batteries must be good to last so long in
    >that environment and temperatures on glass inside windscreens.
    >if they are passive where do they get the beep


    Dunno about other etags, but the wife's etag has a Saft 3.6V lithium battery.
     
    dmm, Jan 19, 2009
    #2
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  3. F Murtz

    Bob Parker Guest

    On 19/01/2009 22:51 dmm wrote:
    > On Mon, 19 Jan 2009 22:23:28 +1100, F Murtz <> wrote:
    >
    >> are etags "active" if so the batteries must be good to last so long in
    >> that environment and temperatures on glass inside windscreens.
    >> if they are passive where do they get the beep

    >
    > Dunno about other etags, but the wife's etag has a Saft 3.6V lithium battery.
    >


    The data sheet for the ones supplied by the NSW RTA is at
    http://www.q-free.com/images/stories/Files/Products/Factsheets/MD5888.pdf
     
    Bob Parker, Jan 19, 2009
    #3
  4. F Murtz

    F Murtz Guest

    Bob Parker wrote:
    > On 19/01/2009 22:51 dmm wrote:
    >> On Mon, 19 Jan 2009 22:23:28 +1100, F Murtz <> wrote:
    >>
    >>> are etags "active" if so the batteries must be good to last so long
    >>> in that environment and temperatures on glass inside windscreens.
    >>> if they are passive where do they get the beep

    >>
    >> Dunno about other etags, but the wife's etag has a Saft 3.6V lithium
    >> battery.
    >>

    >
    > The data sheet for the ones supplied by the NSW RTA is at
    > http://www.q-free.com/images/stories/Files/Products/Factsheets/MD5888.pdf
    >
    >

    thanks
     
    F Murtz, Jan 19, 2009
    #4
  5. F Murtz

    Mr.T Guest

    "F Murtz" <> wrote in message
    news:497462ad$...
    > are etags "active" if so the batteries must be good to last so long in
    > that environment and temperatures on glass inside windscreens.
    > if they are passive where do they get the beep


    The tolling companies replace the etags when the batteries go flat.

    MrT.
     
    Mr.T, Jan 19, 2009
    #5
  6. F Murtz

    kreed Guest

    On Jan 19, 9:51 pm, dmm <> wrote:
    > On Mon, 19 Jan 2009 22:23:28 +1100, F Murtz <> wrote:
    > >are etags "active" if so the batteries must be good to last so long in
    > >that environment and temperatures on glass inside windscreens.
    > >if they are passive where do they get the beep

    >
    > Dunno about other etags, but the wife's etag has a Saft 3.6V lithium battery.



    from the pic supplied from bobs link, those batteries (in RAM backup
    applications) I have found
    will last 20 years (measured full terminal voltage when replaced).
    Depending on the transmission
    power, and how often, as well as the sounder and how often its
    activated, a long life is quite viable.

    I didnt think any battery would cope well with the temperatures
    involved, especially when placed at the highest (hottest) point in the
    car (upper windscreen)
     
    kreed, Jan 20, 2009
    #6
  7. On Jan 20, 10:40 am, kreed <> wrote:
    > On Jan 19, 9:51 pm, dmm <> wrote:
    >
    > > On Mon, 19 Jan 2009 22:23:28 +1100, F Murtz <> wrote:
    > > >are etags "active" if so the batteries must be good to last so long in
    > > >that environment and temperatures on glass inside windscreens.
    > > >if they are passive where do they get the beep

    >
    > > Dunno about other etags, but the wife's etag has a Saft 3.6V lithium battery.

    >
    > from the pic supplied from bobs link, those batteries (in RAM backup
    > applications) I have found
    > will last 20 years (measured full terminal voltage when replaced).
    > Depending on the transmission
    > power, and how often, as well as the sounder and how often its
    > activated, a long life is quite viable.
    >
    > I didnt think any battery would cope well with the temperatures
    > involved, especially when placed at the highest (hottest) point in the
    > car (upper windscreen)


    They most likely use the 120degC rated Lithium-thionyl chloride cells.
    http://www.saftbatteries.com/Technologies_Lithium_LiSOCl2_303/Default.aspx

    I've used (and thermal cycled) them in operating apps from 0degC to
    80+degC (ironically in two of the listed apps - sonarbuoys and oil
    exploration), they are remarkably durable.

    Dave.
     
    David L. Jones, Jan 20, 2009
    #7
  8. F Murtz

    Techo Guest

    I got one of the RTA tags when they first came out. The battery died after
    about five years, the RTA then replaces it for free. When you ring them,
    they can look up on their system to see ;your signal strength from when you
    have been travelling through their tolls.

    "David L. Jones" <> wrote in message
    news:...
    > On Jan 20, 10:40 am, kreed <> wrote:
    > > On Jan 19, 9:51 pm, dmm <> wrote:
    > >
    > > > On Mon, 19 Jan 2009 22:23:28 +1100, F Murtz <>

    wrote:
    > > > >are etags "active" if so the batteries must be good to last so long

    in
    > > > >that environment and temperatures on glass inside windscreens.
    > > > >if they are passive where do they get the beep

    > >
    > > > Dunno about other etags, but the wife's etag has a Saft 3.6V lithium

    battery.
    > >
    > > from the pic supplied from bobs link, those batteries (in RAM backup
    > > applications) I have found
    > > will last 20 years (measured full terminal voltage when replaced).
    > > Depending on the transmission
    > > power, and how often, as well as the sounder and how often its
    > > activated, a long life is quite viable.
    > >
    > > I didnt think any battery would cope well with the temperatures
    > > involved, especially when placed at the highest (hottest) point in the
    > > car (upper windscreen)

    >
    > They most likely use the 120degC rated Lithium-thionyl chloride cells.
    > http://www.saftbatteries.com/Technologies_Lithium_LiSOCl2_303/Default.aspx
    >
    > I've used (and thermal cycled) them in operating apps from 0degC to
    > 80+degC (ironically in two of the listed apps - sonarbuoys and oil
    > exploration), they are remarkably durable.
    >
    > Dave.
     
    Techo, Jan 20, 2009
    #8
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