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  1. #1
    Richard Ness
    Guest
    It's not the frequency, it's the digital transmission method.

    CDMA doesn't cause much, if any interference. TDMA and Nextel
    definitely do because TDMA (the time slots) pulse (iDEN is similar).

    Ever heard that "tick, tick, tick.......out of a nearby radio when a
    TDMA or Nextel TX is active?


    "Thomas M. Goethe" <[email protected]> wrote in message news:[email protected]
    > And the Nextel is in the same frequency range as most c-phones and has
    > more power.
    >
    >
    > --
    > Thomas M. Goethe
    >
    > "Lawrence Glasser" <[email protected]> wrote in message
    > news:[email protected]
    > > maryann wrote:
    > > >
    > > > There was a thread here a few months ago about cell phone use in
    > > > hospitals, with plenty of self righteous talk about the "dangers"
    > > > to the patients.
    > > >
    > > > I spent all of today in John Muir Hospital waiting for the gf to come

    > out
    > > > of surgery, and noticed that each and every hospital employee appears to
    > > > be equipped with a cell phone. Needless to say, they
    > > > seem to think they won't kill the patients that way.

    > >
    > > More than likely a Nextel-type system... More of a walkie-talkie
    > > than a cell phone.
    > >
    > > Larry

    >
    >






    See More: TDMA and iDEN do...




  2. #2
    Bill Roland
    Guest

    Re: TDMA and iDEN do...

    Yep. I often know I have an incoming call before the i90c starts ringing
    because I hear pulsing interference on the speakers nearby the phone for a
    second or two before it starts ringing.


    "Richard Ness" <[email protected]> wrote in message
    news:[email protected]
    > It's not the frequency, it's the digital transmission method.
    >
    > CDMA doesn't cause much, if any interference. TDMA and Nextel
    > definitely do because TDMA (the time slots) pulse (iDEN is similar).
    >
    > Ever heard that "tick, tick, tick.......out of a nearby radio when a
    > TDMA or Nextel TX is active?
    >
    >
    > "Thomas M. Goethe" <[email protected]> wrote in message

    news:[email protected]
    > > And the Nextel is in the same frequency range as most c-phones and

    has
    > > more power.
    > >
    > >
    > > --
    > > Thomas M. Goethe
    > >
    > > "Lawrence Glasser" <[email protected]> wrote in message
    > > news:[email protected]
    > > > maryann wrote:
    > > > >
    > > > > There was a thread here a few months ago about cell phone use in
    > > > > hospitals, with plenty of self righteous talk about the "dangers"
    > > > > to the patients.
    > > > >
    > > > > I spent all of today in John Muir Hospital waiting for the gf to

    come
    > > out
    > > > > of surgery, and noticed that each and every hospital employee

    appears to
    > > > > be equipped with a cell phone. Needless to say, they
    > > > > seem to think they won't kill the patients that way.
    > > >
    > > > More than likely a Nextel-type system... More of a walkie-talkie
    > > > than a cell phone.
    > > >
    > > > Larry

    > >
    > >

    >
    >






  3. #3
    Bill Roland
    Guest

    Re: TDMA and iDEN do...

    Yep. I often know I have an incoming call before the i90c starts ringing
    because I hear pulsing interference on the speakers nearby the phone for a
    second or two before it starts ringing.


    "Richard Ness" <[email protected]> wrote in message
    news:[email protected]
    > It's not the frequency, it's the digital transmission method.
    >
    > CDMA doesn't cause much, if any interference. TDMA and Nextel
    > definitely do because TDMA (the time slots) pulse (iDEN is similar).
    >
    > Ever heard that "tick, tick, tick.......out of a nearby radio when a
    > TDMA or Nextel TX is active?
    >
    >
    > "Thomas M. Goethe" <[email protected]> wrote in message

    news:[email protected]
    > > And the Nextel is in the same frequency range as most c-phones and

    has
    > > more power.
    > >
    > >
    > > --
    > > Thomas M. Goethe
    > >
    > > "Lawrence Glasser" <[email protected]> wrote in message
    > > news:[email protected]
    > > > maryann wrote:
    > > > >
    > > > > There was a thread here a few months ago about cell phone use in
    > > > > hospitals, with plenty of self righteous talk about the "dangers"
    > > > > to the patients.
    > > > >
    > > > > I spent all of today in John Muir Hospital waiting for the gf to

    come
    > > out
    > > > > of surgery, and noticed that each and every hospital employee

    appears to
    > > > > be equipped with a cell phone. Needless to say, they
    > > > > seem to think they won't kill the patients that way.
    > > >
    > > > More than likely a Nextel-type system... More of a walkie-talkie
    > > > than a cell phone.
    > > >
    > > > Larry

    > >
    > >

    >
    >






  4. #4
    Thomas T. Veldhouse
    Guest

    Re: TDMA and iDEN do...


    "Richard Ness" <[email protected]> wrote in message
    news:[email protected]
    > It's not the frequency, it's the digital transmission method.
    >
    > CDMA doesn't cause much, if any interference. TDMA and Nextel
    > definitely do because TDMA (the time slots) pulse (iDEN is similar).
    >
    > Ever heard that "tick, tick, tick.......out of a nearby radio when a
    > TDMA or Nextel TX is active?
    >


    GSM phones are horrible with this (at least the PCS variety). Since GSM is
    TDMA based, it does not surprise me.

    Tom Veldhouse





  5. #5
    Thomas T. Veldhouse
    Guest

    Re: TDMA and iDEN do...


    "Richard Ness" <[email protected]> wrote in message
    news:[email protected]
    > It's not the frequency, it's the digital transmission method.
    >
    > CDMA doesn't cause much, if any interference. TDMA and Nextel
    > definitely do because TDMA (the time slots) pulse (iDEN is similar).
    >
    > Ever heard that "tick, tick, tick.......out of a nearby radio when a
    > TDMA or Nextel TX is active?
    >


    GSM phones are horrible with this (at least the PCS variety). Since GSM is
    TDMA based, it does not surprise me.

    Tom Veldhouse





  6. #6
    Hopper
    Guest

    Re: TDMA and iDEN do...


    "Thomas T. Veldhouse" <[email protected]> wrote in message
    news:[email protected]

    > GSM phones are horrible with this (at least the PCS variety). Since GSM

    is
    > TDMA based, it does not surprise me.
    >
    > Tom Veldhouse
    >
    >


    It's not really TDMA based. It instead uses a system of time division. GSM
    incorporates it, but is not an extention TDMA.





  7. #7
    Hopper
    Guest

    Re: TDMA and iDEN do...


    "Thomas T. Veldhouse" <[email protected]> wrote in message
    news:[email protected]

    > GSM phones are horrible with this (at least the PCS variety). Since GSM

    is
    > TDMA based, it does not surprise me.
    >
    > Tom Veldhouse
    >
    >


    It's not really TDMA based. It instead uses a system of time division. GSM
    incorporates it, but is not an extention TDMA.





  8. #8
    Thomas T. Veldhouse
    Guest

    Re: TDMA and iDEN do...

    Hopper wrote:
    > "Thomas T. Veldhouse" <[email protected]> wrote in message
    > news:[email protected]
    >
    >> GSM phones are horrible with this (at least the PCS variety). Since
    >> GSM is TDMA based, it does not surprise me.
    >>
    >> Tom Veldhouse
    >>
    >>

    >
    > It's not really TDMA based. It instead uses a system of time
    > division. GSM incorporates it, but is not an extention TDMA.


    Current GSM implementation is a TDMA implementation. That is not to say
    that it is a subset of the TDMA that most providers use, which is
    technically called IS-136.

    Here is a short blurb I found:

    "Short for Time Division Multiple Access, a technology for delivering
    digital wireless service using time-division multiplexing (TDM). TDMA works
    by dividing a radio frequency into time slots and then allocating slots to
    multiple calls. In this way, a single frequency can support multiple,
    simultaneous data channels. TDMA is used by the GSM digital cellular
    system."

    There is also this which gives a general layman's explanation.

    http://www.arcx.com/sites/CDMAvsTDMA.htm

    Tom Veldhouse





  9. #9
    Thomas T. Veldhouse
    Guest

    Re: TDMA and iDEN do...

    Hopper wrote:
    > "Thomas T. Veldhouse" <[email protected]> wrote in message
    > news:[email protected]
    >
    >> GSM phones are horrible with this (at least the PCS variety). Since
    >> GSM is TDMA based, it does not surprise me.
    >>
    >> Tom Veldhouse
    >>
    >>

    >
    > It's not really TDMA based. It instead uses a system of time
    > division. GSM incorporates it, but is not an extention TDMA.


    Current GSM implementation is a TDMA implementation. That is not to say
    that it is a subset of the TDMA that most providers use, which is
    technically called IS-136.

    Here is a short blurb I found:

    "Short for Time Division Multiple Access, a technology for delivering
    digital wireless service using time-division multiplexing (TDM). TDMA works
    by dividing a radio frequency into time slots and then allocating slots to
    multiple calls. In this way, a single frequency can support multiple,
    simultaneous data channels. TDMA is used by the GSM digital cellular
    system."

    There is also this which gives a general layman's explanation.

    http://www.arcx.com/sites/CDMAvsTDMA.htm

    Tom Veldhouse





  10. #10
    DevilsPGD
    Guest

    Re: TDMA and iDEN do...

    In message <<[email protected]>> "Richard Ness"
    <[email protected]> did ramble:

    >Ever heard that "tick, tick, tick.......out of a nearby radio when a
    >TDMA or Nextel TX is active?


    Heard it? I rely on it, I have my phone placed near an unshielded
    speaker wire so that I can hear it ringing when it's on vibrate in the
    charger.

    --
    You're just jealous because the voices only talk to me.



  11. #11
    DevilsPGD
    Guest

    Re: TDMA and iDEN do...

    In message <<[email protected]>> "Richard Ness"
    <[email protected]> did ramble:

    >Ever heard that "tick, tick, tick.......out of a nearby radio when a
    >TDMA or Nextel TX is active?


    Heard it? I rely on it, I have my phone placed near an unshielded
    speaker wire so that I can hear it ringing when it's on vibrate in the
    charger.

    --
    You're just jealous because the voices only talk to me.



  12. #12
    Michael Notforyou
    Guest

    Re: TDMA and iDEN do...

    "Thomas T. Veldhouse" <[email protected]> wrote in message news:<[email protected]>...
    > "Richard Ness" <[email protected]> wrote in message
    > news:[email protected]
    > > It's not the frequency, it's the digital transmission method.
    > >
    > > CDMA doesn't cause much, if any interference. TDMA and Nextel
    > > definitely do because TDMA (the time slots) pulse (iDEN is similar).
    > >
    > > Ever heard that "tick, tick, tick.......out of a nearby radio when a
    > > TDMA or Nextel TX is active?
    > >

    >
    > GSM phones are horrible with this (at least the PCS variety). Since GSM is
    > TDMA based, it does not surprise me.
    >
    > Tom Veldhouse


    My Nokia 3390 (Cingular/old BellSouth Mobility DCS) does this, but it
    has to be RIGHT NEXT to the speaker. I can hear, "Bzz. Bzz.
    Bzzzzzzzzzzzzzzzzzzzzz. RING!" when I have it next to my laptop's
    JBLPro speakers.

    *Michael Notforyou*



  13. #13
    Michael Notforyou
    Guest

    Re: TDMA and iDEN do...

    "Thomas T. Veldhouse" <[email protected]> wrote in message news:<[email protected]>...
    > "Richard Ness" <[email protected]> wrote in message
    > news:[email protected]
    > > It's not the frequency, it's the digital transmission method.
    > >
    > > CDMA doesn't cause much, if any interference. TDMA and Nextel
    > > definitely do because TDMA (the time slots) pulse (iDEN is similar).
    > >
    > > Ever heard that "tick, tick, tick.......out of a nearby radio when a
    > > TDMA or Nextel TX is active?
    > >

    >
    > GSM phones are horrible with this (at least the PCS variety). Since GSM is
    > TDMA based, it does not surprise me.
    >
    > Tom Veldhouse


    My Nokia 3390 (Cingular/old BellSouth Mobility DCS) does this, but it
    has to be RIGHT NEXT to the speaker. I can hear, "Bzz. Bzz.
    Bzzzzzzzzzzzzzzzzzzzzz. RING!" when I have it next to my laptop's
    JBLPro speakers.

    *Michael Notforyou*



  14. #14
    Al Klein
    Guest

    Re: TDMA and iDEN do...

    On 22 Nov 2003 14:28:23 -0800, [email protected] (Michael
    Notforyou) posted in alt.cellular.verizon:

    >My Nokia 3390 (Cingular/old BellSouth Mobility DCS) does this, but it
    >has to be RIGHT NEXT to the speaker. I can hear, "Bzz. Bzz.
    >Bzzzzzzzzzzzzzzzzzzzzz. RING!" when I have it next to my laptop's
    >JBLPro speakers.


    Good computer speakers are well shielded.



  15. #15
    Al Klein
    Guest

    Re: TDMA and iDEN do...

    On 22 Nov 2003 14:28:23 -0800, [email protected] (Michael
    Notforyou) posted in alt.cellular.verizon:

    >My Nokia 3390 (Cingular/old BellSouth Mobility DCS) does this, but it
    >has to be RIGHT NEXT to the speaker. I can hear, "Bzz. Bzz.
    >Bzzzzzzzzzzzzzzzzzzzzz. RING!" when I have it next to my laptop's
    >JBLPro speakers.


    Good computer speakers are well shielded.



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