Question about Nextel 800MHz enterference

I just posted this to alt.cellular and then found this group.. which I think
this message belongs in..... please see my question below:

I just bought a couple i710 phones with Nextel and whenever the phone is on
I hear a clicking sound in my computer speakers and my monitor goes
completely wild (horizontal lines) when I am speaking with someone on the
i710.

I used to have a Cricket phone and never had a problem with this around
speakers or computer monitors.

Cricket works at 1900Mhz while Nextel works at 800Mhz. I suppose this has
something to do with the static I'm hearing/seeing.

Here is my question. I don't know a lot about this... or how this works, but
is the Nextel phone outputting more hazardous radiation if I am able to see
the static in the monitor and hear the static in my speakers?

I just plunked out a lot of money for these phones and had absolutely no
idea they caused interference like this. I hope I am not exposing myself to
more radiation than I had with my old cell phone.

On Fri, 31 Dec 2004 23:04:09 -0700, "Rich" <nomore@spam.no> wrote:

>I just posted this to alt.cellular and then found this group.. which I think
>this message belongs in..... please see my question below:
>
>I just bought a couple i710 phones with Nextel and whenever the phone is on
>I hear a clicking sound in my computer speakers and my monitor goes
>completely wild (horizontal lines) when I am speaking with someone on the
>i710.
>
>I used to have a Cricket phone and never had a problem with this around
>speakers or computer monitors.
>
>Cricket works at 1900Mhz while Nextel works at 800Mhz. I suppose this has
>something to do with the static I'm hearing/seeing.
>
>Here is my question. I don't know a lot about this... or how this works, but
>is the Nextel phone outputting more hazardous radiation if I am able to see
>the static in the monitor and hear the static in my speakers?
>
>I just plunked out a lot of money for these phones and had absolutely no
>idea they caused interference like this. I hope I am not exposing myself to
>more radiation than I had with my old cell phone.

The clicking is the phone transmitting to the tower. Nextel is famous
for this.

As to radiation.... Wear a tin foil hat.
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To reply, remove TheObvious from my e-mail address.

"Evan Platt" <evan@TheObvious.espphotography.com> wrote in message
news:3lpdt010r8s8uboiqu0vv07fj9jf2l3ra5@4ax.com...
> On Fri, 31 Dec 2004 23:04:09 -0700, "Rich" <nomore@spam.no> wrote:
>
> >I just posted this to alt.cellular and then found this group.. which I
think
> >this message belongs in..... please see my question below:
> >
> >I just bought a couple i710 phones with Nextel and whenever the phone is
on
> >I hear a clicking sound in my computer speakers and my monitor goes
> >completely wild (horizontal lines) when I am speaking with someone on the
> >i710.
> >
> >I used to have a Cricket phone and never had a problem with this around
> >speakers or computer monitors.
> >
> >Cricket works at 1900Mhz while Nextel works at 800Mhz. I suppose this has
> >something to do with the static I'm hearing/seeing.
> >
> >Here is my question. I don't know a lot about this... or how this works,
but
> >is the Nextel phone outputting more hazardous radiation if I am able to
see
> >the static in the monitor and hear the static in my speakers?
> >
> >I just plunked out a lot of money for these phones and had absolutely no
> >idea they caused interference like this. I hope I am not exposing myself
to
> >more radiation than I had with my old cell phone.
>
> The clicking is the phone transmitting to the tower. Nextel is famous
> for this.
>
> As to radiation.... Wear a tin foil hat.

Someone in another group suggested it is GSM vs CDMA.. does one emit more
radiation than the other??

Nextel uses iDEN, which is also based on the same principals as GSM and TDMA .
Meaning that they use a TIME based digital modulation scheme. NON continuous TX...

What you are hearing is the TX (transmitter) pulsing as it just transmits during it's time slot.
So, it's not the frequency the phone is operating at, it's the (TDMA) digital scheme it's using.

Your Cricket uses CDMA, which is a spread spectrum transmission, less likely to
cause RFI (radio frequency interference) in close proximity devices.

One could speculate that there is the possibility that at 1900MHz, the pulsing TX of an
iDEN or other TDMA based device would cause less RFI because of the shorter wavelengths.
ERP being the same.



"Rich" <nomore@spam.no> wrote in message news:g1rBd.3783$232.2335@fed1read05...
>I just posted this to alt.cellular and then found this group.. which I think
> this message belongs in..... please see my question below:
>
> I just bought a couple i710 phones with Nextel and whenever the phone is on
> I hear a clicking sound in my computer speakers and my monitor goes
> completely wild (horizontal lines) when I am speaking with someone on the
> i710.
>
> I used to have a Cricket phone and never had a problem with this around
> speakers or computer monitors.
>
> Cricket works at 1900Mhz while Nextel works at 800Mhz. I suppose this has
> something to do with the static I'm hearing/seeing.
>
> Here is my question. I don't know a lot about this... or how this works, but
> is the Nextel phone outputting more hazardous radiation if I am able to see
> the static in the monitor and hear the static in my speakers?
>
> I just plunked out a lot of money for these phones and had absolutely no
> idea they caused interference like this. I hope I am not exposing myself to
> more radiation than I had with my old cell phone.
>
>

Rich wrote:

> Someone in another group suggested it is GSM vs CDMA.. does one emit more
> radiation than the other??

Nextel is neither GSM nor CDMA. iDEN is a hybrid two-way/cellular protocol
based on TDMA. (GSM is also based on TDMA, but isn't the same protocol.)


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KE4QPF writes:

Courtesy - http://idenphones.motorola.com/idenH...at_is_iden.jsp

TDMA (Time Division Multiple Access):
iDEN's digital technology divides a channel into different "slots". Each slot can carry one voice or data transmission. By deploying an iDEN system, service providers can increase capacity by as much as six times their current analog Specialized Mobile Radio (SMR) network.

This capacity increase is accomplished using a state-of-the-art technology called TDMA. TDMA utilizes Global Positioning Satellites (GPS) to reference a synchronized time, and then divides the channel into time slots. As a result, channel capacity is increased because one channel has now been converted to multiple voice or data transmission vehicles. TDMA is a proven technology in cellular systems across Europe, the US, and in Japan. iDEN utilizes TDMA for Maximum Spectrum Efficiency.

VSELP (Vector Sum Excited Linear Prediction):
VSELP digitally codes and significantly compresses voice signals, increasing radio channel capacity by reducing the amount of information that needs to be transmitted. VSELP provides iDEN systems with the capability to fit voice transmission into the smaller transmissions vehicle that results from TDMA.

QAM (Quad Amplitude Modulation):
Quad Amplitude Modulation results in 64 kbps data rate over a 25 kHz channel.