Deutsche Telekom and T-Mobile

On Wed, 14 Jan 2004 06:05:03 GMT, David S <[email protected]> posted
in alt.cellular.verizon:

>On Wed, 14 Jan 2004 05:17:24 GMT, Al Klein <[email protected]> chose to add
>this to the great equation of life, the universe, and everything:
>
>>On Tue, 13 Jan 2004 05:57:01 GMT, David S <[email protected]> posted
>>in alt.cellular.verizon:
>>
>>>On 12 Jan 2004 02:10:14 GMT, [email protected]lid (CharlesH) chose to add
>>>this to the great equation of life, the universe, and everything:
>>
>>>>The idea is that a CDMA signal is scattered all over a "carrier" (1.25MHz
>>>>for cellular/PCS phones), so the jammer has to spread his signal over
>>>>the entire carrier with sufficient power to jam the communication.
>>
>>>Okay, so how hard is that to do? (Honest question.)
>>
>>Very.
>>
>>>It seems to me they
>>>wouldn't need all that much power to block a cellular-strength signal
>>>within the confines of a small building.
>>
>>Getting a signal that wide is the problem. A CDMA signal doesn't
>>exist at all frequencies in the bandwidth at once - a jammer has to.
>>Once you have a signal that wide, amplifying it isn't the problem.
>>You could jam an entire city almost as easily as you could jam one
>>building. (And remember that it would take at least a few
>>transmitters to jam an entire building - signals at those frequencies
>>don't penetrate steel walls well.)
>
>But we're talking about a McDonald's, which is pretty much all one room.

I guess I missed the beginning of the thread. Are we talking about
jamming McDonald's radio system? If so, that's a single channel
system, not CDMA. (I believe McDonald's is licensed for high band -
150-170 MHz.)

Or are we talking about jamming cell phones in McDonald's restaurants,
which is highly illegal, even if done by McDonald's.

---

› See More: Deutsche Telekom and T-Mobile

On Wed, 14 Jan 2004 07:02:40 GMT, Gray Frierson Haertig
<[email protected]> posted in alt.cellular.verizon:

>Creating a jamming signal is no more difficult than generating the CDMA
>signal. The problem is getting the interfering signal power high enough
>AT THE RECEIVER to jam the signal.

And with the same spread.

> >But we're talking about a McDonald's, which is pretty much all one room.
>
> I guess I missed the beginning of the thread. Are we talking about
> jamming McDonald's radio system? If so, that's a single channel
> system, not CDMA. (I believe McDonald's is licensed for high band -
> 150-170 MHz.)
>
> Or are we talking about jamming cell phones in McDonald's restaurants,
> which is highly illegal, even if done by McDonald's.

I think it was something along the lines of T-Mobile merging with Mc
Donald's and then putting a cell tower in every McDonalds, and then someone
mentioned that CDMA was a military development and resists jamming. ahhh,
isn't it amazing how conversations wonder?

The spread is not particularly difficult - after all, your cell phone
can do it.


Gray


Al Klein wrote:
>
> On Wed, 14 Jan 2004 07:02:40 GMT, Gray Frierson Haertig
> <[email protected]> posted in alt.cellular.verizon:
>
> >Creating a jamming signal is no more difficult than generating the CDMA
> >signal. The problem is getting the interfering signal power high enough
> >AT THE RECEIVER to jam the signal.
>
> And with the same spread.

--
Telecommunications Engineering
Gray Frierson Haertig & Assoc.
820 North River Street, Suite 100
Portland, Oregon 97227
503-282-2989
503-282-3181 FAX
[email protected]

Gray Frierson Haertig wrote:
> The spread is not particularly difficult - after all, your cell phone
> can do it.

Not quite. The cell phone isn't transmitting on all frequencies in the
channel simultaneously, but a jammer would have to. Otherwise it'd just
look like a particularly rude cell phone.

Jesse

>Cell towers are how much? 3 watts? (I don't know)

GSM Radios that I have been installing of late are 35 watt's out of the radio.
They typically work into a 12db antenna giveing them an ERP of several hundred
watts.


--
John S.
e-mail responses to - john at kiana dot net

On Thu, 15 Jan 2004 04:22:49 GMT, "Trey" <[email protected]>
wrote:

>I think it was something along the lines of T-Mobile merging with Mc
>Donald's and then putting a cell tower in every McDonalds, and then someone
>mentioned that CDMA was a military development and resists jamming. ahhh,
>isn't it amazing how conversations wonder?

Does that mean that if you re-up with T-McDonald you can get a free
Big Mac with fries?
- - - - - - - - - - - - - - - - - - - - - - - - - -
remove NO from .NOcom to reply

On Thu, 15 Jan 2004 04:22:49 GMT, "Trey" <[email protected]> chose
to add this to the great equation of life, the universe, and everything:

>> >But we're talking about a McDonald's, which is pretty much all one room.
>>
>> I guess I missed the beginning of the thread. Are we talking about
>> jamming McDonald's radio system? If so, that's a single channel
>> system, not CDMA. (I believe McDonald's is licensed for high band -
>> 150-170 MHz.)
>>
>> Or are we talking about jamming cell phones in McDonald's restaurants,
>> which is highly illegal, even if done by McDonald's.
>
>I think it was something along the lines of T-Mobile merging with Mc

I thought it was ATTWS + McD.

>Donald's and then putting a cell tower in every McDonalds, and then someone
>mentioned that CDMA was a military development and resists jamming. ahhh,
>isn't it amazing how conversations wonder?

And how they wander, too. :-)

--
David Streeter, "an internet god" -- Dave Barry
http://home.att.net/~dwstreeter
Expect a train on ANY track at ANY time.
"A man's got to be a man or he's not a man." - Maj. Frank Burns

On Thu, 15 Jan 2004 03:30:38 GMT, Al Klein <[email protected]> chose to add
this to the great equation of life, the universe, and everything:

>On Wed, 14 Jan 2004 06:05:03 GMT, David S <[email protected]> posted
>in alt.cellular.verizon:
>
>>On Wed, 14 Jan 2004 05:17:24 GMT, Al Klein <[email protected]> chose to add
>>this to the great equation of life, the universe, and everything:
>>
>>>On Tue, 13 Jan 2004 05:57:01 GMT, David S <[email protected]> posted
>>>in alt.cellular.verizon:
>>>
>>>>On 12 Jan 2004 02:10:14 GMT, [email protected]lid (CharlesH) chose to add
>>>>this to the great equation of life, the universe, and everything:
>>>
>>>>>The idea is that a CDMA signal is scattered all over a "carrier" (1.25MHz
>>>>>for cellular/PCS phones), so the jammer has to spread his signal over
>>>>>the entire carrier with sufficient power to jam the communication.
>>>
>>>>Okay, so how hard is that to do? (Honest question.)
>>>
>>>Very.
>>>
>>>>It seems to me they
>>>>wouldn't need all that much power to block a cellular-strength signal
>>>>within the confines of a small building.
>>>
>>>Getting a signal that wide is the problem. A CDMA signal doesn't
>>>exist at all frequencies in the bandwidth at once - a jammer has to.
>>>Once you have a signal that wide, amplifying it isn't the problem.
>>>You could jam an entire city almost as easily as you could jam one
>>>building. (And remember that it would take at least a few
>>>transmitters to jam an entire building - signals at those frequencies
>>>don't penetrate steel walls well.)
>>
>>But we're talking about a McDonald's, which is pretty much all one room.
>
>I guess I missed the beginning of the thread. Are we talking about
>jamming McDonald's radio system? If so, that's a single channel

No.

>system, not CDMA. (I believe McDonald's is licensed for high band -
>150-170 MHz.)

At one time, they used the same frequency (49.x) as GE Voice One and some
Maxon wireless headsets.

>Or are we talking about jamming cell phones in McDonald's restaurants,
>which is highly illegal, even if done by McDonald's.

Yes. Someone suggested (probably facetiously) that ATTWS was merging with
McD's. I said that would be a good way to expand their network: put a cell
in every McD's, or as an alternative, CDMA jammers.

--
David Streeter, "an internet god" -- Dave Barry
http://home.att.net/~dwstreeter
Expect a train on ANY track at ANY time.
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Feb. 13th - Mar. 27th 10:00a.m.-5:00p.m.
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Thank you
General Manager

- flyer distributed to all guests at a Japanese hotel

On Sat, 17 Jan 2004 20:13:12 GMT, David S <[email protected]> posted
in alt.cellular.verizon:

>Yes. Someone suggested (probably facetiously) that ATTWS was merging with
>McD's. I said that would be a good way to expand their network: put a cell
>in every McD's, or as an alternative, CDMA jammers.

Difficult to jam CDMA running on the same channels as TDMA, though.
It would take jammers tailored to individual locations.