Hi

My friend has an unblocked scanner and can only hear one side of the
conversation (cell). Yes, he is listening to the base, not the mobile
frequencies. He says he thinks he is hearing the land line side of the
conversation only because he will hear a tech support guy or a business
talking at times.

What can I tell him?



thx

bob

"steelguitar" wrote in message
ink.net...
Hi

My friend has an unblocked scanner and can only hear one side of the
conversation (cell). Yes, he is listening to the base, not the mobile
frequencies. He says he thinks he is hearing the land line side of the
conversation only because he will hear a tech support guy or a business
talking at times.

What can I tell him?

It's illegal.

Also he may be in for an into court walk if he squalks about the talk.

On Sat, 27 Sep 2003 03:46:16 GMT, "Paul Keenleyside"
wrote:


"steelguitar" wrote in message
link.net...
Hi

My friend has an unblocked scanner and can only hear one side of the
conversation (cell). Yes, he is listening to the base, not the mobile
frequencies. He says he thinks he is hearing the land line side of the
conversation only because he will hear a tech support guy or a business
talking at times.

What can I tell him?

It's illegal.

He was asking about the technology which effectively put an end to
cellular monitoring, not about the law, which did not do anything
meaningful to stop the practice of cellular monitoring.

Every time someone brings up cellular monitoring, or file trading,
some twit just has to pipe in with, "b-b-b-but that's illegal!
sniffle". Why do you ninnies think anyone cares about laws,
against harmless activities, the violation of which is nearly
impossible to detect?

On Sat, 27 Sep 2003 03:22:10 GMT, "steelguitar"
wrote:

Hi

My friend has an unblocked scanner and can only hear one side of the
conversation (cell). Yes, he is listening to the base, not the mobile
frequencies. He says he thinks he is hearing the land line side of the
conversation only because he will hear a tech support guy or a business
talking at times.

What can I tell him?

Take your pick:

1. Welcome to 2003, where cell monitoring is mostly a thing of the
past.

2. Keep scanning, you might occasionally find someone using an older
phone, and in that case you will hear both sides.

3. Get a second receiver, subtract 45 MHz from the base frequency,
and listen for the mobile on that frequency. However, for this to
work, he would need a very tall antenna, in a very strategic location.
Remember, we're talking about low power devices. You may be able to
hear the cell site miles away, but you will be lucky if the cell phone
can be heard the same distance as an FRS radio can.

4. Try cordless instead.

Thanks, Gary

Technically, exactly what is going on to prevent 2 sides of the call?

thx

bob

Gary wrote:
On Sat, 27 Sep 2003 03:22:10 GMT, "steelguitar"
wrote:

Hi

My friend has an unblocked scanner and can only hear one side of the
conversation (cell). Yes, he is listening to the base, not the mobile
frequencies. He says he thinks he is hearing the land line side of
the conversation only because he will hear a tech support guy or a
business talking at times.

What can I tell him?

Take your pick:

1. Welcome to 2003, where cell monitoring is mostly a thing of the
past.

2. Keep scanning, you might occasionally find someone using an older
phone, and in that case you will hear both sides.

3. Get a second receiver, subtract 45 MHz from the base frequency,
and listen for the mobile on that frequency. However, for this to
work, he would need a very tall antenna, in a very strategic location.
Remember, we're talking about low power devices. You may be able to
hear the cell site miles away, but you will be lucky if the cell phone
can be heard the same distance as an FRS radio can.

4. Try cordless instead.

In article . net,
says...
Technically, exactly what is going on to prevent 2 sides of the call?

Aside from the issues of being in range of the remote unit, the problem
is that a mobile phone call operates on two frequencies. This is
necessary so that it works like a regular phone call, with the party on
one side being able to interrupt and the party on the other side able to
hear the interruption even though (s)he is still talking. That's called
full-duplex operation. With regular two-way radio, you both operate on
the same frequency and only one can transmit at a time. The other party
has to wait until the first person has stopped transmitting in order to
be able to be heard by that person.

In full-duplex, each side of the conversation has to be on a different
frequency. You can't transmit and receive on the same frequency at the
same time on the same antenna -- just doesn't work. The minute you
transmitted, you'd be jamming yourself.

--

-- //Steve//

Steve Silverwood, KB6OJS
Fountain Valley, CA
Email:
Web: http://home.earthlink.net/~kb6ojs_steve

Thanks, Steve

So it never was possible to hear both sides of the conversation on one
freq., even back in the analog only days?

thx

bob



Steve Silverwood wrote:
In article . net,
says...
Technically, exactly what is going on to prevent 2 sides of the call?

Aside from the issues of being in range of the remote unit, the
problem is that a mobile phone call operates on two frequencies.
This is necessary so that it works like a regular phone call, with
the party on one side being able to interrupt and the party on the
other side able to hear the interruption even though (s)he is still
talking. That's called full-duplex operation. With regular two-way
radio, you both operate on the same frequency and only one can
transmit at a time. The other party has to wait until the first
person has stopped transmitting in order to be able to be heard by
that person.

In full-duplex, each side of the conversation has to be on a different
frequency. You can't transmit and receive on the same frequency at
the same time on the same antenna -- just doesn't work. The minute
you transmitted, you'd be jamming yourself.

In article . net,
says...
So it never was possible to hear both sides of the conversation on one
freq., even back in the analog only days?

Only if you had two receivers, each tuned to one of the two frequencies
involved.

--

-- //Steve//

Steve Silverwood, KB6OJS
Fountain Valley, CA
Email:
Web: http://home.earthlink.net/~kb6ojs_steve

In article ,
says...
In article . net,
says...
So it never was possible to hear both sides of the conversation on one
freq., even back in the analog only days?

Only if you had two receivers, each tuned to one of the two frequencies
involved.



Umm, incorrect.

BDK

Explanation?

thx

bob



BDK wrote:
In article ,
says...
In article . net,
says...
So it never was possible to hear both sides of the conversation on
one freq., even back in the analog only days?

Only if you had two receivers, each tuned to one of the two
frequencies involved.



Umm, incorrect.

BDK