Phone conversation monitoring

Phone conversation monitoring

Post by David L. Haa » Tue, 18 Jun 1996 04:00:00

Yo everybody,

I have been picking up a non mobile phone conversation on a baby monitor frequency of
49.875Mhz. Is this normal? It isn't a regular cordless phone frequency.  

 Also between 1020 and 1030Mhz I can receive 4 - 6  mobile phone conversations.  I live
in the Fayetteville NC area.  If these are not cellular.  What might they be?  Please
enlighten me oh wizards of the electromagnetic spectrum.....

D. Haas

 
 
 

Phone conversation monitoring

Post by Porchno » Tue, 18 Jun 1996 04:00:00



> I have been picking up a non mobile phone conversation on a baby monitor frequency of
> 49.875Mhz. Is this normal? It isn't a regular cordless phone frequency.

        David:
                Actually, it is a regular cordless phone frequency.
                It is the frequency for the handset for which 46.730            
                is the base frequency.  You are almost always better
                off listening to the base frequencies, because they
                are true duplex (you hear both sides of the conver-
                sation) and the signals are generally stronger.
 
 
 

Phone conversation monitoring

Post by Bill Crocke » Tue, 18 Jun 1996 04:00:00


> Yo everybody,

> I have been picking up a non mobile phone conversation on a baby monitor frequency of
> 49.875Mhz. Is this normal? It isn't a regular cordless phone frequency.

>  Also between 1020 and 1030Mhz I can receive 4 - 6  mobile phone conversations.  I live
> in the Fayetteville NC area.  If these are not cellular.  What might they be?  Please
> enlighten me oh wizards of the electromagnetic spectrum.....

> D. Haas

Dave:

The cordless phones work on two different frequencies at the same time.
One is for the handset to talk to the base, and the other is the base to
talk back to the handset.  The 49 MHz area if the handset.  And yes, the
49 MHz area is also used for those baby monitors.

As for 1020 - 1030 MHz...you're most likely hearing what is called
images of the Cellular band.  It's not "right on" frequency.  It has to
do with the frequency of the IF's in your scanner, harmonics, etc.

Bill Crocker

 
 
 

Phone conversation monitoring

Post by whisp » Wed, 19 Jun 1996 04:00:00

Quote:

>I have been picking up a non mobile phone conversation on a baby monitor
frequency of
>49.875Mhz. Is this normal? It isn't a regular cordless phone frequency.

The frequency you mention is one of the portable frequency for cordless
telephones. Yes, it is also used for baby monitors.

Pete
VE3YYY

 
 
 

Phone conversation monitoring

Post by F. Barry Mullig » Wed, 19 Jun 1996 04:00:00


Quote:> I have been picking up a non mobile phone conversation on a baby monitor
> frequency of 49.875Mhz.

That is the handset frequency for the U.S. cordless Ch 20, which is the same
as the baby monitor "D" channel. The paired cordless base freq. is 46.73 MHz.

                                                        /* barry /&

 
 
 

Phone conversation monitoring

Post by cg.. » Wed, 19 Jun 1996 04:00:00

On Mon, 17 Jun 1996 16:15:52 -0400, "David L. Haas"


>Yo everybody,

>I have been picking up a non mobile phone conversation on a baby monitor frequency of
>49.875Mhz. Is this normal? It isn't a regular cordless phone frequency.  

> Also between 1020 and 1030Mhz I can receive 4 - 6  mobile phone conversations.  I live
>in the Fayetteville NC area.  If these are not cellular.  What might they be?  Please
>enlighten me oh wizards of the electromagnetic spectrum.....

>D. Haas

There are now 25 channels for the 49mHz phones.
They are listed in the 1995 police call.
You heard ch. 20

Charley

 
 
 

Phone conversation monitoring

Post by Dmered.. » Wed, 19 Jun 1996 04:00:00


LH>Subject: Phone conversation monitoring

LH>Yo everybody,

LH>I have been picking up a non mobile phone conversation on a baby monitor fre
ue
LH>ncy of
LH>49.875Mhz. Is this normal? It isn't a regular cordless phone frequency.  

LH> Also between 1020 and 1030Mhz I can receive 4 - 6  mobile phone conversatio
s.
LH>  I live
LH>in the Fayetteville NC area.  If these are not cellular.  What might they be

LH>Please
LH>enlighten me oh wizards of the electromagnetic spectrum.....

LH>D. Haas

You are likely hearing "images" from the local cells in the area...Or it
is possible that you are picking up SMR, but I doubt it, not in that
spectrum...

Daniel

________________________________________________________________
Daniel J. Meredith               System Administrator PHX-AZ.COM

Phoenix, Arizona  85064-5378     Voice & Fax: +1-602-912-5671

[Leadership]
"The Sign Of A True Leader Is One Who Leads, & Is Not Afraid
To Be Led."

---
 * OLXWin 1.00 * This tagline is umop apisdn

 
 
 

Phone conversation monitoring

Post by J.W. Wolfingt » Wed, 19 Jun 1996 04:00:00

On Mon, 17 Jun 1996 16:15:52 -0400, "David L. Haas"


>Yo everybody,

>I have been picking up a non mobile phone conversation on a baby monitor frequency of
>49.875Mhz. Is this normal? It isn't a regular cordless phone frequency.  

> Also between 1020 and 1030Mhz I can receive 4 - 6  mobile phone conversations.  I live
>in the Fayetteville NC area.  If these are not cellular.  What might they be?  Please
>enlighten me oh wizards of the electromagnetic spectrum.....

>D. Haas

The first is a cordless phone.  This is one of the new channels added
when the FCC allocated 15 more channels.  The 25 channel phones have
provisions built in to detect when a baby monitor is in use on the
same channel so that the phone will pick an unused channel to
eleminate interference.  

The conversations you hear around 1020 are more than likely images and
are probably cellular in nature.

J.W. Wolfington

 
 
 

Phone conversation monitoring

Post by Steve Wo » Wed, 19 Jun 1996 04:00:00


: Yo everybody,

: I have been picking up a non mobile phone conversation on a baby monitor frequency of
: 49.875Mhz. Is this normal? It isn't a regular cordless phone frequency.  

Yes, this is a cordless phone frequency.

:  Also between 1020 and 1030Mhz I can receive 4 - 6  mobile phone conversations.  I live
: in the Fayetteville NC area.  If these are not cellular.  What might they be?  Please
: enlighten me oh wizards of the electromagnetic spectrum.....

These are "images" of cellular phone calls.  The true frequency is
between 870 and 894Mhz, which your radio probably won't tune to.  But most
radios receive these (and other) frequencies, not as clearly, at some
other place on the "dial".  Exactly where you find the images varies
depending on how the radio is designed and what intermediate frequencies
are used.

 
 
 

Phone conversation monitoring

Post by a.. » Thu, 20 Jun 1996 04:00:00



> > I have been picking up a non mobile phone conversation on a baby monitor
> > frequency of 49.875Mhz.

> That is the handset frequency for the U.S. cordless Ch 20, which is the same
> as the baby monitor "D" channel. The paired cordless base freq. is 46.73 MHz.

In Canada thats channel 05.  46.7700 Base 49.875 Handset

Which is also Baby Monitor channel 04

Mr.CodeGrabber

 
 
 

Phone conversation monitoring

Post by Steve Arnol » Thu, 20 Jun 1996 04:00:00


> Yo everybody,

> I have been picking up a non mobile phone conversation on a baby monitor frequency of
> 49.875Mhz. Is this normal? It isn't a regular cordless phone frequency.

>  Also between 1020 and 1030Mhz I can receive 4 - 6  mobile phone conversations.  I live
> in the Fayetteville NC area.  If these are not cellular.  What might they be?  Please
> enlighten me oh wizards of the electromagnetic spectrum.....

> D. Haas

49.875 is channel 5 of the 10 channels in the cordless phone freqs.
 
 
 

Phone conversation monitoring

Post by Steve Wo » Fri, 21 Jun 1996 04:00:00

: There are now 25 channels for the 49mHz phones.
: They are listed in the 1995 police call.
: You heard ch. 20

I thought police call didn't list phone frequencies.  In mine the only
blurb they make is to list that the freqs 824-849 and 869-894 are deleted
from scanners sold in the US.  They don't say a peep as to what these
frequencies are used for.  Nor do they mention the cordless freqs
anywhere.  Mine is the latest one, 1996.

 
 
 

Phone conversation monitoring

Post by J.W. Wolfingt » Fri, 21 Jun 1996 04:00:00

Quote:>49.875 is channel 5 of the 10 channels in the cordless phone freqs.

Hey man, hate to break the news to ya, but a long time ago the FCC
added 15 new channel pairs for cordless telephone use.  There are no
longer 10 channels, but rather 25.

And 49.875 is no longer channel 5, but rather channel 20.

Now, since you probably enjoy listening to people's conversations, you
can add 15 more channels of activity to your scanner.

 
 
 

Phone conversation monitoring

Post by J.W. Wolfingt » Fri, 21 Jun 1996 04:00:00




>: There are now 25 channels for the 49mHz phones.
>: They are listed in the 1995 police call.
>: You heard ch. 20

>I thought police call didn't list phone frequencies.  In mine the only
>blurb they make is to list that the freqs 824-849 and 869-894 are deleted
>from scanners sold in the US.  They don't say a peep as to what these
>frequencies are used for.  Nor do they mention the cordless freqs
>anywhere.  Mine is the latest one, 1996.

Look in the back of the book where VHF and UHF freqs are listed with
service codes.  
 
 
 

Phone conversation monitoring

Post by whisp » Sat, 22 Jun 1996 04:00:00

Quote:>49.875 is channel 5 of the 10 channels in the cordless phone freqs.

There are now 25 channels. The old 1 - 10 have been renumbered 16 - 25.
The actual frequencies have been posted already in this newsgroup, so I
won't take up bandwidth.

Pete