RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > Scanners and Receivers Forums > General Scanning Discussion

General Scanning Discussion For general questions not specific to a model of scanner or general discussion of use of a scanner. Location specific posts should be directed to the regional forums listed below.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 09-20-2007, 9:48 AM
Member
   
Join Date: Aug 2007
Location: PA
Posts: 4
Default Pro-433 Picking up cordless phone

First of all great site with loads of info. Me...well I'm fairly new to scanning on my own, parents always had one and my dad just bought me a PRO-433 from RS. Now I ask you guys if this type of behavior is normal: My PRO-433 is picking up my 5.8GHz G.E. cordless phone. It seems to be picking it up on a few different freqs and it is completely driving my wife crazy. If she had her way I would be getting rid of the scanner just because of this. Now I've been locking out the channels that it is picking it up on but I was under the impression that it would not pick up a cordless phone. Any ideas to help with my dilemma or just keep the channels locked out? The channels it is picking up on were pre-programmed in the scanner from the factory and don't match up with any of my local freqs but it is still troubling me.

The other issue is whether or not to buy a new phone because if my scanner can pick it up then I'd imagine other people could too or would they have to be sitting in my dining room to receive it?

Thanks for your help guys and if you need any more info just let me know.

-Hans
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 09-20-2007, 10:26 AM
Tryton's Avatar
Member
  Shack Photos
Shack photos
Audio Feed Provider
Audio Feed Provider
Amateur Radio Operator
Amateur Radio
 
Join Date: Sep 2007
Location: Largo, Fl
Posts: 550
Default

what freq is it picking it up at? I also have a GE 5.8, so I want to make sure im not broadcasting as well...
__________________
Equipment: Uniden Bearcat BCD996XT X 2
________________________________

K1SPL
Reply With Quote
  #3 (permalink)  
Old 09-20-2007, 10:34 AM
rcvmo's Avatar
Member
   
Join Date: Aug 2004
Location: Romulus, Mi.
Posts: 439
Default

It sounds like the heterodyne or in laymen's terms a combination of the scanner's recieved frequency, the scanner's IF frequency, and the cordless phone's frequencies all mixing together and showing up on one of those frequencies you are listening to.
The cordless phone may be throwing a harmonic frequency which can also be picked up by the scanner at certain freq.'s. It may not be as clear, but ledgible. And you probably would have to be somewhere only limited to inside your house to hear it.

rcvmo
Reply With Quote
  #4 (permalink)  
Old 09-20-2007, 10:52 AM
n2mdk's Avatar
Member
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jul 2007
Location: Ames, IA
Posts: 2,542
Default

Since those 5.8GHz phones all seem to transmit digitally, I would have to imagine your picking up the the internal frequencies of the phone itself rather than the actual output from it. I would think that proximity is the main reason you can hear it.
__________________
Jerri

VX-5
FT-60R

Pro-97
BC246T
BC780XLT
BR330T
BCT15
Grundig Satellit 700
Reply With Quote
  #5 (permalink)  
Old 09-20-2007, 10:55 AM
Texas DB Admin
  RadioReference Database Admininstrator
Database Admin
 
Join Date: Dec 2002
Location: Dallas Texas
Posts: 1,280
Default

Most of the 2GHz and 5.8GHz phones have a "return" or "fallback" frequency in the unlicensed 900mhz band. Very few GHz phones actually use the advertised bands exclusively. Read the fine print, it's in there somewhere.

Russell
Reply With Quote
Sponsored links
  #6 (permalink)  
Old 09-20-2007, 12:07 PM
Member
   
Join Date: Sep 2007
Location: Twin Cities, Minn.
Posts: 9
Default

Quote:
Originally Posted by Russell
Most of the 2GHz and 5.8GHz phones have a "return" or "fallback" frequency in the unlicensed 900mhz band. Very few GHz phones actually use the advertised bands exclusively. Read the fine print, it's in there somewhere.
Exactly. Also, a cordless phone uses one freq. for the base and another for the handheld. Surprisingly many 2.4 and 5.8GHz phones use analog 900MHz frequencies for the handheld. The 900MHz portion can be heard on a scanner, so my guess is your '433 is picking up some sort of an image of the 900MHz frequency (assuming your phone is analog and uses the 900 band).

You can look up a phone's freq. range in the FCC database if you're really curious...you just need the FCC ID off the phone. These are near the model and serial # tag.

To your other point, since I got into scanning I promised myself to NEVER own an analog cordless. As you've found out, there is just too much of a risk that someone could hear it. I'd suggest replacing your phone with one that is digital or "digital spread spectrum". If it's not digital there is a strong possibility it can be easily heard on a scanner. Of course for credit card #s, etc. it's always best to use a good ol' corded phone.

I admit that I did own a Uniden 46/49MHz analog cordless beast at one point, but it had a scramble (voice inversion) feature that you could switch on and off!
Reply With Quote
  #7 (permalink)  
Old 09-20-2007, 12:20 PM
Member
   
Join Date: Aug 2007
Location: PA
Posts: 4
Default

I'll have to get the freqs when I get home but I'll let you know what they are.
Reply With Quote
  #8 (permalink)  
Old 09-20-2007, 12:22 PM
mciupa's Avatar
Member
  RadioReference Database Admininstrator
Database Admin
 
Join Date: Nov 2002
Posts: 4,867
Default

Quote:
Originally Posted by hillikus
I'll have to get the freqs when I get home but I'll let you know what they are.
You are hearing the handset freq. I bet . Check between 924 to 928 mhz. They transmit to the base unit in that range.
Reply With Quote
  #9 (permalink)  
Old 09-20-2007, 12:38 PM
Member
   
Join Date: Aug 2007
Location: PA
Posts: 4
Default

Quote:
Originally Posted by mciupa
You are hearing the handset freq. I bet . Check between 924 to 928 mhz. They transmit to the base unit in that range.
If I remember correctly the freqs were in the 460-465 mhz range. Ok I called my wife and had her look at the scanner, one of the frequencies was 462.6125. I say one of them because there were more than one and one of the times that the scanner was picking it up I changed the channel on the phone and it stopped. Should have mentioned that in my first post.


Isn't 462.6125 a FRS Freq? Now I'm really not understanding some things.

Last edited by hillikus; 09-20-2007 at 12:41 PM..
Reply With Quote
Sponsored links
  #10 (permalink)  
Old 09-20-2007, 1:17 PM
Member
   
Join Date: Dec 2002
Location: Western U.S.
Posts: 2,406
Default

I was at my sister's house and while they used their 5.8 GHz cordless phone I heard both sides of the conversation in the area of 406-410 (I forget the exact frq.) MHz on my scanner. We were all surprised.
Reply With Quote
  #11 (permalink)  
Old 09-20-2007, 3:41 PM
Texas DB Admin
  RadioReference Database Admininstrator
Database Admin
 
Join Date: Dec 2002
Location: Dallas Texas
Posts: 1,280
Default

I would think for it to show up on that freq it would have to be the sub-harmonic thing. But I still think it's a sub-harmonic of a 900 mhz channel. That is really wierd.

Get a new 'digital spread spectrum' phone. Getting rid of your scanner doesn't prevent others from hearing your wife's phone calls. Analog cordless phones are such easy targets. DSS phones do cost more, but they can't easily be monitored and the sound quality and reliability are much better.

Russell

Last edited by Russell; 09-21-2007 at 10:41 AM..
Reply With Quote
  #12 (permalink)  
Old 09-20-2007, 8:37 PM
Member
   
Join Date: Sep 2006
Location: Oakland & Roscommon Counties MI
Posts: 550
Default

ive scanned the middle 900 MHZ band before and ive heard conversations from people i dont know of, it wasn't a neighbor i knew, so it can be heard for a little ways, but i dont think it can be heard to far from your base.
Reply With Quote
  #13 (permalink)  
Old 09-21-2007, 2:10 PM
Member
   
Join Date: Aug 2007
Location: PA
Posts: 4
Default Update

Well last night I was scanning and it seemed to pick up the phone conversation anytime it would lock on a channel regardless of the channel. Let me explain, while I was testing the phone the scanner locked on my county fire dispatch channel and I could hear the phone conversation AND the dispatcher. Just out of curiosity, while the dispatcher was still talking I locked the scanner onto the police channel and they also happened to be talking and yet again I could hear both their conversation and mine through the scanner. Well just wanted to enlist the help of the experts. Thanks again and I think a DSS phone may be in my future.

-Hans
Reply With Quote
  #14 (permalink)  
Old 09-21-2007, 2:30 PM
rockag41's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Oct 2003
Location: San Antonio, Texas
Posts: 128
Default

I got rid of my home phone altogether. Everyone in my family has a cell phone. The only people that used by home phone wanted to sell me something. Saving about $40.month to go towards the new GRE.
__________________
Experience is what you have left when everything else is gone.
Reply With Quote
  #15 (permalink)  
Old 09-21-2007, 6:59 PM
kb2vxa's Avatar
Completely Banned for the Greater Good
  Amateur Radio Operator
Amateur Radio
 
Join Date: Mar 2005
Location: Point Pleasant Beach, N.J.
Posts: 6,127
Default

Hi Hans and all,

See what you started? Ask a simple question and these guys will analyze it to death while I'll give you a simple answer. Frankly I hate crappy home electronics because pretty much whatever it is radiates spurious signals all over the place and cordless phones are no exception. The solution is simply live with it or live without it, the crappy cordless phone that is. Ask yourself the question "Do I really need this thing?" and act accordingly.

"The other issue is whether or not to buy a new phone because if my scanner can pick it up then I'd imagine other people could too or would they have to be sitting in my dining room to receive it?"

Unless you have a spook in the neighborhood I wouldn't worry about it. If you're really that paranoid just remember a wireless device is a broadcasting station, secrets only remain secrets when you keep your mouth shut.
Reply With Quote
Sponsored links
        
  #16 (permalink)  
Old 09-14-2008, 11:04 PM
Michael-SATX's Avatar
Member
  Shack Photos
Shack photos
Premium Subscriber
Premium Subscriber
 
Join Date: Jan 2005
Location: San Antonio, Texas
Posts: 656
Default

I'd say replace that cordless phones with a DSS or DECT 6.0 model. Also, if your Pro-433 is within 90-days ... I would go back to RS and exchange it for AT LEAST a Pro-2055 with alpha-text tags :-))
The Pro-433 was just another feature-less flop that seemed to go on clearence as soon as it launched !
Ah heck, some might even consider either the Pro-2096 or Pro-96 models that just recently dropped down to $379 ... or hope for exchange purposes that the Pro-106 "hurries-up" getting to the shelves ?
Say while scanning .. you don't happen to have you Signal Stalker on do you ? I agree it's intermod...
Good luck and Go GRE :-))
__________________
Pro-106,107,164,97,96,95,92,PSR-800,R3
Pro-197,2055,2067,2052,BCD996XT,HP1E
RS DX-396, Grundig YB-400PE, S-350 DL
RS 20-32,20-43,20-73 ST2,20-176,20-283's
Reply With Quote
  #17 (permalink)  
Old 09-15-2008, 3:03 PM
Member
   
Join Date: Mar 2008
Location: Saratoga
Posts: 1,654
Default

Quote:
Originally Posted by Michael-SATX View Post
I'd say replace that cordless phones with a DSS or DECT 6.0 model. Also, if your Pro-433 is within 90-days ... I would go back to RS and exchange it for AT LEAST a Pro-2055 with alpha-text tags :-))
The Pro-433 was just another feature-less flop that seemed to go on clearence as soon as it launched !
Ah heck, some might even consider either the Pro-2096 or Pro-96 models that just recently dropped down to $379 ... or hope for exchange purposes that the Pro-106 "hurries-up" getting to the shelves ?
Say while scanning .. you don't happen to have you Signal Stalker on do you ? I agree it's intermod...
Good luck and Go GRE :-))
i would say that since this thread is about a year old and the DECT phones came out big earlier this year that he probably has one
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 1:04 PM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2011 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions