Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA
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I am hoping to hear from anyone who has taken street level ambient /Background RF readings in San Francisco, Oakland /Berkeley.
My Tes-92 is reading between 600 to 2000 µW/m2 on various street locations in SF,OAK/BKY, while my Cornet meter is reading between 15 to 60 µW/m2 at the same respective locations. I am very curious to know whether readings from your meter(s) are closer to my Tes-92 or Cornet. I just don't know which of my 2 meters are closer to the truth. The Tes-92 itself specifies that at 500 Mhz, it would over-state measurements greatly. But would there be such a large amount of 500MHz RF's at street level? I wonder. Also, I got a constant 4000 µW/m2 reading when near a fire station. I wonder why. I don't think they use 500 Mhz, and even if they do, the signal shouldn't be so constant, right? There should be RF only when they are actively talking, which shouldn't be all the time. Comments from anyone having any insight on any of the above would be appreciated. Thanks, Ann |
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I have a test report of the TES92.
It states *Totally misleading results*. Over the frequency range, the values go up and down several times. Greetings, Charles Claessens member Verband Baubiologie www.milieuziektes.nl www.milieuziektes.be www.hetbitje.nl checked by Norton ----- Original Message ----- From: knowemf To: [hidden email] Sent: Wednesday, June 29, 2011 9:20 AM Subject: [eSens] Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA I am hoping to hear from anyone who has taken street level ambient /Background RF readings in San Francisco, Oakland /Berkeley. My Tes-92 is reading between 600 to 2000 µW/m2 on various street locations in SF,OAK/BKY, while my Cornet meter is reading between 15 to 60 µW/m2 at the same respective locations. I am very curious to know whether readings from your meter(s) are closer to my Tes-92 or Cornet. I just don't know which of my 2 meters are closer to the truth. The Tes-92 itself specifies that at 500 Mhz, it would over-state measurements greatly. But would there be such a large amount of 500MHz RF's at street level? I wonder. Also, I got a constant 4000 µW/m2 reading when near a fire station. I wonder why. I don't think they use 500 Mhz, and even if they do, the signal shouldn't be so constant, right? There should be RF only when they are actively talking, which shouldn't be all the time. Comments from anyone having any insight on any of the above would be appreciated. Thanks, Ann ------------------------------------ Yahoo! Groups Links [Non-text portions of this message have been removed] |
Re: Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA
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In reply to this post by knowemf
Did you check your Yahoo mail? I wrote to you there, did it go through?
--- In [hidden email], "knowemf" <knowemf@...> wrote: > > I am hoping to hear from anyone who has taken street level ambient /Background RF readings in San Francisco, Oakland /Berkeley. > > My Tes-92 is reading between 600 to 2000 �W/m2 on various street locations in SF,OAK/BKY, while my Cornet meter is reading between 15 to 60 �W/m2 at the same respective locations. > > I am very curious to know whether readings from your meter(s) are closer to my Tes-92 or Cornet. I just don't know which of my 2 meters are closer to the truth. > > The Tes-92 itself specifies that at 500 Mhz, it would over-state measurements greatly. But would there be such a large amount of 500MHz RF's at street level? I wonder. > > Also, I got a constant 4000 �W/m2 reading when near a fire station. I wonder why. I don't think they use 500 Mhz, and even if they do, the signal shouldn't be so constant, right? There should be RF only when they are actively talking, which shouldn't be all the time. > > Comments from anyone having any insight on any of the above would be appreciated. > > Thanks, > Ann > |
RE: Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA
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In reply to this post by charles-4
It's possible that "fire stations" have some kind of cordless base- from something like walkie talkies....the base would pulse/ transmit constantly. The newer cordless phones and the walkie talkies are very similiar as far as the base goes..and those base's where the handsets are charged are extremely powerful. They have been compared to a mini cell tower! Lizzie To: [hidden email] From: [hidden email] Date: Wed, 29 Jun 2011 09:32:44 +0200 Subject: Re: [eSens] Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA I have a test report of the TES92. It states *Totally misleading results*. Over the frequency range, the values go up and down several times. Greetings, Charles Claessens member Verband Baubiologie www.milieuziektes.nl www.milieuziektes.be www.hetbitje.nl checked by Norton ----- Original Message ----- From: knowemf To: [hidden email] Sent: Wednesday, June 29, 2011 9:20 AM Subject: [eSens] Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA I am hoping to hear from anyone who has taken street level ambient /Background RF readings in San Francisco, Oakland /Berkeley. My Tes-92 is reading between 600 to 2000 µW/m2 on various street locations in SF,OAK/BKY, while my Cornet meter is reading between 15 to 60 µW/m2 at the same respective locations. I am very curious to know whether readings from your meter(s) are closer to my Tes-92 or Cornet. I just don't know which of my 2 meters are closer to the truth. The Tes-92 itself specifies that at 500 Mhz, it would over-state measurements greatly. But would there be such a large amount of 500MHz RF's at street level? I wonder. Also, I got a constant 4000 µW/m2 reading when near a fire station. I wonder why. I don't think they use 500 Mhz, and even if they do, the signal shouldn't be so constant, right? There should be RF only when they are actively talking, which shouldn't be all the time. Comments from anyone having any insight on any of the above would be appreciated. Thanks, Ann ------------------------------------ Yahoo! Groups Links [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/eSens/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/eSens/join (Yahoo! ID required) <*> To change settings via email: [hidden email] [hidden email] <*> To unsubscribe from this group, send an email to: [hidden email] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/ |
Re: Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA
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In reply to this post by knowemf
Hi Ann,
knowemf wrote: > Also, I got a constant 4000 µW/m2 reading when near a fire station. I wonder why. Police and fire do use the 450-460 Mhz public frequencies. I have a thick paper book listing what frequencies are used by which departments for use by scanners. > the signal shouldn't be so constant, right? There should be RF only when they are actively talking, which shouldn't be all the time. > No, it shouldn't be constant, UNLESS it is the staffing headquarters for Dispatch. Then it would be near constant radio traffic. Stewart |
Re: Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA
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In reply to this post by knowemf
Remember that Cornet instrument is 1-axis. TES92 is 3 axis.
One axis meter only "looks" in one direction, 3-axis meter picks up form all directions, so it will always read higher when there are multiple signals. Also note that digital signals are tricky to measure as the timing of pulse peaks to quiet periods can vary widely. Different meters will report the result differently, even if the peak "strength" is the same. Sometimes very differently. Add to that, when multiple digital signals are present, the peaks will not be aligned. So they don't add up linearly. To the meter, it will look like one signal with more frequent pulses. NOT the same number of pulses, just stronger. This adds additional error. Emil ----- Original Message ----- From: "knowemf" <[hidden email]> To: <[hidden email]> Sent: Wednesday, June 29, 2011 3:20 AM Subject: [eSens] Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA I am hoping to hear from anyone who has taken street level ambient /Background RF readings in San Francisco, Oakland /Berkeley. My Tes-92 is reading between 600 to 2000 µW/m2 on various street locations in SF,OAK/BKY, while my Cornet meter is reading between 15 to 60 µW/m2 at the same respective locations. I am very curious to know whether readings from your meter(s) are closer to my Tes-92 or Cornet. I just don't know which of my 2 meters are closer to the truth. The Tes-92 itself specifies that at 500 Mhz, it would over-state measurements greatly. But would there be such a large amount of 500MHz RF's at street level? I wonder. Also, I got a constant 4000 µW/m2 reading when near a fire station. I wonder why. I don't think they use 500 Mhz, and even if they do, the signal shouldn't be so constant, right? There should be RF only when they are actively talking, which shouldn't be all the time. Comments from anyone having any insight on any of the above would be appreciated. Thanks, Ann ------------------------------------ Yahoo! Groups Links |
Re: Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA
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Tetra is in the 400+ range which will be broadcasting from the firestation.
--- On Wed, 29/6/11, Emil at Less EMF Inc <[hidden email]> wrote: From: Emil at Less EMF Inc <[hidden email]> Subject: Re: [eSens] Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA To: [hidden email] Date: Wednesday, 29 June, 2011, 14:51 Remember that Cornet instrument is 1-axis. TES92 is 3 axis. One axis meter only "looks" in one direction, 3-axis meter picks up form all directions, so it will always read higher when there are multiple signals. Also note that digital signals are tricky to measure as the timing of pulse peaks to quiet periods can vary widely. Different meters will report the result differently, even if the peak "strength" is the same. Sometimes very differently. Add to that, when multiple digital signals are present, the peaks will not be aligned. So they don't add up linearly. To the meter, it will look like one signal with more frequent pulses. NOT the same number of pulses, just stronger. This adds additional error. Emil ----- Original Message ----- From: "knowemf" <[hidden email]> To: <[hidden email]> Sent: Wednesday, June 29, 2011 3:20 AM Subject: [eSens] Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA I am hoping to hear from anyone who has taken street level ambient /Background RF readings in San Francisco, Oakland /Berkeley. My Tes-92 is reading between 600 to 2000 µW/m2 on various street locations in SF,OAK/BKY, while my Cornet meter is reading between 15 to 60 µW/m2 at the same respective locations. I am very curious to know whether readings from your meter(s) are closer to my Tes-92 or Cornet. I just don't know which of my 2 meters are closer to the truth. The Tes-92 itself specifies that at 500 Mhz, it would over-state measurements greatly. But would there be such a large amount of 500MHz RF's at street level? I wonder. Also, I got a constant 4000 µW/m2 reading when near a fire station. I wonder why. I don't think they use 500 Mhz, and even if they do, the signal shouldn't be so constant, right? There should be RF only when they are actively talking, which shouldn't be all the time. Comments from anyone having any insight on any of the above would be appreciated. Thanks, Ann ------------------------------------ Yahoo! Groups Links [Non-text portions of this message have been removed] |
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In reply to this post by charles-4
Charles:
Many thanks. I would be most grateful if there is any way you can provide a link to that test report on the Tes-92 which mentioned. thanks again, Ann --- In [hidden email], "charles" <charles@...> wrote: > > I have a test report of the TES92. > It states *Totally misleading results*. > > Over the frequency range, the values go up and down several times. > > Greetings, > Charles Claessens > member Verband Baubiologie > www.milieuziektes.nl > www.milieuziektes.be > www.hetbitje.nl > checked by Norton > > > > ----- Original Message ----- > From: knowemf > To: [hidden email] > Sent: Wednesday, June 29, 2011 9:20 AM > Subject: [eSens] Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA > > > I am hoping to hear from anyone who has taken street level ambient /Background RF readings in San Francisco, Oakland /Berkeley. > > My Tes-92 is reading between 600 to 2000 µW/m2 on various street locations in SF,OAK/BKY, while my Cornet meter is reading between 15 to 60 µW/m2 at the same respective locations. > > I am very curious to know whether readings from your meter(s) are closer to my Tes-92 or Cornet. I just don't know which of my 2 meters are closer to the truth. > > The Tes-92 itself specifies that at 500 Mhz, it would over-state measurements greatly. But would there be such a large amount of 500MHz RF's at street level? I wonder. > > Also, I got a constant 4000 µW/m2 reading when near a fire station. I wonder why. I don't think they use 500 Mhz, and even if they do, the signal shouldn't be so constant, right? There should be RF only when they are actively talking, which shouldn't be all the time. > > Comments from anyone having any insight on any of the above would be appreciated. > > Thanks, > Ann > > > > ------------------------------------ > > Yahoo! Groups Links > > > > > > [Non-text portions of this message have been removed] > |
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I did sent it to you.
Greetings, Charles Claessens member Verband Baubiologie www.milieuziektes.nl www.milieuziektes.be www.hetbitje.nl checked by Norton ----- Original Message ----- From: knowemf To: [hidden email] Sent: Thursday, June 30, 2011 9:34 AM Subject: [eSens] Re: Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA Charles: Many thanks. I would be most grateful if there is any way you can provide a link to that test report on the Tes-92 which mentioned. thanks again, Ann --- In [hidden email], "charles" <charles@...> wrote: > > I have a test report of the TES92. > It states *Totally misleading results*. > > Over the frequency range, the values go up and down several times. > > Greetings, > Charles Claessens > member Verband Baubiologie > www.milieuziektes.nl > www.milieuziektes.be > www.hetbitje.nl > checked by Norton > > > > ----- Original Message ----- > From: knowemf > To: [hidden email] > Sent: Wednesday, June 29, 2011 9:20 AM > Subject: [eSens] Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA > > > I am hoping to hear from anyone who has taken street level ambient /Background RF readings in San Francisco, Oakland /Berkeley. > > My Tes-92 is reading between 600 to 2000 µW/m2 on various street locations in SF,OAK/BKY, while my Cornet meter is reading between 15 to 60 µW/m2 at the same respective locations. > > I am very curious to know whether readings from your meter(s) are closer to my Tes-92 or Cornet. I just don't know which of my 2 meters are closer to the truth. > > The Tes-92 itself specifies that at 500 Mhz, it would over-state measurements greatly. But would there be such a large amount of 500MHz RF's at street level? I wonder. > > Also, I got a constant 4000 µW/m2 reading when near a fire station. I wonder why. I don't think they use 500 Mhz, and even if they do, the signal shouldn't be so constant, right? There should be RF only when they are actively talking, which shouldn't be all the time. > > Comments from anyone having any insight on any of the above would be appreciated. > > Thanks, > Ann > > > > ------------------------------------ > > Yahoo! Groups Links > > > > > > [Non-text portions of this message have been removed] > ------------------------------------ Yahoo! Groups Links [Non-text portions of this message have been removed] |
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Dear Charles:
Thank you VERY MUCH!! That is exactly the report I was hoping to find somewhere. It all makes sense now. The measurement difference between the Tes-92 and Cornet is large but not immerse when tested against a 900 MHz phone, ie, when no other signals can be present. But in most locations where there can be multiple frequencies, the Tes-92 is reading 600 µW/m2 when the Cornet is reading 30µW/m2. As that report indicates, the Tes-92 is indeed very inaccurate at most frequencies. That said, even the Cornet is registering a huge amount near the fire station. I can see a mast on the station's roof. There are cells that look just like a typically telco cells - those rectangular white blocks. Now, if there is a only a similar report on the Cornet . . . In any event, thank you very much again! Ann --- In [hidden email], "charles" <charles@...> wrote: > > I did sent it to you. > > Greetings, > Charles Claessens > member Verband Baubiologie > www.milieuziektes.nl > www.milieuziektes.be > www.hetbitje.nl > checked by Norton > > ----- Original Message ----- > From: knowemf > To: [hidden email] > Sent: Thursday, June 30, 2011 9:34 AM > Subject: [eSens] Re: Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA > > > Charles: > > Many thanks. I would be most grateful if there is any way you can provide a link to that test report on the Tes-92 which mentioned. > > thanks again, > Ann > > --- In [hidden email], "charles" <charles@> wrote: > > > > I have a test report of the TES92. > > It states *Totally misleading results*. > > > > Over the frequency range, the values go up and down several times. > > > > Greetings, > > Charles Claessens > > member Verband Baubiologie > > www.milieuziektes.nl > > www.milieuziektes.be > > www.hetbitje.nl > > checked by Norton > > > > > > > > ----- Original Message ----- > > From: knowemf > > To: [hidden email] > > Sent: Wednesday, June 29, 2011 9:20 AM > > Subject: [eSens] Ambient /Background RF level in San Francisco, Oakland /Berkeley, CA > > > > > > I am hoping to hear from anyone who has taken street level ambient /Background RF readings in San Francisco, Oakland /Berkeley. > > > > My Tes-92 is reading between 600 to 2000 µW/m2 on various street locations in SF,OAK/BKY, while my Cornet meter is reading between 15 to 60 µW/m2 at the same respective locations. > > > > I am very curious to know whether readings from your meter(s) are closer to my Tes-92 or Cornet. I just don't know which of my 2 meters are closer to the truth. > > > > The Tes-92 itself specifies that at 500 Mhz, it would over-state measurements greatly. But would there be such a large amount of 500MHz RF's at street level? I wonder. > > > > Also, I got a constant 4000 µW/m2 reading when near a fire station. I wonder why. I don't think they use 500 Mhz, and even if they do, the signal shouldn't be so constant, right? There should be RF only when they are actively talking, which shouldn't be all the time. > > > > Comments from anyone having any insight on any of the above would be appreciated. > > > > Thanks, > > Ann > > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > > > > > > > [Non-text portions of this message have been removed] > > > > > > > ------------------------------------ > > Yahoo! Groups Links > > > > > > [Non-text portions of this message have been removed] > |
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