Extreme RF Noise source locating

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Hey guys,

Yesterday I was setting up some wireless window sensors and
was having trouble after learning them in, could not get proper
response unless I was very close to the receiver.  My thoughts
were that I may have had a bad receiver, so I ordered another.

Today I got a call from the customer asking if anything I did
would have effected the garage door remotes.  He further explained
that the remotes would only work when it was within 2 feet of the
actual opener.  I said there is NO corelation but, just to be sure
I had him power down the system by removing AC/DC so it was not powered.

There was no change in the remotes to open the OH door from a distance.
I suggested he relearn the remotes into the opener and or call
the manufacture of the opener.  (Linear LD050)  He called back
and said he was told by Mfg. that there was a large RF Noise
source locally and he would need a Spectrum Analyzer to determine
where it was located.

Since then he has determined that a next door neighbor has the same
problem with his remotes.  Also, another close neighbor had just left
for two weeks to Europe yesterday.  And that another 3 houses away,
the remotes worked just fine.

Suspicion is that the vacationing neighbor turned on something upon
leaving that is causing this RF Dead Zone.

The reason I am posting here is to ask if anyone else has experienced
this kind of issue??  And/or what household device could there be
that would create this problem??

Or does anyone have any hints how to find something that is putting
out invisible STUFF??  It would be a lot easier if it would if it
emitted a green ooze.

Thanks for any input!!

Les




Re: Extreme RF Noise source locating


Pick a blank spot on the dial and run the volume way up and walk around  
the area..



or

list the freg's of the effected receivers and see what their harmonics are

that would then give you an idea what might be causing the over lap..


*Rocky T. Squirrel, esq.

*

On 9/25/2018 3:52 PM, ABLE1 wrote:
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Re: Extreme RF Noise source locating
Thanks Rocky,

The suggestion of a "old fashion AM portable radio" might go well if I  
had one.  I suggested the same thing to the customer and his response  
was, "can I use the one in my car??"    Well NO...................

Can't remember the last time I listened to AM..............
Whoa!!  WBZ in Boston late in the evening or KYW 1060 in Philadelphia

Please explain further your comment about:
------------------------------------------------------------------------
"list the freq's of the effected receivers and see what their harmonics  
are that would then give you an idea what might be causing the over lap..
------------------------------------------------------------------------
The freq of the window transmitters are 319.5mHz  Don't know the opener
freq (can't find it on setup sheet)

How do I find the harmonics??


Thanks!!

Les





On 9/25/2018 6:27 PM, RTS wrote:

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Re: Extreme RF Noise source locating
Just found that the Opener Remotes works on 318mHz
So they are in the same basic range.
Don't know much about harmonics but it has to be close.




On 9/25/2018 7:13 PM, ABLE1 wrote:
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Re: Extreme RF Noise source locating
1st is a def of harmonics

https://www.empowerrf.com/rf-amplifiers/index.php?topic=harmonics

2nd is a calculator for harmonics

https://www.rfwireless-world.com/calculators/RF-Harmonics-Calculator.html

(also further down the page calculators for other items..)

Some of the harmonics I noticed might indicate something dealing with a  
cell system

maybe a booster or some type for cell transmitter (alarm cell unit ?)


*Rocky T. Squirrel, esq.

*

On 9/25/2018 6:24 PM, ABLE1 wrote:
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Re: Extreme RF Noise source locating


with that in mind you could have a MUR 152-158 mhz radio in the area  
causing the problem..

(they also make intercom's in that freq range..)

or even am FM station ie.. 102-103 mhz which could harmonic up in your  
range..



*Rocky T. Squirrel, esq.*

On 9/25/2018 6:55 PM, RTS wrote:
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Re: Extreme RF Noise source locating
Rocky,

At this point it seems to be a rather small area that is affected.
At least 3-4 houses that are close together.

I did find a old AM/FM/Weather radio that hasn't been used (by me)
in maybe 30++ years.  I can't get anything at my location on AM
but do get a couple of stations on FM.  I will take it along tomorrow
and give it a shot.  Never know.

Thanks for the hints.

Bob, your mother would be proud to know that you remembered. :-)

Les






On 9/25/2018 8:14 PM, RTS wrote:

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Re: Extreme RF Noise source locating

to narrow it even more..

providing it's within the bands covered by the scanner...

We've had problems with R-R walkie talkies, electrical timers, electric  
dog fences, light dimmers

line carrier intercoms, (if the effected homes share the same power  
transformer you might look into that)



*Rocky T. Squirrel, esq.
*

On 9/25/2018 10:21 PM, ABLE1 wrote:
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Re: Extreme RF Noise source locating

On 9/25/2018 4:13 PM, ABLE1 wrote:
 > Thanks Rocky,
 >
 > The suggestion of a "old fashion AM portable radio" might go well if  
I had one.  I suggested the same thing to the customer and his response  
was, "can I use the one in my car??"    Well NO...................

Well, maybe.  When I worked for Arizona telephone company sometimes  
noisy insulators on the electrical mains would cause noise on our  
carrier systems.  We would drive a service truck along the power line  
with the radio between stations and listen for an increase in the static  
volume level.  The power company had a fancy RF communications van to do  
the same thing.


 >
 > Can't remember the last time I listened to AM..............
 > Whoa!!  WBZ in Boston late in the evening or KYW 1060 in Philadelphia

"The Mighty 690" used to broadcast the top 40 on Sunday mornings.  Only  
time my mom would let me drive her car was going to church on Sunday.  
LOL.  I was kinda glad it was a 30 minute drive each way.


Re: Extreme RF Noise source locating
On 9/25/2018 4:52 PM, ABLE1 wrote:
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Customer called this morning and said that his remotes now work ok.
Don't know and will never know what caused the problem for two days.

Life goes on..............................



Re: Extreme RF Noise source locating
On Wednesday, September 26, 2018 at 7:26:41 PM UTC-4, ABLE1 wrote:
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.

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eft

,
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Uhhhhh ?.. have there been any UFO sightings in the area.  

Any kids riding bicycles in the sky?

ET go hommmme!!!!!

Re: Extreme RF Noise source locating
On 9/26/2018 8:42 PM, Jim Davis wrote:
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Hi Jim,

No I don't think so, but I have noticed that there may be a slight
shift in the rotation of the earth, or was that a magnetic field pulse.

Needless to say this may be one for the books but I doubt I will
have time to write it.

My only hope is whatever it was is now turned off for good.

Les

Re: Extreme RF Noise source locating
DHS noticed the leaky bug they had planted and replaced it with a clean  
one..

(((LOL)))


*Rocky T. Squirrel, esq.

*

On 9/26/2018 9:15 PM, ABLE1 wrote:
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Re: Extreme RF Noise source locating
Hi Les,  

Well, there is only one sure way to find out if it's the "Vacationers Home"
. Just pull their meter can out, and when the backup batteries have died, a
nd you now have 'Wireless Peace' in the neighborhood, you hit a winner!

Guaranteed success.

Then, when the vacationing neighbor gets back from vacation, find 2 or 3 ol
d microwaves at the junk yard, and bypass the closed door safety switch. Ai
m those puppies at the house, and when nothing works at the neighbor's hous
e, he will be calling up all kinds of folks to figure it out. After a while
 he will get very paranoid and after a little while longer, a 'For Sale' si
gn will go up... peace will then reign in the neighborhood again. Now, if h
e starts looking really tanned, and it's actually cold outside and overcast
, turn down the settings on the microwaves to Low, or leave some SPF cream  
at his door step.

Well, it's a nice thought anyway. It gets straight to the heart of the prob
lem.

Disclaimer: No, this is humor for those who are just looking in, and might  
want to report me to the authorities. Do not try this at home or at anyone  
else's home, just humor.  

...and now seriously, if there is that much interference for that great an  
area, it is not usually because of everyday items that can be bought by a h
omeowner. I only know of one customer who had an old 'Ademco' wireless syst
em that was affected by his new garage opener. And that is within the realm
 of 'close encounters of a wireless kind'. To reach out across multiple hou
ses, would be something like the 'power transformer sharing' mentioned by R
TS. Also, not always thought of, high intensity heat lamps for "Greenhouses
" aka 'CovertWeedFarming' can be a major cause. Those absolutely will disru
pt even internet communications in a neighborhood enough to cause the "Cabl
e Police" to investigate.

I don't think that I would try to find out the frequency as much as I would
 want to just find the 'high intensity wave source'. I do use a bulb-type m
eter that indicates how much power in being put out and it is tri-axis dire
ctional. Though, I don't know if I would go thru a neighborhood aiming that
 device at homes...I would be rounded up pretty fast by the nut police.

The serious problem with your dilemma is that even if you find out it is su
ch and such neighbor, he or she will probably think that you are crazy. And
, even if they believe you, they are most probably not going to change anyt
hing in their house for anyone. Back to square one.

I am sure that you are using your own security brand that you like and are  
familiar with, but perhaps, just perhaps, trying out a different brand  for
 this customer, using a different wireless frequency could have some benefi
cial effects. Obviously, you have a serious problem in that the wireless de
vices are not communicating and therefore, no reliable security.  

In regards to the possibility of a cellular-phone home amplifier that can b
e fitted on a roof, and wired down to a ceiling to an internal antenna, tha
t kind of device would not cause interference to other homes because of its
 power intensity. If that was true, anyone within close range of any cellul
ar tower would always have serious interference.  

...mm, maybe just maybe, there is the possibility of some old-bat living in
 the neighborhood who was drying her hair in her sixties-era dryer that sho
rt-circuited,... and she's now lit up like a Blazing Christmas Tree... the  
vacationer's mother-in-law?

Enjoy.


Re: Extreme RF Noise source locating
Hello E D,

Some funny stuff you write!!

You may have missed my last transmission that as of yesterday
morning the problem just went away.  Therefore at this time
it is impossible to even search for.

There was mention of a possible "new street light" blasting
out some nasty crap.  One was install just across the street
a week ago.   Also a possible cable company leak somewhere
very local.

Again if it is no longer there it can't be located.

My only hope is that it does not return.

Thanks for the extra input.

Les




On 9/27/2018 1:13 AM, E D wrote:
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