Re: Extreme RF Noise source locating

[RTS <gafa@xxxxxxx>]

if you have or can get a "channel learning scanner",  you might be able
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:
> 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:
>> also  you can do a lower freq. to get a harmonic on your device freq..
>>
>> 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:
>>> 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:
>>>> 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:
>>>>> 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??"Â Â Â  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:
>>>>>> if its a high power source  you might try an old fashion  AM
>>>>>> portable radio
>>>>>>
>>>>>> Pick a blank spot on the dial and run the volume way up and walk
>>>>>> around the area..
>>>>>>
>>>>>> If you get a buzzing noise  you may have found your source..
>>>>>>
>>>>>> 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:
>>>>>>> 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
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>