Re: Extreme RF Noise source locating

[ABLE1 <somewhere@xxxxxxxxxxx>]

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
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>