Re: Extreme RF Noise source locating

[RTS <gafa@xxxxxxx>]

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