Re: Extreme RF Noise source locating

[RTS <gafa@xxxxxxx>]

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