Tom,
The usual loop antenna design picks up magnetic fields, which tend to be
dominant from SMPS transformers and inductors.
Cheers, Ken
________________
Ken Wyatt
wyattphoto@mac.com
> On Mar 23, 2021, at 1:11 PM, rfi-request@contesting.com wrote:
>
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>
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> Today's Topics:
>
> 1. Re: New Interference at kk0sd (Tom Thompson)
> 2. Re: New Interference at kk0sd (Don Kirk)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 23 Mar 2021 12:27:45 -0600
> From: Tom Thompson <w0ivj@tomthompson.com>
> To: Mike Martin <mike@rfiservices.com>, Gary
> <gary_mayfield@hotmail.com>
> Cc: Rfi List <rfi@contesting.com>
> Subject: Re: [RFI] New Interference at kk0sd
> Message-ID: <fff7cac5-fe47-3b8a-20f1-349436e51149@tomthompson.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> See:? http://tomthompson.com/radio/ReceivingLoop/loop.html? for a tuned
> loop.? You can build one in a couple of hours from your junk box.? This
> type of loop does not work well for power line noise ( a vhf yagi is
> better for that), but it does work well for switch mode RFI.? Since most
> of these noise sources are vertically? polarized, look through the loop
> for the null and along the edge for the peak. When close to the source,
> the polarization may switch.
>
> 73,?? Tom?? W0IVJ
>
> On 3/23/2021 6:32 AM, Mike Martin wrote:
>> Remember in his shack he has a very good radio and a very good antenna which
>> together increased sensitivity and allow him to hear much further away. when
>> he goes outside with a portable and a smaller antenna he doesn't have the
>> sensitivity he had inside there for he may have to travel a lot further
>> before he's able to receive it.
>>
>> ?Be safe,
>> Mike
>>
>> Get BlueMail for Android ?
>>
>> On Mar 22, 2021, 11:37 PM, at 11:37 PM, Gary <gary_mayfield@hotmail.com>
>> wrote:
>>> Kim,
>>>
>>> I hear it on the portable when connected to the vertical antenna, but
>>> will undertake an antenna substitution experiment this weekend.
>>>
>>> Keep the suggestions coming!
>>>
>>> 73 and Thanks,
>>> Gary "Joe", kk0sd
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: RFI <rfi-bounces+gary_mayfield=hotmail.com@contesting.com> On
>>> Behalf Of Kim Elmore
>>> Sent: Monday, March 22, 2021 4:44 PM
>>> To: Don Kirk <wd8dsb@gmail.com>
>>> Cc: Rfi List <rfi@contesting.com>
>>> Subject: Re: [RFI] New Interference at kk0sd
>>>
>>> That?s a great idea, too! I once ran into an interference problem that
>>> was inherent to the antenna, but only under certain conditions. It
>>> didn?t sound like Gary?s but I pulled a lot of hair out fixing that
>>> one. I?m simply suspicious that he hears NOTHING with his portable rx
>>> so I?m after eliminating anything inherent to his station. Standing by
>>> his vertical with his portable rx is a great idea.
>>>
>>> 73,
>>>
>>> Kim N5OP
>>>
>>> "People that make music together cannot be enemies, at least as long as
>>> the music lasts." -- Paul Hindemith
>>>
>>>> On Mar 22, 2021, at 2:24 PM, Don Kirk <wd8dsb@gmail.com> wrote:
>>>>
>>>> ?
>>>> Hi Dave,
>>>>
>>>> I still recommend tuned and untuned loops to folks on an almost daily
>>> basis but they definitely don?t shed as much light on the situation as
>>> a unidirectional antenna does. It would be nice to see what your
>>> shielded untuned loop design is.
>>>> The beauty of the portable flag which is unidirectional is that you
>>> typically can walk right to the source (no guessing which direction the
>>> signal is coming from). I still pack 7 antennas when I go on a RFI
>>> case, and this includes 3 tuned HF loops, but I have found that I
>>> typically don?t use bidirectional loops anymore (unless I?m trying to
>>> be more stealth) as the portable flag saves me an enormous amount of
>>> time. Also in heavily congested areas (like downtown Indianapolis)
>>> having the unidirectional HF antenna is priceless as it unmasks noise
>>> that?s mixing from other sources that are in the opposite direction,
>>> etc. Yesterday I worked on a case (more of a country setting) where I
>>> had 2 different bad poles that were only 0.14 miles apart plus a 3rd
>>> RFI source generating spikes every 1 KHz within the same area and
>>> having the unidirectional HF antenna helped me locate all 3 sources in
>>> a matter of minutes (way under an hour).
>>>> You can never have enough antennas in your direction finding bag of
>>> tricks but after using a unidirectional HF antenna like the portable
>>> flag for direction finding I can?t imagine not using one. It typically
>>> takes me seconds to tell which direction the signal is without the need
>>> of triangulation, etc. Traditional triangulation has almost become a
>>> thing of the past for me.
>>>> I also have been helping a ham that has the MFJ unit (the one with a
>>> beam and the one with a dipole) and while it has helped him, it has an
>>> odd characteristic that makes the meter jump which causes confusion to
>>> him and after looking at the schematic I question how they implemented
>>> AGC in those units. I?m starting to think AGC in a radio direction
>>> finding system is typically not desirable. Manual attenuation is
>>> priceless but I don?t want anything changing gain automatically.
>>>> Just my opinion from tracking down RFI on an almost continuous basis
>>> in addition to my day job.
>>>> Please share details on your shielded untuned loop and thanks.
>>>>
>>>> 73,
>>>> Don wd8dsb
>>>>
>>>>
>>>>
>>>>> On Mon, Mar 22, 2021 at 1:22 PM David Eckhardt
>>> <davearea51a@gmail.com> wrote:
>>>>> We recently found a faulty lightning 'arrestor' on a pole by using
>>>>> both the MFJ device and a small shielded loop (easy home brew
>>>>> project) into a battery-powered receiver. We had two of us in the
>>>>> field. One wielded the MFJ and I had the small (0.5-meter) shielded
>>>>> loop fed into the Yaesu VR-500 on 1.830 MHz (160-meters). We both
>>>>> independently found the same source / pole in the field. The null
>>> on
>>>>> the shielded loop is extremely sharp and this piece of hardware
>>>>> should be in the bag of tricks of anyone sleuthing RFI. It is a
>>>>> powerful tool when coupled to a battery-powered receiver with its
>>>>> extremely sharp null (perpendicular to the plane of the loop). One
>>> doesn't need something as large as the 'Flag" that was recently
>>> published
>>>>> in QST and referred to in a previous post in this thread. Another
>>> plus
>>>>> for the shielded loop is that in the field, one can tune the
>>> receiver
>>>>> to the worst-case frequency of the RFI as I did in the related
>>> story, above.
>>>>> The shielded loop is untuned. The MFJ relies only on VHF noise.
>>> In some
>>>>> cases, an ultrasonic microphone at the focus of a small parabolic or
>>>>> spherical reflector is good at finding coronal discharges as well as
>>>>> active arcs and discharges. MFJ also makes that at a reasonable
>>> price.
>>>>> Our power provider was out the next day to fix the problem. We even
>>>>> gave them the pole number which is a great help to any power
>>> provider.
>>>>> Dave - W?LEV
>>>>>
>>>>> On Mon, Mar 22, 2021 at 2:28 AM Kim Elmore
>>> <cw_de_n5op@sbcglobal.net> wrote:
>>>>>> It's odd that you can't hear it on your portable rx. That made me
>>>>>> curious: What if this is something internal to your '847? Have you
>>>>>> tried pulling your '847 and listening on a different receiver
>>> using
>>>>>> the same antenna? If you have, do you still hear the noise? It's a
>>> long shot, but...
>>>>>> Kim N5OP
>>>>>>
>>>>>> On 3/21/2021 7:28 PM, Gary wrote:
>>>>>>> Mike,
>>>>>>>
>>>>>>> Thanks for the info. I understand locating the
>>>>>>> noise is
>>>>>> more important than identifying the noise. I am just try to play
>>>>>> all the angles as I was hoping to work the WPX contest nest
>>>>>> weekend. I have been walking the neighborhood a good chunk of the
>>>>>> afternoon, and have not been able to hear the noise on my portable
>>>>>> shortwave and loop antenna. It is as strong as ever on my home
>>> station.
>>>>>>> I have an MFJ 852 Noise Finder and it seems to
>>>>>>> go crazy
>>>>>> when broadside to any house. The neighbors on each side of me
>>> drive
>>>>>> the meter full scale.
>>>>>>> Yep I only want to knock on one door, as I know
>>>>>>> that
>>>>>> can get dicey. I would rather place a call to a utility, but can?t
>>>>>> really do either until I know.
>>>>>>> Keep the suggestions coming!
>>>>>>>
>>>>>>> Thanks and 73,
>>>>>>> Gary ?Joe? kk0sd
>>>>>>>
>>>>>>> From: Mike Martin <mike@rfiservices.com>
>>>>>>> Sent: Sunday, March 21, 2021 6:53 PM
>>>>>>> To: Gary <gary_mayfield@hotmail.com>
>>>>>>> Cc: rfi@contesting.com
>>>>>>> Subject: Re: [RFI] New Interference at kk0sd
>>>>>>>
>>>>>>> Joe I haven't had time to read all the other input but I can
>>> tell
>>>>>>> you it
>>>>>> is not an arcing source or a sparking source. either one of the
>>> two
>>>>>> would be much broader than what you're reporting. if someone were
>>>>>> to tell you exactly what it is you really wouldn't be any further
>>>>>> ahead. You would still have to find which residents or business
>>>>>> it's in. My suggestion would be to either go mobile or on foot,
>>>>>> preferably on foot listening to the frequency that you know the
>>>>>> problem affects. once you locate the residents then go through the
>>>>>> breaker scenario and locate what the source is. Be 100% certain of
>>>>>> the structure or home that the problem is in before knocking on
>>> the
>>>>>> door. The last thing you want to do is start guessing. Guessing
>>> we'll ruin the relationship with your neighbors.
>>>>>>> Be safe,
>>>>>>> Mike k3RFI
>>>>>>> www.rfiservices.com<http://www.rfiservices.com>
>>>>>>> Get BlueMail for Android<http://www.bluemail.me/r?b=16696>
>>>>>>> On Mar 21, 2021, at 2:01 PM, Gary
>>> <gary_mayfield@hotmail.com<mailto:
>>>>>> gary_mayfield@hotmail.com>> wrote:
>>>>>>> My last problem was tracked down to a neon sign in a neighbors
>>>>>>> garage. I
>>>>>> had several months of blissful relatively low noise operation, but
>>>>>> now have a new RFI issue.
>>>>>>> You can see a recording of it here:
>>>>>>> https://www.youtube.com/watch?v=GKf4P44FXMo
>>>>>>>
>>>>>>> I have turned all of the breakers in my home off and run the
>>>>>>> radio from
>>>>>> a battery and the noise remains.
>>>>>>> My neighborhood utilities are all underground.
>>>>>>>
>>>>>>> There are no solar installations in my neighborhood, and the
>>>>>>> noise is
>>>>>> there at night anyway...
>>>>>>> The noise is not detectable on the AM broadcast band, but starts
>>>>>>> around
>>>>>> 2 MHz and runs to at least 6 meters.
>>>>>>> It is there 7 days a week 24 hours a day.
>>>>>>>
>>>>>>> It is not detectable from my pickup when I drive the streets of
>>>>>>> my
>>>>>> neighborhood (checking both AM broadcast and Shortwave).
>>>>>>> If any one has heard something like this, I would love to hear
>>>>>>> what you
>>>>>> found.
>>>>>>> Thank You for your input and help!
>>>>>>>
>>>>>>> 73,
>>>>>>> Gary "Joe", kk0sd
>>>>>>>
>>>>>>>
>>>>>>> ________________________________
>>>>>>>
>>>>>>> RFI mailing list
>>>>>>> RFI@contesting.com<mailto:RFI@contesting.com>
>>>>>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>>>>> _______________________________________________
>>>>>>> RFI mailing list
>>>>>>> RFI@contesting.com
>>>>>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>>>> --
>>>>>>
>>>>>> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology,
>>>>>> CCM, PP SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
>>>>>>
>>>>>> /"A great second violinist plays second fiddle to no one." //?
>>> Robert C.
>>>>>> Marsh, Chicago Sun-Times./
>>>>>>
>>>>>> _______________________________________________
>>>>>> RFI mailing list
>>>>>> RFI@contesting.com
>>>>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>>>>
>>>>>
>>>>> --
>>>>> *Dave - W?LEV*
>>>>> *Just Let Darwin Work*
>>>>> _______________________________________________
>>>>> RFI mailing list
>>>>> RFI@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/rfi
>>> _______________________________________________
>>> RFI mailing list
>>> RFI@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>>> _______________________________________________
>>> RFI mailing list
>>> RFI@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>> _______________________________________________
>> RFI mailing list
>> RFI@contesting.com
>> http://lists.contesting.com/mailman/listinfo/rfi
>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 23 Mar 2021 15:11:11 -0400
> From: Don Kirk <wd8dsb@gmail.com>
> To: Mike Martin <mike@rfiservices.com>
> Cc: Gary <gary_mayfield@hotmail.com>, Kim Elmore
> <cw_de_n5op@sbcglobal.net>, Rfi List <rfi@contesting.com>
> Subject: Re: [RFI] New Interference at kk0sd
> Message-ID:
> <CAKtW65d94DMhbd3RW8eP9Q8XaiK9Y5Yr-HOiyz6rD5vqar3vhw@mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi Mike, Gary, and gang,
>
> Well after seeing Garys shielded un-tuned loop, I watched the video on how
> to build that loop. I just built one almost identical to his loop but used
> RG-58 coax since that's what I had on hand. I also spent 10 seconds
> building a simple 1 turn 9 inch loop (no form, just free standing) for
> comparisons which is even smaller than Garys loop, and I can tell you there
> is no comparison. Without doing any impedance matching, the 9 inch
> un-tuned single turn loop I built has a gain that is approximately 23 dB
> greater than Garys loop when tested in the AM broadcast band and it still
> exhibits nice nulls which comes as no surprise. My single turn non
> shielded loop just has about 6 inches of twisted wire (the same wire that
> forms the loop) to form the feedline to it, and then I just used a 3 foot
> piece of 50 ohm coax to connect it to my receiver. I used the same 3 foot
> piece of coax to connect the shielded un-tuned loop to the receiver. While
> my un-tuned 9 inch loop might not be as well balanced (one null might be
> deeper than the opposite null), it makes one fine DF antenna in a pinch.
> Also if Gary needs more gain he can just make the loop I made bigger in
> diameter. It really just takes seconds to make this antenna (much less
> than a minute).
>
> I now fully understand why Gary can't hear his noise, as his un-tuned
> shielded loop has very poor sensitivity based on my trying to copy the
> design. While I normally use preamps with my DF loops, Garys RFI is so
> strong that I'm pretty darn sure he can make a simple one turn loop to
> figure out what possible directions the signal is coming from. Something I
> have done in the past is to use a cardboard box as the antenna form as it
> does not have to be round. Need to figure out what directions the signal
> is coming from before leaving his property if at all possible.
>
> Just my opinion, and I will try and post some comparison videos but they
> will not be pretty as I'm buried in other tasks.
>
> 73,
> Don (wd8dsb)
>
>
>
> On Tue, Mar 23, 2021 at 8:33 AM Mike Martin <mike@rfiservices.com> wrote:
>
>> Remember in his shack he has a very good radio and a very good antenna
>> which together increased sensitivity and allow him to hear much further
>> away. when he goes outside with a portable and a smaller antenna he doesn't
>> have the sensitivity he had inside there for he may have to travel a lot
>> further before he's able to receive it.
>>
>> Be safe,
>> Mike
>>
>> Get BlueMail for Android <http://www.bluemail.me/r?b=16696>
>> On Mar 22, 2021, at 11:37 PM, Gary <gary_mayfield@hotmail.com> wrote:
>>>
>>> Kim,
>>>
>>> I hear it on the portable when connected to the vertical antenna, but will
>>> undertake an antenna substitution experiment this weekend.
>>>
>>> Keep the suggestions coming!
>>>
>>> 73 and Thanks,
>>> Gary "Joe", kk0sd
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: RFI <rfi-bounces+gary_mayfield=hotmail.com@contesting.com> On Behalf
>>> Of Kim Elmore
>>> Sent: Monday, March 22, 2021 4:44 PM
>>> To: Don Kirk <wd8dsb@gmail.com>
>>> Cc: Rfi List <rfi@contesting.com>
>>> Subject: Re: [RFI] New Interference at kk0sd
>>>
>>> That?s a great idea, too! I once ran into an interference problem that was
>>> inherent to the antenna, but only under certain conditions. It didn?t sound
>>> like Gary?s but I pulled a lot of hair out fixing that one. I?m simply
>>> suspicious that he hears NOTHING with his portable rx so I?m after
>>> eliminating anything inherent to his station. Standing by his vertical with
>>> his portable rx is a great idea.
>>>
>>> 73,
>>>
>>> Kim N5OP
>>>
>>> "People that make music together cannot be enemies, at least as long as the
>>> music lasts." -- Paul Hindemith
>>>
>>> On Mar 22, 2021, at 2:24 PM, Don Kirk <wd8dsb@gmail.com> wrote:
>>>>
>>>> ?
>>>> Hi Dave,
>>>>
>>>> I still recommend tuned and untuned loops to folks on an almost daily
>>>> basis but they definitely don?t shed as much light on the situation as a
>>>> unidirectional antenna does. It would be nice to see what your shielded
>>>> untuned loop design is.
>>>>
>>>> The beauty of the portable flag which is unidirectional is that you
>>>> typically can walk right to the source (no guessing which direction the
>>>> signal is coming from). I still pack 7 antennas when I go on a RFI case,
>>>> and this includes 3 tuned HF loops, but I have found that I typically
>>>> don?t use bidirectional loops anymore (unless I?m trying to be more
>>>> stealth) as the portable flag saves me an enormous amount of time. Also
>>>> in heavily congested areas (like downtown Indianapolis) having the
>>>> unidirectional HF antenna is priceless as it unmasks noise that?s mixing
>>>> from other sources that are in the opposite direction, etc. Yesterday I
>>>> worked on a case (more of a country setting) where I had 2 different bad
>>>> poles that were only 0.14 miles apart plus a 3rd RFI source generating
>>>> spikes every 1 KHz within the same area and having the unidirectional HF
>>>> antenna helped me locate all 3 sources in a matter of minutes (way under
>>>> an hour).
>>>>
>>>> You can never have enough antennas in your direction finding bag of tricks
>>>> but after using a unidirectional HF antenna like the portable flag for
>>>> direction finding I can?t imagine not using one. It typically takes me
>>>> seconds to tell which direction the signal is without the need of
>>>> triangulation, etc. Traditional triangulation has almost become a thing
>>>> of the past for me.
>>>>
>>>> I also have been helping a ham that has the MFJ unit (the one with a beam
>>>> and the one with a dipole) and while it has helped him, it has an odd
>>>> characteristic that makes the meter jump which causes confusion to him and
>>>> after looking at the schematic I question how they implemented AGC in
>>>> those units. I?m starting to think AGC in a radio direction finding
>>>> system is typically not desirable. Manual attenuation is priceless but I
>>>> don?t want anything changing gain automatically.
>>>>
>>>> Just my opinion from tracking down RFI on an almost continuous basis in
>>>> addition to my day job.
>>>>
>>>> Please share details on your shielded untuned loop and thanks.
>>>>
>>>> 73,
>>>> Don wd8dsb
>>>>
>>>>
>>>>
>>>> On Mon, Mar 22, 2021 at 1:22 PM David Eckhardt <davearea51a@gmail.com>
>>>> wrote:
>>>>> We recently found a faulty lightning 'arrestor' on a pole by using
>>>>> both the MFJ device and a small shielded loop (easy home brew
>>>>> project) into a battery-powered receiver. We had two of us in the
>>>>> field. One wielded the MFJ and I had the small (0.5-meter) shielded
>>>>> loop fed into the Yaesu VR-500 on 1.830 MHz (160-meters). We both
>>>>> independently found the same source / pole in the field. The null on
>>>>> the shielded loop is extremely sharp and this piece of hardware
>>>>> should be in the bag of tricks of anyone sleuthing RFI. It is a
>>>>> powerful tool when coupled to a battery-powered receiver with its
>>>>> extremely sharp null (perpendicular to the plane of the loop). One
>>>>> doesn't need something as large as the 'Flag" that was recently published
>>>>> in QST and referred to in a previous post in this thread. Another plus
>>>>> for the shielded loop is that in the field, one can tune the receiver
>>>>> to the worst-case frequency of the RFI as I did in the related story,
>>>>> above.
>>>>> The shielded loop is untuned. The MFJ relies only on VHF noise. In some
>>>>> cases, an ultrasonic microphone at the focus of a small parabolic or
>>>>> spherical reflector is good at finding coronal discharges as well as
>>>>> active arcs and discharges. MFJ also makes that at a reasonable price.
>>>>>
>>>>> Our power provider was out the next day to fix the problem. We even
>>>>> gave them the pole number which is a great help to any power provider.
>>>>>
>>>>> Dave - W?LEV
>>>>>
>>>>> On Mon, Mar 22, 2021 at 2:28 AM Kim Elmore <cw_de_n5op@sbcglobal.net>
>>>>> wrote:
>>>>>
>>>>> It's odd that you can't hear it on your portable rx. That made me
>>>>>> curious: What if this is something internal to your '847? Have you
>>>>>> tried pulling your '847 and listening on a different receiver using
>>>>>> the same antenna? If you have, do you still hear the noise? It's a long
>>>>>> shot, but...
>>>>>>
>>>>>> Kim N5OP
>>>>>>
>>>>>> On 3/21/2021 7:28 PM, Gary wrote:
>>>>>>
>>>>>>> Mike,
>>>>>>>
>>>>>>> Thanks for the info. I understand locating the
>>>>>>> noise is
>>>>>>>
>>>>>> more important than identifying the noise. I am just try to play
>>>>>> all the angles as I was hoping to work the WPX contest nest
>>>>>> weekend. I have been walking the neighborhood a good chunk of the
>>>>>> afternoon, and have not been able to hear the noise on my portable
>>>>>> shortwave and loop antenna. It is as strong as ever on my home station.
>>>>>>
>>>>>>>
>>>>>>> I have an MFJ 852 Noise Finder and it seems to
>>>>>>> go crazy
>>>>>>>
>>>>>> when broadside to any house. The neighbors on each side of me drive
>>>>>> the meter full scale.
>>>>>>
>>>>>>>
>>>>>>> Yep I only want to knock on one door, as I know
>>>>>>> that
>>>>>>>
>>>>>> can get dicey. I would rather place a call to a utility, but can?t
>>>>>> really do either until I know.
>>>>>>
>>>>>>>
>>>>>>> Keep the suggestions coming!
>>>>>>>
>>>>>>> Thanks and 73,
>>>>>>> Gary ?Joe? kk0sd
>>>>>>>
>>>>>>> From: Mike Martin <mike@rfiservices.com>
>>>>>>> Sent: Sunday, March 21, 2021 6:53 PM
>>>>>>> To: Gary <gary_mayfield@hotmail.com>
>>>>>>> Cc: rfi@contesting.com
>>>>>>> Subject: Re: [RFI] New Interference at kk0sd
>>>>>>>
>>>>>>> Joe I haven't had time to read all the other input but I can tell
>>>>>>> you it
>>>>>>>
>>>>>> is not an arcing source or a sparking source. either one of the two
>>>>>> would be much broader than what you're reporting. if someone were
>>>>>> to tell you exactly what it is you really wouldn't be any further
>>>>>> ahead. You would still have to find which residents or business
>>>>>> it's in. My suggestion would be to either go mobile or on foot,
>>>>>> preferably on foot listening to the frequency that you know the
>>>>>> problem affects. once you locate the residents then go through the
>>>>>> breaker scenario and locate what the source is. Be 100% certain of
>>>>>> the structure or home that the problem is in before knocking on the
>>>>>> door. The last thing you want to do is start guessing. Guessing we'll
>>>>>> ruin the relationship with your neighbors.
>>>>>>
>>>>>>> Be safe,
>>>>>>> Mike k3RFI
>>>>>>> www.rfiservices.com<http://www.rfiservices.com>
>>>>>>> Get BlueMail for Android<http://www.bluemail.me/r?b=16696>
>>>>>>> On Mar 21, 2021, at 2:01 PM, Gary <gary_mayfield@hotmail.com<mailto:
>>>>>>>
>>>>>> gary_mayfield@hotmail.com>> wrote:
>>>>>>
>>>>>>>
>>>>>>> My last problem was tracked down to a neon sign in a neighbors
>>>>>>> garage. I
>>>>>>>
>>>>>> had several months of blissful relatively low noise operation, but
>>>>>> now have a new RFI issue.
>>>>>>
>>>>>>>
>>>>>>> You can see a recording of it here:
>>>>>>> https://www.youtube.com/watch?v=GKf4P44FXMo
>>>>>>>
>>>>>>> I have turned all of the breakers in my home off and run the
>>>>>>> radio from
>>>>>>>
>>>>>> a battery and the noise remains.
>>>>>>
>>>>>>>
>>>>>>> My neighborhood utilities are all underground.
>>>>>>>
>>>>>>> There are no solar installations in my neighborhood, and the
>>>>>>> noise is
>>>>>>>
>>>>>> there at night anyway...
>>>>>>
>>>>>>>
>>>>>>> The noise is not detectable on the AM broadcast band, but starts
>>>>>>> around
>>>>>>>
>>>>>> 2 MHz and runs to at least 6 meters.
>>>>>>
>>>>>>>
>>>>>>> It is there 7 days a week 24 hours a day.
>>>>>>>
>>>>>>> It is not detectable from my pickup when I drive the streets of
>>>>>>> my
>>>>>>>
>>>>>> neighborhood (checking both AM broadcast and Shortwave).
>>>>>>
>>>>>>>
>>>>>>> If any one has heard something like this, I would love to hear
>>>>>>> what you
>>>>>>>
>>>>>> found.
>>>>>>
>>>>>>>
>>>>>>> Thank You for your input and help!
>>>>>>>
>>>>>>> 73,
>>>>>>> Gary "Joe", kk0sd
>>>>>>>
>>>>>>>
>>>>>>> ------------------------------
>>>>>>>
>>>>>>>
>>>>>>> RFI mailing list
>>>>>>> RFI@contesting.com<mailto:RFI@contesting.com>
>>>>>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>>>>> ------------------------------
>>>>>>>
>>>>>>> RFI mailing list
>>>>>>> RFI@contesting.com
>>>>>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>>>>>
>>>>>> --
>>>>>>
>>>>>> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology,
>>>>>> CCM, PP SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
>>>>>>
>>>>>> /"A great second violinist plays second fiddle to no one." //? Robert C.
>>>>>> Marsh, Chicago Sun-Times./
>>>>>>
>>>>>> ------------------------------
>>>>>>
>>>>>> RFI mailing list
>>>>>> RFI@contesting.com
>>>>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> *Dave - W?LEV*
>>>>> *Just Let Darwin Work*
>>>>> ------------------------------
>>>>>
>>>>> RFI mailing list
>>>>> RFI@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>>>
>>>> ------------------------------
>>>
>>> RFI mailing list
>>> RFI@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>>> ------------------------------
>>>
>>> RFI mailing list
>>> RFI@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
>>>
>>>
>
>
> ------------------------------
>
> Subject: Digest Footer
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> ------------------------------
>
> End of RFI Digest, Vol 218, Issue 27
> ************************************
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