[RFI] Finally located my RFI

[Dave (NK7Z)]

Hi David (W0LEV),

Thanks for the suggestions... I will use some mix43 FT-240 cores to 
start with...  I wish it were my AC unit, then it would be simpler...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 6/19/24 18:59, Dave (NK7Z) wrote:
> That's the plan...  Have you had this issue before, and how effective is 
> that approach?  I have never dealt with an air handler before...
> 
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist, RFI
> ARRL Asst. Director, NW Division, Technical Resources
> 
> On 6/19/24 18:08, David Eckhardt wrote:
>> Dave, install ferrites on BOTH the input AND output.
>>
>> Dave - WØLEV
>>
>> On Wed, Jun 19, 2024 at 6:50 PM Dave (NK7Z) <dave at nk7z.net 
>> <mailto:dave at nk7z.net>> wrote:
>>
>>     Howdy,
>>
>>     I have been chasing an RFI source that comes on and goes off on 
>> about a
>>     7 minute cycle for 3 months now, I have suspected it was HVAC
>>     related by
>>     it's behavior... and timings of changes I have seen...  Runs 
>> different
>>     at night, if an abrupt temp change occurs, a corresponding change in
>>     the
>>     cycle times, and lengths...
>>
>>     It consists of broadband noise from 17 MHz, to 29 MHz.  Worst at 24
>>     MHz,
>>     not bad on 28 and 17 Mhz.  It did not do this when it was 
>> installed, it
>>     has recently changed...  He has had a lot of electrical work of 
>> late as
>>     well.
>>
>>     Anyway, my neighbor had his vents cleaned, and let me know in
>>     advance...
>>        I started my S Meter logger last night, and ran it all night, and
>>     this
>>     morning...  Seven Minutes after the HVAC people arrived, the RFI
>>     ended...  I asked the tech about this, and he said he had just 
>> shut off
>>     the units...  BINGO!!!!!!!!!!!!!!!!  I asked him to text me as he
>>     brought up each unit...  He did, and I now know what unit it is 
>> causing
>>     the issue...
>>
>>     He also indicated they were having issues with the Mitsubishi 
>> inverter
>>     unit getting into people's LED lights, and cycling them...  Sounds 
>> like
>>     it is really noisy on the power grid...
>>
>>     Does anyone have any experience or a contact at Mitsubishi, or any
>>     suggestions on mitigation of this?  I may start by having the HVAC
>>     people install some ferrites on the power to the inverter, at the
>>     inverter...  But I want to contact Mitsubishi as well and see if they
>>     have an RFI kit...
>>
>>     The unit model is SUZ-KA12NA, Service Ref: SUZ-KA12NAR1.TH
>>     <http://SUZ-KA12NAR1.TH>
>>
>>     --     73, and thanks,
>>     Dave (NK7Z)
>>     https://www.nk7z.net <https://www.nk7z.net>
>>     ARRL Volunteer Examiner
>>     ARRL Technical Specialist, RFI
>>     ARRL Asst. Director, NW Division, Technical Resources
>>
>>     _______________________________________________
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>>     RFI at contesting.com <mailto:RFI at contesting.com>
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>>     <http://lists.contesting.com/mailman/listinfo/rfi>
>>
>>
>>
>> -- 
>> *Dave - WØLEV
>> *
>>
>>
> 
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