[RFI] Finally located my RFI

[Dave (NK7Z)]

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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> 
> 
> -- 
> *Dave - WØLEV
> *
> 
>