[RFI] Mini-Split for new ham shack

[Dave Cole]

You are on the right track, test, test, test...  Then test more... 
Bring some FT240-31 ferrites with you.  Ask the vendor if you can try 
them out first...

I was able to get the vendor to write in the contract for my heater 
install, that no RFI would be generated!  That surprised me.  Most won't 
do that.

Ask the vendor to contact the manufacture, and ask about an RFI 
suppression kit, is one available, is it free, is there a cost to 
install?  If so, what are the specs for it...

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

On 3/8/21 5:20 PM, David Winarsky wrote:
> 
> 
>> On Mar 8, 2021, at 5:17 PM, Dave Cole <dave at nk7z.net> wrote:
>>
>> Being placed in a "specific mode" more than likely means a nice square wave, just narrower than at full power.
>>
>> I had the fan motor replaced in my HVAC unit with a motor that did not need "Inverter technology".
>>
>> "Inverter Technology", will probably get you "RFI suppressing Technology" in your hamshack...
>>
>> Ask to see one in use, and bring a portable SW radio, and some ferrites...  I had a bit of noise on my setup, three or four ferrites later teh problem was solved, but I opted to not avail myself of the latest in "Inverter Technology".  :)
>>
> 
> Thanks Don, yes I’m trying to find one that doesn’t involve this inverter technology, but it seems all of these mini-splits have moved to this variable speed type design.  If anyone knows or has a suggestion please let me know!
> 
> Maybe I need to look at an old fashioned window unit, although I prefer something more integrated.
> 
> I am definitely planning on snooping around with my portable radio!  I’m testing every single piece of equipment that goes in these days :)
> 
> David
> 
>> 73, and thanks,
>> Dave (NK7Z)
>> https://www.nk7z.net
>> ARRL Volunteer Examiner
>> ARRL Technical Specialist, RFI
>> ARRL Asst. Director, NW Division, Technical Resources
>>
>> On 3/8/21 10:59 AM, Jim Brown wrote:
>>> On 3/8/2021 9:54 AM, David Winarsky wrote:
>>>> It seems to have a variable speed motor with “inverter technology” but the HVAC company says it can be placed in a specific mode (low, med, high) rather than auto where it will stay fixed.
>>> ANY variable speed motor is likely to be a source of nasty RFI.
>>> 73, Jim K9YC
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>