[Elecraft] Quiet Ductless HVAC System

[Dave Cole]

Hi Albert,

Here are a few suggestions...  When I added my furnace, I made it part 
of the purchase contract that there was to be no new RFI.  This makes 
the vendor very careful.  Tell them it is a showstopper, and they will 
be responsible for RFI removal if RFI comes with the new purchase.  Get 
it in writing if possible.

Insist they call the manuafacturer and ask about RFI for the unit you 
are considering, and are there RFI kits for that unit, PRIOR to your 
purchase...

Be careful assuming brand and model numbers will remain RFI quiet over 
time.  Vendors change parts, and circuits, within a fixed model number 
all the time...  What is RFI quiet today, may not be RFI quiet tomorrow...

Take measurements first, before the install, and after install.  Use 
this process:

https://www.nk7z.net/sdr-rfi-survey-p1/

It is part I of III in a series on using an SDR to model your RFI 
environment.  Perform the tests, save the results, then run them all 
again after install...  I run a full sweep once a year here, and keep 
the results...  Also see my March 2020 article in CQ on this subject...

Good luck, and good for you for looking at this early!!!

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

On 5/27/20 4:09 AM, Albert Reynolds wrote:
> Does anyone have suggestions for an RF quiet ductless, also  called a "mini
> split" heat pump system. I am in need of a small (12000 BTU) system for the
> ham shack. Comments from anyone who has used such a system, or successfully
> mitigated RFI on a system would be appreciated. Brand and model number would
> be highly appreciated.
> 
>   
> 
> Albert, N4AGG
> 
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