[Elecraft] Quiet Ductless HVAC System

[Gary]

How did you find one that would agree to that? The 6 I've talked with all said pass as soon as I brought the subject up....

73,
Gary kk0sd

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Dave Cole
Sent: Wednesday, May 27, 2020 8:45 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Quiet Ductless HVAC System

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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