[Elecraft] Quiet Ductless HVAC System

[Dave Cole]

Maybe they are more hungry out here in Oregon...  They agreed and, (to 
my great surprise), put it in the contract.

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 9:14 AM, Gary wrote:
> 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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