[Elecraft] Quiet Ductless HVAC System

[Dave Cole]

Hi Hank,

Happy to hear this!  As a group, ALL Amateur Operators, need to push 
this issue with the install of any major appliance...

You may not get any satisfaction, but some will, it is a statistical 
game...  If enough manufactures here about RFI issues, they may start to 
think it is harming sales, then they may well start dealing with this on 
a proactive basis, as opposed to the reactive basis now in place.

I am pretty sure some Solar Companies are already doing this, as I got a 
cold call from one a few years ago in the Oregon area wanting me to come 
out to their assembly plant and look over a few of their systems they 
had set up for RFI testing!

We IDed a number of RFI issues.  I brought a boat load of ferrite 
material with me, and was able to quiet down most of the RFI issues.

They took notes on the material I used, and what I did to quiet things 
down.  I assume they either add them proactively, or add them as 
needed...  Whatever, the outcome was positive RFI wise.

I also pointed them at Mike G, and Ed H., at the ARRL labs, and I assume 
some discussions went on there as well.

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 9:53 AM, Hank wrote:
> 
> Same here when we replaced a package heat pump for the whole house.  Made it part of the deal.
> Contractor was fine with it - said more and more people are concerned with RFI  due to abundant wi-fi networks and HDTV antennas being popular for cord cutters.
> Hank
> K4HYJ
> 
> ----- Original Message -----
> From: Dave Cole (dave at nk7z.net)
> Date: 05/27/20 12:40
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Quiet Ductless HVAC System
> 
> 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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