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 ([email protected])
Date: 05/27/20 12:40
To: [email protected]
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: [email protected] <[email protected]> On
Behalf Of Dave Cole
Sent: Wednesday, May 27, 2020 8:45 AM
To: [email protected]
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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