I have two goals in talking RFI to the vendors, and manufacturers...
1. Make both the vendor, and manufacturer aware RFI issues may exist.
This might help the next poor sod down the road, in that the RFI issue
is no longer "new" to either vendor, or maker.
2. Gets RFI on the table in the event there is RFI, I can say, we
talked about this, and you said...
In my case, the vendor called the manufacturer prior to signing a
contract, and the manuafacturer said no issues at all, RFI wise. They
were right. The thing is dead quiet.
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 9:21 AM, Bob McGraw K4TAX wrote:
My take on this is "prepare to do some noise mitigation yourself." Jim,
K9YC, has several good papers dealing with noise reduction and methods
to accomplish same. In general, adding correct type ferrite chokes to
the AC mains and the control lines is, in general, good starting point.
Most HVAC companies are typically not versed in RFI technology and I
wouldn't expect them to be.
73
Bob, K4TAX
On 5/27/2020 11:14 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
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net Please help support this email
list: http://www.qsl.net/donate.html Message delivered to
[email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
