And with that, lets let this thread take a rest for now. :-)
73,
Eric
Mooderator
elecraft.com
_..._
> On May 27, 2020, at 8:19 PM, Dave Cole wrote:
>
> Good, Fast, Cheap... Pick two.
>
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical
Good, Fast, Cheap... Pick two.
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 4:39 PM, Steve via Elecraft wrote:
You must remember that the parts that go in much of this
And one must remember that most folks will spend the least amount of
money necessary to get the HVAC system working or perhaps install a new
system. And most of these folks have no clue about RFI, but are only
concerned if their abode is hot or cold, warm or comfortable.
As a purchasing
You must remember that the parts that go in much of this equipment is
supplied by the lowest bidder. If a component can be left out even if
its only a few pennies it will be left out. I was in the service
business and owned a business for over 25 years doing installations. I
was never asked
You are correct, as usual. My intent in citing motors, et al.
was that MOST of these devices, especially these days, are
monitored/controlled by potentially offending devices.
__
Clay Autery, KY5G
(318) 518-1389
On 05/27/20 17:29, Jim Brown wrote:
On 5/27/2020 3:09 PM,
On 5/27/2020 3:09 PM, Clay Autery wrote:
ANY part of the HVAC system that uses a motor or reciprocating drive
mechanism that runs off AC current.
Not quite. The culprit is most often variable speed controllers for ANY
motor. Systems without such "go fasters" are far less likely to be noisy.
As I understand it ANY part of the HVAC system that uses a motor or
reciprocating drive mechanism that runs off AC current. Anything that
runs off DC current that is sourced from AC current via a switch mode
power supply, any part of the system that has an ECM, et al. electronic
The compressor as well. They aren't necessarily running at 60 Hz (or 50
Hz for those across the pond).
73 -- Lynn
On 5/27/20 10:17 AM, Dave Cole wrote:
Of late, the fans in these systems are speed controlled by PWM. Nice
high power square waves...
73, and thanks,
Dave (NK7Z)
On 5/27/2020 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
On 5/27/2020 10:23 AM, Rick Bates, NK7I wrote:
> Getting any manufacturer to routinely add filtering (even if under $1),
> won't happen without a lot of customer noise in return. ;-)
Of course the pressure should be at the design stage, not the retrofit
stage, but good luck getting that to
Just as other appliances sold these days with a motor i.e. washing
machines, dishwashers... while digital control may add nice features,
the noise generated can reduce operator pleasure (or operating hours).
Getting any manufacturer to routinely add filtering (even if under $1),
won't happen
Of late, the fans in these systems are speed controlled by PWM. Nice
high power square waves...
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 10:08 AM, Phil Hystad wrote:
I
to abundant wi-fi networks and HDTV antennas being popular for cord cutters.
Hank
K4HYJ
- Original Message -
From: Dave Cole (d...@nk7z.net)
Date: 05/27/20 12:40
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Quiet Ductless HVAC System
Maybe they are more hungry out here in Oregon
I didn’t know that an HVAC system would be an RFI generator. What part of HVAC
is the cause of this and is this a recent problem in manufacturing units?
Note — I have never lived in a home with AC — never had a need here in the
northwest (Seattle area). I probably should add that when we go
-
From: Dave Cole (d...@nk7z.net)
Date: 05/27/20 12:40
To: elecraft@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
raft@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
@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
Gary kk0sd
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Dave Cole
Sent: Wednesday, May 27, 2020 8:45 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Quiet Ductless HVAC System
Hi Albert,
Here are a few suggestions... When I added my furnace, I ma
@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
At our remote site, we have a new Mitsubishi 12000 BTU mini-split. It is
located right under our 30 ft tower with Yagis and wire antennas. There is no
detectable elevation of the noise floor nor any buzzing birdies on 160 thru 2m.
An external thermostat adapter was installed, and on the cable
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.
: [Elecraft] Quiet Ductless HVAC System
I purchased 2 Ramson Units from https://www.ac-world.com/
One for my ham shack and one for my Wife's storage that holds all of her
Special Olympics equipment.
I installed it myself and then had an HVAC company come over to purge the
lines etc just to be sure
I purchased 2 Ramson Units from https://www.ac-world.com/
One for my ham shack and one for my Wife's storage that holds all of her
Special Olympics equipment.
I installed it myself and then had an HVAC company come over to purge
the lines etc just to be sure it was done correctly.
Rich -
Albert,
I have an 18,000 BTU mini-split cooling my wood shop and radio shack. I started
with a high-end Lennox mini-split. When it died out of warranty I could not
justify the extra cost to go with the same model over a Mitsubishi. No
detectable RFI from either.
The Lennox was MS7-HO-18P
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