Hi Everyone,
In the interest of reducing email overload for our readers, it is time to close
this thread as we are over the OT posting limit of 5 to10 at most.
Plesse self moderate in the future.
73,
Eric
Mooderator etc.
/elecraft.com/
I had this stored on my computer. Good reading on this subject.
http://www.arrl.org/forum/topics/view/46
-
Roger W5RDW
--
View this message in context:
http://elecraft.365791.n2.nabble.com/OT-A-C-RFI-tp7632552p7632575.html
Sent from the Elecraft mailing list archive at Nabble.com.
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We had a well for 38 years, went through three 4 HP down-hole pumps, and
I never observed any RFI from it or the control/capacitor box at the
well head. The 240 V service to the entrance was buried. The pump ran
a lot when the irrigation system was on [making Pacific Gas & Electric
very
On 7/19/2017 7:52 AM, Clay Autery wrote:
H Jim... I have a variable speed down-hole pump on my water
well... reckon that could cause RFI via the AC wiring?
The down-hole pump is 220VDC on dedicated circuit, and shack is on a
separate dedicated circuit from same service with separate
This is gross over-simplification, but it is, sadly, the thinking of the
EMC community and the regulations on EMC.
I've written extensively on this, so won't repeat it here. Here's the
most recent.
http://k9yc.com/KillingReceiveNoise.pdf
And, of course, k9yc.com/RFI-Ham.pdf
VERY little RFI
Frankly, I've never checked to see if the down-hole pump is an RFI
source... Only use the well when I am outside for the most part...
That's why I solicited Jim's opinion of the case.
I'll have to run a purposely test.
I would think I could filter at/near where the AC lines go in/out of the
are usually a burst of very
closely spaced carriers (a few hertz apart) spaced about 18KHz apart.
---
Chuck, AE4CW
-Original Message-
From: Clay Autery [mailto:k...@montac.com]
Sent: Wednesday, July 19, 2017 10:53:AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] OT A/C RFI
H
There's basically two types of RFI.
Conducted --- Being noise/RFI traveling through the wiring thus via
direct connection. Conducted RFI can be attenuated to satisfactory
levels by including a power line filter in the system {preferably at the
source}. The filter suppresses conducted noise
Clay,
Given that the pump is far, far underground, as is most of the wiring, I
would expect it to be a trivial matter to filter the AC line, which
should be the only thing radiating... Was that the case for you?
73s and thanks,
Dave
NK7Z
http://www.nk7z.net
On 07/19/2017 07:52 AM, Clay
H Jim... I have a variable speed down-hole pump on my water
well... reckon that could cause RFI via the AC wiring?
The down-hole pump is 220VDC on dedicated circuit, and shack is on a
separate dedicated circuit from same service with separate sub-panel.
__
Clay
Please include me in a list of folks who wants to follow/contribute to
this topic if/when it goes off-list.
I am shopping for HVAC right now...
__
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389
On 7/18/2017 9:00 PM, Dave Cole wrote:
> When this goes off list please add
Thanks Jim!
I passed on the variable speed fan option as a result of the vendor
telling me I should skip it to avoid possible RFI.
He also said it made little difference in performance... BTW I have no
detectable RFI from my system.
73s and thanks,
Dave
NK7Z
http://www.nk7z.net
On
On 7/18/2017 6:02 PM, Erik Basilier wrote:
Need to replace my A/C, and worried about getting an RFI generator.
A few years ago I saw some advice about taming a new unit, and maybe even
getting instructions from the manufacturer.
Dave Cole has given you excellent advice, and you should follow
When this goes off list please add me as well... Don't tell them what
to do, tell them you want no RFI. If you tell them what to do, and it
does not work, it is your issue... Make it their issue. See my
previous post.
73s and thanks,
Dave
NK7Z
http://www.nk7z.net
On 07/18/2017 06:54 PM,
Write it into the contract that the unit will not generate RFI above
some level you are happy with, as received at your radio, using your
current antenna, across the entire spectrum your radio covers.
I did, and the installers then made sure it was RFI proof... I wrote it
into the contract
The timing is perfect. Please keep it on the list or add me to your direct
replies. Maybe we can cut it short of the limit for OT subjects without
needing a reminder.
I have not had an AC since last summer and have also not had any noise
around the shack. Now it's just getting to hot to deal
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