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Re: [RFI] Multi-Stage High Efficiency Air Conditioner Units

To: Gary <gary_mayfield@hotmail.com>, "rfi@contesting.com" <rfi@contesting.com>
Subject: Re: [RFI] Multi-Stage High Efficiency Air Conditioner Units
From: K9MA <k9ma@sdellington.us>
Date: Sat, 8 Feb 2020 21:33:24 -0600
List-post: <mailto:rfi@contesting.com>
No, the phenomenon I'm talking about is caused by even low frequency RF getting into circuitry where it doesn't belong. It has nothing to do with the operating frequency of the susceptible device. Only better filtering eliminates it.

73,
Scott K9MA

On 2/8/2020 21:11, Gary wrote:
The frequency of every thing has gone up. You are no longer in band for any of 
electronics.

Years ago my two meter rig heard and could reboot the ATM machine. Years later 
I heard the ATM on 440 MHz.  It's higher than a GHz now.

73,
Joe kk0sd

-----Original Message-----
From: RFI <rfi-bounces+gary_mayfield=hotmail.com@contesting.com> On Behalf Of 
K9MA
Sent: Saturday, February 8, 2020 9:06 PM
To: rfi@contesting.com
Subject: Re: [RFI] Multi-Stage High Efficiency Air Conditioner Units

On 2/8/2020 19:58, David Eckhardt wrote:
If things are designed and executed properly with EMC/RFI in mind,
there should be no need for these clamp-on ferrite 'beads'.
SOME kinds of home electronics devices have gotten better. 25 years ago, my YL 
bought a fairly expensive electronic piano. Despite several pounds of ferrites 
on the power cord, I still wiped it out. Then, a couple years ago, she bought a 
new one. No external ferrites. I've tried my best in many contests, but I can't 
make the thing flinch. (She often is practicing when I'm operating. I'd hear 
about it.) It's a different brand (Kawai now, Yamaha then). I'm a bit puzzled 
by that, actually: Why would an electronics manufacturer go to the trouble of 
making something that RF proof, when so few of their customers have a 
transmitter that close? Not that I'm complaining.

Other home electronics devices seem to have gotten better, too. Now, if only 
they'd do something about those switching supplies!

73,

Scott K9MA

--
Scott  K9MA

k9ma@sdellington.us

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--
Scott  K9MA

k9ma@sdellington.us

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