[RFI] Multi-Stage High Efficiency Air Conditioner Units

[K9MA]

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 at contesting.com> On Behalf Of K9MA
> Sent: Saturday, February 8, 2020 9:06 PM
> To: rfi at 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 at sdellington.us
>
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-- 
Scott  K9MA

k9ma at sdellington.us