[RFI] question regarding Carrier furnace

Eric Gustafson Eric Gustafson <n7cl@mmsi.com>
Thu, 27 Jul 2000 08:04:45 -0700

Hi Ed,

Well, I admit that I was considering emissions primarily.  But
what I was talking about was getting an _indication_ of
_potenntial_ problems.

One of the hats I wear here at work is testing for and
engineering mitigation of conducted and radiated emissions and
susceptability for our products (which combine radios and
embeddeed microprocessors).  I find generally that steps taken to
mitigate emissions also (usually) help improve susceptability
performance.  So if a device has a noise generating source in it
(like a microcontroller) and is observably quiet outside its own
cabinet, it is probable that the device will be less susceptable
to EMI than a similar device which is noisy.

Of course you can't take a 3V/Meter emitter down to the store and
blast the crap out of their merchandise.  So your "purchase on
contingency" plan is obviously the right way to approach the
problem.  My proposal was aimed at reducing the number of
instances of the "in home" testing that might need to be

73, Eric  N7CL

>From: "EDWARDS, EDDIE J" <eedwards@oppd.com>
>Date: Thu, 27 Jul 2000 08:36:18 -0500
>> -----Original Message-----
>> From: Eric Gustafson [SMTP:n7cl@mmsi.com] I don't have any
>> furnace info for you.  But I do have a shopping procedure that
>> I use in these cases.  I go down to the supplier with my
>> battery portable HF receiver (either Radio Shack or Sony) and
>> make him show me one of whatever he is trying to sell me
>> powered up and operating.  Then I discover unambiguously
>> whether there is a potential problem or not.
>	A rcvr will tell you if it makes noise.  That is
>important, especially for DXers or contesters.
>	But do you also transmit?  Kinda hard to set-up, but
>that's the other half of the EMI problem when it comes to
>susceptable equipment: Does it respond to RFI in a unwanted
>manner? i.e. unit shuts down or starts up suddenly, etc.
>	The only way to prepare for this in such a purchase is to
>warn to sales people that you have transmitting equipment, that
>you expect their equipment not to respond to RF, and if it does
>negotiate an acceptable resolution before the problem is found.
>	There is a warranty, and they will get tired of being
>called out, so it's in their interest to resolve ALL problems.
>Good luck with your purchase.
>	73,
>	de ed -K0iL

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