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From: email@example.com (Nico Coesel)
Subject: Re: Strange failure mode in switchmode power supplies: Followup
Date: Mon, 23 Sep 2002 14:32:14 GMT
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
NNTP-Posting-Date: Mon, 23 Sep 2002 14:22:23 +0000 (UTC)
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Boris Mohar wrote:
>On Mon, 23 Sep 2002 04:50:13 -0000, email@example.com (Peter
>>Boris Mohar writes:
>>>>Sorry to keep harping on about this bit, but wouldn't the ferroresonant
>>>>transformer clean up anything like this? That is, it'd isolate the equipment
>>>>from any line conditions of the kind being discussed, ruling out a lot of the
>>>>potential problem areas. I realise it's not a silver bullet, but I got it in
>>>>the hope that I could at least count out the majority of possible problem
>>>Did you try without the ferroresonant transformer?
>>Yup, tried it with and without to see whether there was any change (nope,
>>none) - this is why I was assuming it wouldn't be any of the more obvious
>>causes, because the performance was identical with and without the ferro
>>between the affected gear and the power source.
>>>I had some nasty interactions between the UPS unit (APC make) and the
>>>ferroresonant transformer. It would refuse to start up every time.
>>Oh good, I'm about to test an APC UPS :-). Actually I had no problems with
>>some sacrificial PCs and an older (IPT) UPS.
> My APC was Back-UPS 250.
Such UPS don't do any filtering (APC likes you to believe otherwise).
It can be used for limited testing when the equipment is running from
The fact that the OP can't use DECT phones is an indicator that a
strong electric/magnetic field is present. He should investigate in
that direction. Giving the FCC a call and ask them to check things out
might be the most sensible thing to do.
Reply to nico@nctdevpuntnl (punt=.)
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