[mythtv-users] Loss of Service Recognition -- Nifty!
beww at beww.org
Sat Mar 18 17:15:05 UTC 2006
On Mar 18, 2006, at 10:01 AM, Tom Burt wrote:
> On Saturday 18 March 2006 15:51, Brian Wood wrote:
>> Unless your cable box, sat receiver or RF amplifier etc. are *not* on
>> the UPS. Even a short blip could cause a channel change or power down
>> and your recording would be "adversely affected".
>> While it might not directly screw up recordings, it's nice to have
>> your Cable Modem, DSL box, router, switch etc. all on the UPS as
> Before you connect all your stuff, make sure they really work when
> fed from
> the UPS. E.g. the output voltage of my UPS drops considerably (by
> design!) in
> case of a power failure. A switching power supply in a computer can
> this but other devices may not. Once I tried to use my cord shaver
> off the
> UPS. Not a pleasant experience... but it was an emergency ;)
Good point. Good quality UPS units that output something even
resembling a sine wave and can handle highly reactive loads are very
expensive. The low-cost units sold at computer stores work in most
cases but output a waveform that looks like it would be more at home
on a hospital cardiac monitor.
I think most modems, switches etc. use a "wall wart" power supply,
and transistors being cheaper than transformers, inductors and
capacitors they are mostly switching units and should work on the
No substitute for testing though, and a "fire drill" test of UPS
installations is a must.
Also, as most of us use one or more power strips, wrapping electrical
tape around the switch to hold it in the "on" position is a good
idea, it's awfully easy to hit those switches by accident, not to
mention kids, pets, wives and vacuum cleaners.
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