[R-390] Re: Isolation xfmrs available

[Drew Papanek]

Jim Miller wrote:

>I wonder if using a low-cost UPS (battery backup
>computer supply - as a substitute for an isolation
>transformer) would work for the 390 to prevent GFCI tripping?

The cheaper ones would not work because they power
the load via direct line connection, switching over
to an internal inverter only when the line fails.

The better units, often called "power conditioners",
run the load from the inverter at all times and would
work as an isolation device.  That said, I'm not sure
if you'd want to run a receiver such as the R-39x series
from one of those units.  Virtually all of them "assemble"
the 60 Hz sinewave from a series of high frequency, high
harmonic content squarewaves to allow the use of a cheap,
lightweight ferrite transformer.  You would likely get the
same type of hash as from a computer power supply.

However, you may find a "power conditioner" that has good
filtering and shielding.

Someone might try one and report back with the results.

Drew