Brendan Minish wrote:
> On Fri, 2009-12-04 at 14:02 -0500, kd4e wrote:
>> Good info.
>> What I need is a good UPS that doesn't generate hash while
>> recharging, maintenance charging, or inline use during a
>> grid failure.
> I have found the APC smart UPS series quite noisy at HF and MF.
> They can be tamed with good line filtering (line and protected sides)
> and appropriate bonding.
I'm running 6 APCs that vary from 500 watts to 1500. I can't imagine
running a modern computer on anything less than the big ones. So far
"on the ones I have", when running off the battery I've found no
discernible noise in the HF range.
> The smart ups series are line interactive and
> are great units (from an IT managers perspective) but I have not found
> them particularly clean from a radio users perspective.
However what's really needed is a line conditioner. They are like a UPS
but run off the battery all of the time. The circuit is tailored to give
a very good, clean, regulated sine wave and they are about 2 to 4 times
the price of the same size UPS. I should say were as I've not looked
for one in a long time.
> I also have an APC back UPS on the shack PC.
For the ham shack I run the rigs directly off batteries while the AC
accessories run off the smaller UPSs.
I don't have anything big enough to power the amps. Those would take a
big bank of batteries through a good inverter which would end up costing
more for batteries than the whole station with the exception of the
tower and antennas.
> its fine in standby but
> somewhat noisy when there's a power failure. They are adequate units for
> singe PC type loads.
> That works for me because it's only role is to keep the PC running long
> enough for a clean shut-down should the power fail.
> My Radios all run off a pair of 110AH deep cycle lead acid batteries
> that are float charged by a clean 23A Switch mode power supply (SEC 1223
> with some extra filtering fitted)
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