On May 25, 2007, at 7:04 AM, Solosko, Robert B (Bob) wrote:
Hi Elecrafters,
I just sold my big, heavy linear power supply to replace it with
a small, light weight switching supply that I can pack into a suitcase
with my K2/100. Looking at the eham.net reviews, comments on all of
the
switching supplies seem to range from "great, absolutely no switching
noise" to "noise everywhere", and everything in between. Given the
sensitivity of the K2's receiver, is power supply switching noise
likely
to be more of a problem with the K2 than with some other rigs? Are
there
any switching power supplies that you'd recommend that work well with
the K2 (and have little or no switching noise that the K2 would
pick up)
and are there any that I should definitely avoid?
There are several product reviews on various switching power supplies
available to ARRL members on the ARRL web site. The January 2000 and
September 2000 issues, in particular, did a number of comparisons
showing noise spectrum. Based on those reviews, I bought an Alinco
DM-330MV. It has a knob to adjust the switching frequency in case
there is a noise problem, but I haven't found any noise that either
my K2 or my TS570D can detect. I also have a MFJ-4103 which I use for
travelling with the basic K2 (very small, 120/240 volts input) and
haven't had any noise issues with that one either.
73 - Bob, N7XY
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