Andy,
I think it's more a matter of comfort and familiarity than of technology
worship. Astron makes switching power supplies as well as linear, and
they are extremely reliable. All of the repeaters I have installed in
the past ten years have switching power supplies, and they are operating
flawlessly. Motorola uses only switching supplies in MTR2000, Quantar,
Quantro, and 1225-based stations- and for good reason.
None of the switching power supplies I have in service produce any
measurable harmonics or EMI, and the freedom from AC hum (ripple) is very
important. I'm sure there are some cheapo switching power supplies on
the market that are noisy and/or unreliable, but those made by Astron,
Duracomm, and Samlex are excellent choices, IMHO.
An excellent report on six brands of switching power supplies was
published in the January 2000 issue of QST Magazine. Each unit was
rigorously tested in the ARRL lab, and spectrum plots are included in the
article.
73, Eric Lemmon WB6FLY
Andrew wrote:
Hello Again,
Is there any reason that Linear (such as Astron) Power Supplies
over Switching Supplies for Repeaters? The linears run hotter and are
very heavy to lug to the site where as switchers have similiar
capacity and are 10X lighter. I have been running a Samlex Switching
Supply for about seven months and no trouble. Why does everyone
worship the linear supplies?
Andy KC2GOW
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