On Jul 8, 2008, at 8:40 AM, Jan Erik Holm wrote:
Mike Penkas wrote:
I have 2 SEC1223's and no hash. I also have an Astron RS35 and
RS50 linear supplies. Sometimes the magnetic hum from them drives
me crazy. The little cork pads Astron puts in them to alleviate this
does not help much. I keep them under the closed console on the
floor.
Mike WA8EBM
Sorry to disagree but the SEC1223 is far from quiet. However it can
be made much better by modifications. The DC side needs much better
filtering, also some work can be done on the AC side.
I bought a used SEC-1223 at a hamfest to power my K2. I found it
reasonably quiet on all bands except 160m. I added ferrite beads and
bypassing to the DC output, and more ferrite to the AC leads and all
but knocked the birdies completely out of the picture on 160m.
Bill Coleman, AA4LR, PP-ASEL Mail: [EMAIL PROTECTED]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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