[Elecraft] Switching PS for travel with K2/100

[David A. Belsley]

John:
  You do indeed seem to have a defective unit. I have the SEC-1223 and 
there is no noise at all, even using when an end-fed antenna with the feed 
line passing within a few inches of the p/s unit. I would take it back, and 
I'd take a portable sw receiver along with me to test the new unit.  There 
have been varying reports on the quietness of the SEC-1223.  It would seem 
that either their quality control is lacking or they have several 
manufacturers for these units that do different quality work.

best wishes,

dave belsley, w1euy

--On Friday, August 1, 2003 9:39 AM -0700 John Webster <jww@dslextreme.com> 
wrote:

> Thank you to all those who replied, on and off list.
> Output voltage is adjustable.  I will report to the list
> the results in due course.
>
> But right now, a significant problem, that eclipses
> the output voltage issue.
>
> On tryout, the SEC-1223 is producing wide band
> white noise across most, if not all, ham bands.  This
> effectively raises the s-meter reading 3 to 5 bars!
> It blocks out signals, and renders the rx almost
> useless.  This is not what I expected.  Birdies or
> rough buzz on specific frequencies or range of
> frequencies--perhaps--broad band white noise
> was not expected.
>
> I tried moving the PS into another room (20 ft)
> running a long mobile type DC lead.  No
> difference, at all, to the effect with the PS next
> to the rig using a very short DC lead.  The noise
> is coming through the cable.  Running the K2
> off the Astron RS-35 while the switcher is on
> (but not connected to the K2) results in no noticible
> noise.
>
> One caveat to be fair, I am using a single wire
> end fed random 120 foot long wire ant, 2 feet
> of which are in the shack from rig to exit point
> out of the house.  This makes noise pickup much
> easier.  BUT the point of the whole exercise is
> portable operation with random length wire
> antennas hanging out of hotel windows.  SO . . .
>
> My hunch -- something is defective with the
> output RFI suppressors on the DC out line in this
> particular unit.  Solution?  Take it back and swap
> for another?  Or is this the inherent "personality"
> of a switching PS that I have to learn to live with?
>
> Comments, help?
>
> Thanks,
>
> John, N6JW
>
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----------------------------------
David A. Belsley
Professor of Economics