Oscillating Lab Power Supply

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Oscillating Lab Power Supply

K9MA
The other day, I was testing my new KX-1 with one of these power supplies:

http://www.amazon.com/Mastech-HY3005D-Variable-Linear-Supply/dp/B000E14F56

It caused some awful garbage to come out of the KX-1, which was caused
by the power supply oscillating and generating a bunch of 120 Hz
ripple.  They're sold under several brand names, and there are several
versions, all basically the same.  I'm guessing I'm not the only one who
was attracted to their low price.

The fix is easy, though it took most of the day to figure out. Contact
me if you need it.

73,

Scott  K9MA

--
Scott Ellington  K9MA
Madison, Wisconsin, USA

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Re: Oscillating Lab Power Supply

W1KSZ
Or, you could go over to that "auction" place and buy a real power supply,
like Kepco or Lambda or ... (one marked ..."Made in U.S.A."...).
If you want the "Cadillac of the Industry, find a Krohn-Hite.

73, Dick, W1KSZ

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Scott
Ellington
Sent: Friday, April 01, 2016 6:11 PM
To: [hidden email]
Subject: [Elecraft] Oscillating Lab Power Supply

The other day, I was testing my new KX-1 with one of these power supplies:

http://www.amazon.com/Mastech-HY3005D-Variable-Linear-Supply/dp/B000E14F56

It caused some awful garbage to come out of the KX-1, which was caused by
the power supply oscillating and generating a bunch of 120 Hz ripple.
They're sold under several brand names, and there are several versions, all
basically the same.  I'm guessing I'm not the only one who was attracted to
their low price.

The fix is easy, though it took most of the day to figure out. Contact me if
you need it.

73,

Scott  K9MA

--
Scott Ellington  K9MA
Madison, Wisconsin, USA

[hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message
delivered to [hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]