[R-390] MOV's and snubbers

[David Wise]

Both sources indicate that proper values for the R-390A are more like 0.1uF and 10 ohms, not 100.

Dave Wise

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Roy Morgan
Sent: Friday, January 24, 2014 2:15 PM
To: R-390-List
Subject: Re: [R-390] MOV's and snubbers


On Jan 24, 2014, at 2:32 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:

> There is an application note at
> www.illinoiscapacitor.com/pdf/Papers/spark_suppression.pdf
> 
> I used 0.1 uF and 100 ohms

Jim,

Thanks for that link, good info to save.

The manual for the Hallicrafters HA-1  "T.O. Keyer" which uses a mercury wetted relay, has a graph to easily figure out a snubber network for the contacts.  That manual is on BAMA in .djvu  and .pdf form at:

http://bama.edebris.com/manuals/hallicra/ha1/

Roy

Roy Morgan
RoyMorgan at alum.mit.edu
K1LKY Since 1958

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