[R-390] MOV's and snubbers

[Phil Mills]

This begs the question....which I'm not capable of
answering though....   The HA-1 keyer is most
likely used for keying DC circuits.  Is that chart
in the manual good for AC circuits?

Roy, thanks for pointing out that manual.  I used
an HA-1 for several years and never paid any attention
to that table or the need for a snubber.

Phil   W5BVB


----- Original Message ----- 
From: "Roy Morgan" <k1lky68 at gmail.com>
To: "R-390-List" <r-390 at mailman.qth.net>
Sent: Friday, January 24, 2014 4:15 PM
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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