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Re: [TenTec] Need advice about OVP for 262G

To: tentec@contesting.com
Subject: Re: [TenTec] Need advice about OVP for 262G
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Reply-to: geraldj@storm.weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 01 Apr 2009 13:19:11 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On Wed, 2009-04-01 at 13:55 -0500, Hulett, Russell wrote:
> OK, you've convinced me that a Zener transient protection won't work and to 
> build a crowbar using a zener and an SCR.  Looked at the Handbook circuit 
> with the transistor trigger for the SCR, and Ten Tec sent me the circuit used 
> for the 280 PS crowbar.  Most of the other crowbars I see on the web look 
> like the latter, so the 280 example is probably what I will duplicate.
> What I was hoping to find out was what other 252/262 owners had added to 
> their old power supplies to make them safe to use.  
> Thanks for the help.
> 73, Curt KB5JO

Yes the handbook circuit is more complex and more expensive (at least
ten cents for the added transistor) but I think the capacitor there
helps keep down transient and RF triggered nuisance trips

73, Jerry, K0CQ

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