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Re: [Amps] rotary switch - shorting/non-shorting

To: "Alex Malyava" <>, <>
Subject: Re: [Amps] rotary switch - shorting/non-shorting
From: "Tom Rauch" <>
Reply-to: Tom Rauch <>
Date: Thu, 30 Aug 2007 14:42:43 -0400
List-post: <>
> you know, guys,
> I was kinda surprised that I was able to fry the switch in 
> 200W-rated tuner
> using only 100W RF. Geez, I did it in 5 nimutes :)


Like I said I can fry a tuner that will take 500W  at 100 W 
or less if I tune it wrong.

It's all about how you tune it.

> Speaking of replacement - I found Lorlin CK1458 at 
> website. it is
> 250V or 15A rated, I hope it will work better than the 
> dead one.
> Is there any alternative place to look for rotary switches 
> and possibly
> variable capacitors/inductors?

The issue is almost always voltage in the network and 
voltage holdoff in the switch. Normally a switch is sized to 
fail slightly after the capacitors arc.

I wouldn't use a Lorlin CK1458. It's a single pole so you 
can't short the unused coil area out. That's bad news on 
high bands.

How many positions do you need?

73 Tom 

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