[Johnson] Soft-start mods

[K6JEK]

Inrush current limiters are available from Mouser,  probably also 
available from Newark, Digi-Key, Allied, and everywhere else under the 
sun.  They have different current and resistance ratings.   I use 
smaller ones in receivers than in transmitters.  One thing to remember 
is they are thermal gizmos.  They have to cool off a bit to gain back 
the resistance.    I'm away from my notes or I'd give you more 
specifics -- which ones I picked from my Ranger etc., but I'm sure you 
can figure it out.

Here's is a Mouser web page for you:

	http://www.mouser.com/catalog/624/422.pdf

Or just use their search engine from the Mouser main page and type in 
CL-30

Jon, K6JEK

On Dec 7, 2005, at 4:14 PM, Brian Carling wrote:

> It's easy - you just put one of these little pancake gadgets in series
> with the primary and that nasty THUNK! is gone.
>
> Someone gave me about half a dozen of these things.
> I am not sure what they are nut they measure about 4 ohms cold.
>
> They are black and marked as:
> STM
> CL-30
>
> Where do y'all get these wonderful gadgets and what are they
> called?
>
> 73 de AF4K, Bry
>
> On 6 Dec 2005 at 11:03, John Lawson wrote:
>
>>
>>
>>    Anyone ever put in a 'soft start' or 'inrush limiter' in one of the
>> larger Johnson rigs?  Just curious.
>>
>>    My friend has a 500 - it "bangs" pretty good when keyed, and my 
>> Valiant
>> tries to jump off the table once in a while. (Good thing it weighs so
>> much!).  Both of us are using solid-state rectifiers in the HV side.
>>
>>    I know of many commercial inrush snubbers - just to cut down on 
>> that
>> 'switch closed near peak in cycle' stress - hmmmm - maybe even a
>> 'zero-crossing' switch in the HV primary circuit....
>>
>>
>>   Cheers
>>
>> John   KB6SCO
>>
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