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[Amps] issue with AL-1200 output -UPDATE NUMBER 2-

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Subject: [Amps] issue with AL-1200 output -UPDATE NUMBER 2-
From: "Jim Thomson" <>
Date: Wed, 28 Jun 2017 12:03:19 -0700
List-post: <>
Date: Tue, 27 Jun 2017 10:06:30 -0700
From: Tom Osborne <>
Subject: Re: [Amps] issue with AL-1200 output -UPDATE NUMBER 2-
>  ##Then a mating, non adjustable,  ground down, 2nd machine screw.  Then
> some locking nuts etc, so when adjusted, tweaked,  to the desired gap, its
> then locked down.

<Hii Jim

Would this work in an antenna tuner to keep it from arcing and blowing out
the bandswitch?  How do you know when this is adjusted right?   73

##  Assume  .5”  =  15 kv    .25 inch = 9000 V.   .125 inch =  4500 V    .0625 
=  2250 V. 
.03125 = 1125 V
Thats how air variables are rated.. between  smooth stator and  rotor plates.   
for in between values. 

##  I used feeler gauges for fine tweaking..and or digital calipers.   If u 
have an adjustable hi pot
tester, u can slowly bring it up, till the hb spark gap arcs..once.   But that 
only works if the gap is 
at least pre-set to less than what u are trying to protect.    That’s if u are 
testing the gap..while its
actually wired to the device u are trying to protect. 

##  what u might want to do is aprx the gap..then with tuner in ...normal 
operation.... see if  gap arcs
or not.  If it does,  open the gap a tiny bit, till  no arc under normal 

Jim   VE7RF

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