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

[MU 4CX250B]

Good answer. Only thing I'll add is that the results are altitude
sensitive. A larger gap is required at higher altitude, but I'm not
aware of any charts. I just use trial and error. Santa Fe is at 7000
feet elevation, and water boils here at about 195F.

73,
Jim
Sent from my iPhone

> On Jun 28, 2017, at 1:05 PM, Jim Thomson <jim.thom at telus.net> wrote:
>
> Date: Tue, 27 Jun 2017 10:06:30 -0700
> From: Tom Osborne <w7why1 at gmail.com>
> To: amps at contesting.com
> 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
> Tom W7WHY
>
> ##  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.   Extrapolate
> 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 operation.
>
> Jim   VE7RF
>
>
>
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