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@telus.net> wrote:
>
> Date: Tue, 27 Jun 2017 10:06:30 -0700
> From: Tom Osborne <w7why1@gmail.com>
> To: amps@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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