[AMRadio] Re: Transmitting Mica F2 -vs- G2 types


A.R.S. - WA5AM ars.w5ami at gmail.com
Sat Sep 15 12:03:50 EDT 2007


On 9/13/07, A.R.S. - WA5AM <ars.w5ami at gmail.com> wrote:
> I am getting ready to convert my Gates BC-1T to 75 and 160 and need
> some opinions on the loading cap.  The 1T uses fixed capacitance and a
> variable inductor for loading.  I need about 750 pF for the loading
> cap on 75 meters.  The original loading caps (two in parallel) are G2
> micas at 8000 vdc, however they are both 1500 pF.  I have a type F2B
> that is 800 pF at 6000 vdc, that would be close enough, but I'm afraid
> it may not handle the current.  The F2 is a much smaller unit than the
> G2's that are in there now.  Anyone have any opinions on what the F2
> can handle?  Being on a higher freq. than original design I think the
> 6KV rating might be okay, but I'm still concerned with the current
> rating of the F2 as opposed to the type G2.
>
> Nebraska Surplus has what I'm looking for, but they want $175 for it.
>

Correction to this.  After going back to the shack and looking once
more, these are type F3 caps, not G2.  Still need a single 750pF
(aprox) @ 8000v, or two at around 375pF, same voltage.


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