[AMRadio] Transmitting Mica F2 -vs- G2 types

Barrie Smith barrie at centric.net
Thu Sep 13 13:50:37 EDT 2007

Why not put the two you have in there now in series?

That would equal 750 pf, with plenty of voltage and current capability.

73, Barrie, W7ALW

----- Original Message ----- 
From: "A.R.S. - WA5AM" <ars.w5ami at gmail.com>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Thursday, September 13, 2007 11:01 AM
Subject: [AMRadio] Transmitting Mica F2 -vs- G2 types

> 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.
> Thanks,
> Brian / wa5am
> -- 
> "Money is only temporary, but radios are forever" - Jim Little aka
> "the old dog"/K5BAI
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