Topband: alternative to vacuum variables

[ZR]

Pete,
I used a big 300pf breadslicer with somewhere in the 7.5 to 9KV range ( I 
forget the spacing, it was a vintage Johnson) and a couple of 857 size 
ceramic caps for my Omega at a prior QTH.

Smaller spacing and lighter duty fixed caps didnt survive the 1200W of my 
own amp but the rebuild was tested with a customers Alpha 77DX and it held 
together fine. This was in the mid 80's and it was all housed in a plywood 
box.
The other cap was a standard smaller spacing, dont remember the value but 
its still partially together out in a storage trailer and I can measure it. 
I seem to remember it was an even older 1000pf Cardwell.

Carl
KM1H

----- Original Message ----- 
From: "Pete Smith N4ZR" <n4zr at contesting.com>
To: <topband at contesting.com>
Sent: Thursday, January 24, 2013 2:33 PM
Subject: Topband: alternative to vacuum variables


> One of the reasons I have mot gone to high power on 160 is the cost of 
> capacitors for my omega match - at least $300.  Anyone know of any 
> workable alternative?  I remember someone writing about using coiled-up 
> RG-8, RG-213 or maybe Teflon coax.  Where can I find more information?
>
> -- 
>
> 73, Pete N4ZR
> Check out the Reverse Beacon Network at
> http://reversebeacon.net,
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