[AMPS] What materials to use in a RF field ???

[Don Havlicek]

Art,
You might look into using Delrin [high heat can be a problem] or UHMW
[my choice for your application], both of which have excellent RF and
DC/AC properties.  
You should be able to find both in any size you require.
You can check the specs at:

http://www.machinist-materials.com/Direct_sale/direct-sale-delrin-flat.htm

By the way, I am in NO WAY related to ANY company which manufactures or
sells these items.
Good Luck!
Don - N8DE

Arthur Moe wrote:
> 
> I am about to start on another 2 meter amplifier, my original 8877 is doing
> fine even after 20 years of service. It is not a copy of the W6PO design.
> It is a copy of one built by WB6NMT Louis Ancioux. It is a 1/4 wave
> electrically flat line with a sliding short, no tuning capacitor, and the
> antenna loading is a capacitive probe. He used his AMP on both 144 and 220
> I never tried to use mine on 220 but it should work fine.  Anyway my AMP
> is housed in a 4 foot rack weighs about 350 pounds the iron (transformer)
> weighs 185 lb. by its self.  This package is not very easy to take to the
> mountain tops for the VHF contests, it's been there and done that.
> 
> In doing some horse trading I ended up with a junker Amp Supply amplifier
> that is going to be the basis for a table top 2 meter AMP. What is there
> is the case, meters, and high voltage power supply with HIPRESIL
> transformer. What I would build is the same RF portion that I am using
> now. In my original I used Linen Bakelite for gibs and lead screw. This
> material does not machine well to say the least. So I am trying to find
> other material to use. Teflon (PTFE) is not rigid enough in the diameters
> needed. So the the QUESTION for the group is what other material would be
> usable. Looking for material that is rigid, has good machinabilty, and
> will work in a RF field.
> 
> Thanks for any help.
> 
> Art
> KB7WW
> 
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