[Amps] Plated screws

[Fuqua, Bill L]

Inductive ovens operate at low frequencies, 100kHz and less usually. That is to get a greater skin depth. 
Due to skin effect, if you are operating in the MHz range most of the current will be thru the plateing not the core material.
Most plateings have high resistivity and are thick as well and some have two layers to allow a good bond between the 
final plate and the core material.
73
Bill wa4lav

________________________________________
From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf Of DJ7WW [dj7ww at t-online.de]
Sent: Friday, November 19, 2010 5:56 AM
To: amps at contesting.com
Subject: Re: [Amps] Plated screws

You will find out quickly if you use them to connect copper straps to coils
or band switches or elsewhere in rf fields.

In inductive ovens the same "eddy current" works quite effective

73
Peter

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of n8de at thepoint.net
Sent: Freitag, 19. November 2010 06:15
To: Stirling Schmidt
Cc: AMPS submit
Subject: Re: [Amps] Plated screws

Please explain WHY magnetic screws are 'inappropriate' for amp building?

73
Don
N8DE



Quoting Stirling Schmidt <kc0nxm at sbcglobal.net>:

> Hi all:
> Where's a good place to source nickel-plated brass screws? I have
> some from ages
> ago, but I'm assuming the hardware store zinc-steel variety are
inappropriate
> for amp assembly, as they are magnetic.
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>



_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps

_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps