[TenTec] RFI question for Orion and other TT rigs

[James Duffer]

>From: Sinisa Hristov <shristov at ptt.yu>
>Reply-To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
>To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
>Subject: Re: [TenTec] RFI question for Orion and other TT rigs
>Date: Sun, 26 Jun 2005 16:25:04 -0400
>
>n3nd at aol.com wrote:
>
> > The use of aluminum instead of ferrous material (steel) for chassis,
> > separate compartments, etc. is probably one of the greatest reasons TT
> > rigs are more RFI prone.
>
>
>Aluminium provides more than adequate shielding against
>both magnetic and electric fields at shortwave frequencies.


I am not sure about the effectiveness of aluminium in shielding "magnetic" 
fields.  It seems that a high mu metal is the way to go for magnetic 
shielding.  That is what they used on CRTs to prevent magnetic interference.

>But plastics do not, and Orion's CPU, DSP's, AD and DA converters,
>front panel LEDs and keys are "shielded" by plastic only.
>
Certainly agree here.

>73,
>
>Sinisa  YT1NT, VE3EA
>_______________________________________________

73, Jim wd4air