From: Sinisa Hristov <shristov@ptt.yu>
Reply-To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] RFI question for Orion and other TT rigs
Date: Sun, 26 Jun 2005 16:25:04 -0400
n3nd@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
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