[TenTec] Re: EMI (was Argonaut 505 - The Answer)

[David McClafferty]

Steel would make the problem worse by providing a path
for the magnetic field. You would need "mu metal" for
a magnetic shield.
The "clamshell" type cases that Tentec used often act
as a shorted turn when they are close to a transformer
and the eddy currents setup a secondary field that is
picked up by the circuits inside the case.

Dave, VE1ADH

 --- JAMES T HANLON <knjhanlon at msn.com> wrote: > Alan,
> 
> For now I will take the easy way out and keep the
> transceiver away from AC fields.  I'll bring a piece
> of steel down from the attic next time I'm up there
> and lay it on top of the transceiver between it and
> the power supply to see if that makes any
> difference.  Perhaps a steel bottom plate on the
> power supply might be helpful too.  At least I know
> what to avoid now.
> 
> 73,
> 
> Jim
>   ----- Original Message ----- 
>   From: ARDUJENSKI at aol.com 
>   To: tentec at contesting.com 
>   Cc: knjhanlon at msn.com 
>   Sent: Thursday, December 18, 2003 2:30 PM
>   Subject: EMI (was Argonaut 505 - The Answer)
> 
> 
>   Electromagnetic Interference:
>   Without belaboring the point it was noted that the
> interference in the case of the 505 was magnetic
> related and not RFI. I did some GOOGLE searching on
> the topic (shielding magnetic interference) and
> discovered it is rather involved in shielding the
> problem and that removing (separating) the source is
> cheaper and simpler way to go. If you have the
> inclination you may want to check out the various
> sites for yourself with your own search. Very
> informative. Thanks Jim for pointing that out.
> 
>   Merry Xmas to all
> 
> 
>   Alan KB7MBI in Woodinville, WA
>   FISTS 5702 / ARS / Proud member of ARRL
>   ___ ___ . . . . . . ___ ___ DIT DIT
> 
>   PS I keep hoping that one day I will win an ORION
> as a *constellation* prize--smile
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec 

______________________________________________________________________ 
Post your free ad now! http://personals.yahoo.ca