[ARC5] Fwd: Re: [MRCA] SCR-274-N receiver bandwidth spec

[Michael]

This is all very true however we don't know how the coils are done in the
command equipment so I'd think experimentation is indicated.

Best Regards,
 
Michael, K3MXO, CBLA #6, BL01hx15np24 ... or there abouts  
Sometimes I pretend to be normal but it gets boring so I go back to being
me.
http://www.nationalmssociety.org/chapters/NTH/index.aspx
http://wh7hg.blogspot.com/
http://kludges-other-blog.blogspot.com
Hiki Nô! 

-----Original Message-----
From: J. Forster [mailto:jfor at quikus.com] 
Sent: Monday, 24 March, 2014 10:37
To: Michael
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] Fwd: Re: [MRCA] SCR-274-N receiver bandwidth spec

The shield has two functions:

Electric field shielding
Magnetic field shielding

The eletri field shieldsing will depend drastically on the way the oils
are wound. Simplified:

 ///////// || ////////     =====> High E shielding effect
GND      H    H      GND



////////// || //////////   =====> Low E shielding effect
H       GND   GND      H


The H field shielding is pretty much indepensant of connetions.

-John

===============


> -----Original Message-----
> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net]
> On
> Behalf Of J. Forster
>> It is almost certainly at AC ground. It also shields between the coils
>> to
>> prevent capacitive coupling, which might be significant, depend9ng on
>> the
>> geometry.
>
> This goes back to what was mentioned earlier about installing a shield
> between the coils to reduce coupling rather than going through the trouble
> of spreading them apart.
>
> Best Regards,
>
> Michael, K3MXO, CBLA #6, BL01hx15np24 ... or there abouts
> Sometimes I pretend to be normal but it gets boring so I go back to being
> me.
> http://www.nationalmssociety.org/chapters/NTH/index.aspx
> http://wh7hg.blogspot.com/
> http://kludges-other-blog.blogspot.com
> Hiki Nô!
>
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