[Ham-Mac] Re: RFI

[Chuck Counselman]

At 1:40 PM -0500 6/23/06, Dick Kriss wrote:
>The picture is really good but how did you solder the connectors?  My guess
>is you started with one already attached then attached and soldered the
>other connector.
>
>Impressive
>
><http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf>


I guess you're referring to the photo on page 1.  I didn't solder any 
connector.  I used a 3-ft. jumper of mil-spec RG-213/U that had 
PL-259 connectors already installed on both ends, one Cable X-Perts 
p/n CXP213C3, price $15.95 at 
<http://www.cablexperts.com/cfdocs/cat.cfm?ItemGroup=4&itmsub=0&bskt=0&USA_ship=1&c=0>. 
(IIRC, Ham Radio Outlet also carries this item.)  I simply threaded 
this jumper, with its connectors attached, through the two stacks of 
ferrite toroids.  The whole process takes less than a minute and 
requires no tools.

It is both cheaper and more effective than any commercially available 
choke of which I'm aware.  It handles >1.5 kW up to 30 MHz, which the 
Radio Works "Line Isolator" can not do (contrary to some of its 
advertisements).

73 de Chuck W1HIS