Re: [Amps] Line Isolators for RF feedback

[R.Measures <r@somis.org>]

On Jul 31, 2004, at 10:21 AM, Joe Isabella wrote:

> The one I use has ferrite beads stacked on top of each other (about 50 
> of the little buggers!!) on
> about a 12 inch piece of teflon coax.  Since it isn't a torroid, it 
> can't be saturated.

One wire through the center of a ferrite bead is a one-turn toroid.  
And yes, given enough current and freq., they can be saturated.  The 
only coax choke device that can not be saturated has an air-core or 
powdered-iron core.

>  It'
> supposed to handle 5kW, but I haven't quite hit it with that much 
> power yet ( :-)  ).  It totally
> fixed all my RF woes, and I had plenty!!
>
> Joe,
> N3JI
>
> --- Alek Petkovic <vk6apk@eon.net.au> wrote:
>
> > Ditto for me downunder.
> >
> > The Radioworks line isolators do the trick nicely.
> >
> > You can make your own as they are just coax wound around a ferrite 
> > rod. You
> > can also use the coil of coax like Rich suggests.
> >
> > They all work well  but the RadioWorks product is very neat and 
> > convenient
> > to use. It is nicely encapsulated with the female connectors on each 
> > end.
> > Makes it real easy.
> >
> > 73, Alek
> > VK6APK
> >
> > ps: Their wire antennas are well made and work quite ok as well.
> >
> > At 12:19 PM 30/07/2004, Harold B. Mandel wrote:
> > > Seconding the message below I add my personal endorsement
> > > to Radio Works.com.
> > >
> > > When moving my shack from the 12 month "dxpedition" in
> > > Secaucus, New Jersey to my home in Kentucky, a severe case
> > > of RF feedback plagued the station when activating a linear
> > > amplifier.
> > >
> > > Even though I was ready to plunk down cash for goodies, Jim, W4THU,
> > > took time to speak with me at length, and suggested several tests
> > > to further diagnose the culprit and refused to sell me anything until
> > > reporting back to him.
> > >
> > > I found out about Radio Works when up in new Jersey, and purchased 
> > > line
> > > isolators to cure RF feedback going into the hotel telephone system.
> > >
> > > Score for Radio Works: AAAAA+
> > >
> > > Hal Mandel
> > > KA1XO
> > > On Tue, 27 Jul 2004 07:34:28 -0500 "Gene Bigham" <jbigham2@kc.rr.com>
> > > writes:
> > > > I followed Radio Works recommendations for RF feedback problems.
> > > > Their line isolators and grounding ideas worked to cure a bad case
> > > > here.
> > > > _______________________________________________
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> >
> > http://www.qrz.com/vk6apk
> > http://profiles.yahoo.com/vk6apk
> >
> > _______________________________________________
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>
>
>
>             
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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