[Amps] Line Isolators for RF feedback

[R.Measures]

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 at 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 at 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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>>>>
>>>>
>>> _______________________________________________
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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