[Amps] RF Chokes

[Will Matney]

David,

There's not much to test that for it's self resonant spot. Take your coil  
and short out it leads. Then use your dip meter and sweep all the  
frequencies it will be used at looking for a dip on the meter. If your not  
quite sure about the exact frequency at the dip, use a frequency counter  
with a pickup loop and place the dip meters coil beside it. It will show  
the exact frequency the dip meters set to (oscillating at). If you do find  
a hot spot, moving it to a unused band is accomplished by removing a few  
turns or even adding them. After that, just recheck it for where it moved  
to.

Will



On Sun, 30 Jan 2005 15:31:25 -0500, David C. Hallam <dhallam at rapidsys.com>  
wrote:

> After reading the posts on the subject of RF chokes over last few days, I
> guess I am going to have to go back to the drawing board.  I am in final
> stages of completing a continuous tuning 3.5 to 30 MHz amplifier and  
> really
> hadn't given the RF choke much thought.  Someplace (I don't remember  
> where)
> I picked up a nice solenoid wound RF choke on a ceramic form that "looked
> right".  Now I guess I will have to do some serious testing before  
> applying
> any power.
>
> David C. Hallam
> KC2JD
>
>
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