[Amps] RF Chokes

[R.Measures]

On Jan 30, 2005, at 12:47 PM, Will Matney wrote:

> David,
>
> There's not much to test that for it's self resonant spot. Take your 
> coil and short out it leads.

Experience has taught me to wire the HV choke in place before testing 
for self-resonances.

> 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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>
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>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org