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@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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