On Fri, 30 Oct 1998 16:11:22 -0500 (EST) Mike Sims <nasfred@1bigred.com>
writes:
>
>A source of ceramic forms for winding the chokes is to use the body of
>an
>old high wattage ceramic resistor (~100w). Remove the resistance wire
>and
>you end up with a ceramic form. The operative word is "old".
>
>WWII vintage resistors are good as the outer covering just flakes off
>when
>unrolling the resistance wire leaving a relatively smooth ceramic
>body. If
>you mount the ceramic form on a stand off insullator, the tabs the
>resistance wire was connected to can be used to tie off the beginning
>and
>end of the choke winding. (Small ceramic stand-offs are easier to
>find than
>large ceramic forms.)
Good idea!
>
>I've wondered why the resistance wire couldn't remain and not hook the
>choke
>winding to the tabs, or disconnect the resistance wire from the tabs
>if the
>tabs are to be used to anchor the beginning and ending of the choke
>winding?
>Haven't tried it, but can't think of a reason why the resistance wire
>couldn't stay on the form. Thoughts from the group.
Resistance wire has inductance...just like copper wire. You would then be
paralleling two inductors.
73 Carl KM1H
> 73,
> Mike, K4GMH
>At 03:54 PM 10/27/98 -0600, you wrote:
>>
>>>Now, how do you folks who wind your own accomplish getting the
>windings to
>>>stay where you want. Do you paint them with coil dope before
>removing the
>>>spacing wind? This is my first attempt and I need a little
>Elmering...
>>
>>Carl, KM1H, once suggested using a little fingernail polish. I tried
>
>>this on some coils I wound and it works GREAT.
>>
>>Just put a dab on the wire shortly before where you are going to
>apply
>>the spacing.
>>
>>However, if you are using a spacing wind, I am guessing that you are
>>creating a multi-section choke with supposedly different values of
>>inductance per each section. Well, according to some of the Elmers
>here
>>on the list, these sorts of chokes suffer from worse resonances than
>just
>>straight wound, single section chokes. What happens is that the
>choke
>>sections tend to couple to each other.
>>
>>Try the fingernail polish stuff to hold it though, it works good.
>>
>>73,
>>
>>Jon
>>KE9NA
>>
>>
>>--------------------------------------------------------------------------
>>Jon Ogden
>>
>>jono@enteract.com
>>www.qsl.net/ke9na
>>
>>"A life lived in fear is a life half lived."
>>
>>
>>--
>>FAQ on WWW: http://www.contesting.com/ampfaq.html
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>>
>>
>>
>
>
>--
>FAQ on WWW: http://www.contesting.com/ampfaq.html
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
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>
>
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