[Central-Electronics] Fwd: Re: 6550

[Gordon]

Still trying to find the correct 22uH Choke o the output of the CE-100V.
here are some pictures of what I need.
Anyone have something like it?   22uH is the Value, other then that, The 
manual doesn't say much about it. Is there a Parts list for the CE-100V 
somewhere?
http://www.n6wk.com/choke/DSC_0009.JPG
http://www.n6wk.com/choke/DSC_0010.JPG
http://www.n6wk.com/choke/DSC_0012.JPG
http://www.n6wk.com/choke/DSC_0014.JPG

You can clearly see in the pictures that it cooked!

73,
Gordon
N6WK


On 7/25/2013 3:26 PM, Gordon wrote:
> Jim,
>   I found a Choke that is 22uH and resonant around 40mhz and rated at 
> 1Amp
> I guess I'll try that one.  ( Actually, I went to mouser and ordered a 
> whole selection of 22uH Inductors..LOL )
>   I do Not have a meter like that.
> I have one that measures Inductance, one that does capacitance, one 
> that does Resistance and all the normal Test Equipment including a 
> Spectrum Analyzer, Scope, Freq Counter and Generator.
> 73,
> Gordon
>
> On 7/25/2013 2:18 PM, Jim Candela wrote:
>> Gordon,
>>
>>      I wonder if you have an impedance meter? Something like an Autek 
>> RF1?
>>
>> http://www.autekresearch.com/rf1.htm
>>
>>
>>
>>     These will measure RF components at whatever frequency you 
>> choose. Lots of folks miss the point that at RF, a part that is rated 
>> at 1 Khz is likely to be way different. For example, a .01 uf disc 
>> capacitor wrapped around my grid dip meter coil with the leads 
>> twisted together in a loop, will go through series resonance at 
>> around 7 Mhz. So above the resonant point (series resonance) this 
>> thing looks like an inductor. For a parallel resonance situation an 
>> inductor looks like a capacitor when above the resonant frequency.
>>
>> Another possibility is a grid dip meter. With a grid dipper you can 
>> wind an air core coil, and with a known capacitance make a parallel 
>> L-C circuit. Then use the Grid dipper to find the resonant point(s). 
>> For example a 22 uh inductor should resonant with a 100 pf capacitor 
>> at about 3.4 Mhz.
>>
>>    As to the size, the 100V puts out 100 watts into 50 ohms, so that 
>> would be 71 volts RMS. This inductor therefore should not be tiny. 
>> Perhaps wind the coil as several smaller coils in series to minimize 
>> the turn to turn capacitance that will cause a coil self resonance at 
>> a higher frequency. Maybe try 10 turns #28, 1/4" dia, then move over 
>> 1/8" or 1/4" and do it again two or three times. Then see where you 
>> are. You could get more scientific of course, but with a little 
>> instrumentation, and sweat you can likely get there without puling 
>> out the credit card.
>>
>> Jim
>> WD5JKO
>>
>>
>>
>
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