According to the Amidon literature I have in front of me, the FT-50B-77 has
a value of 2160 mH per 1000 turns. So that would mean that 10 turns is
21.60 mH. So that's way to big. However, it still didn't stop the 20M RF
from messing with things.
You'd think it would since it's a rather large impedance at 14 MHz, but it
didn't.
73,
Jon
NA9D
-------------------------------------
Jon Ogden
Sales Engineer
Cain-Forlaw Company
847-202-9898 (Voice)
847-202-9896 (Fax)
jon.ogden@cain-forlaw.com
> -----Original Message-----
> From: EDWARDS, EDDIE J [mailto:eedwards@oppd.com]
> Sent: Tuesday, June 26, 2001 11:18 AM
> To: 'Jon Ogden'; 'RFI'
> Subject: RE: [RFI] Touch Light Update #3
>
>
> > -----Original Message-----
> > From: Jon Ogden
> > > Have you tried a "micro" Henry choke on the sense line?
> > No I have not. I had assumed that the sense line wrapped around the
> > torroid
> > would end up looking similar to using a choke in series in the line.
> > Perhaps I am mistaken. Ten turns of the wire around an
> FT-50B-77 (half
> > inch
> > torroid using the 77 material) didn't do much to solve the
> problem. Maybe
> > it's not the same as a choke actually in series with the line.
> >
> I'm not sure how to calculate the inductance of the FT-50B-77.
> Anyone know if it's the same as the FB-(77)-1024 listed in
> the ARRL RFI
> book? And if so, what are the "A-sub-L v Mix No." values
> listed in table
> 2.2? Seems to indicate nanoHenries. So then FB-77-1024 is
> 5600 nanoH or
> 5.6 microH? For how many turns? One? So many questions!
> If it is one
> then would've been 10 times 5.6 for 56 milliH. That might be too much
> inductance and reactance for the sensing line. But this is
> all a complete
> guess without the answers to my questions.
>
> An actual inductance value for the FT-50B-77 would be helpful to
> know for sure.
>
> 73,
> de ed -K0iL
>
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