Dear Graham look in the files section and find antenna optimized ferrite sleeve-1.ppt best wishes Paul

I agree with this assessment about the outer sleeve shielding the coil. It is the basis for FM rejection using a ferrite bead with wire woven through the ends (4-hole or 6-hole). Putting an outer

Gentlemen: Putting my Moderator hat on, let's cut the discussion off here. I too look forward to any empirical data is devleoped regarding the pros and cons of whatever designs folks might have.

Hi Paul, You asked "are we saying there is no current in the field windings?" No - the electromagnetic radiation is inducing current flow in the coil - directly - and not via the ferrite rod. Any

Hi Chris, You wrote - "The "free space" magnetic field should create flux on both surfaces of the ferrite sleeve, so Paul's two-solenoid idea should give us a terminal voltage about twice that of a

Dear Graham any induced current in the wire system will create its own field regardless of what is going on in the ferrite are we saying there is no current in the field windings? please see my ppt

Hi Chris Go back to the basket weave reasoning. Same direction of charge flow inside and outside of a ferrite sleeve will set up opposite electron spins within the ferrite sleeve. Forget about

shielded absorbed by alternating outside surfaces. strategy amp-turn may magnetic sleeve > I think that the way to prove this one way or the other is to construct a ferrite sleeve antenna with

Hi Paul, What magnetic field ? !!!!! There are no fields due to electromagnetic radiation until a wire or coil (not ferrite) transduces them !!!!! The field in the ferrite comes from the coil

me. > No, they will not cancel within the ferrite. The signal flux exists only on the ferrite surface due to "magnetic skin effect". That's what allows us to have two solenoids, one on the

From: dhsatyadhana To: ultralightdx@... Sent: Tue, March 1, 2011 4:12:00 PM Subject: [ultralightdx] Re: Ferrite Sleeve Loop (FSL) antenna tests With two coils, it seems that the inner coil would be

No Chris I did not say that ! I said one way they will cancel in free space, the other way they will cancel in the ferrite. Both being 'no-win' situations. Maybe you could clarify where your 'school

Thank You for the Welcome Kenny, It took me a long time to figure out about the electron spins in ferrite, and as yourself here at the Ultralightdx group were the first to investigate FS Loop

Which is what I had intended from the very beginning. I would certainly like to see the school of physics where that came from. What you are saying is that if I have two coils, each with

Hi Chris, In 14093 you wrote . "The two windings would need to be constructed so that their currents are in opposite directions." That is why I replied. Now you say they are in series with the

Hi all: First, welcome to the Group, Graham! I'm glad you joined. Re: coil currents - that was my assumption: the two coils are fed such that they complement rather than cancel each other out. The

outside That's an interesting idea, sort of a ferrite sandwich loop. I've narrowed my choices down to using ferrite bars, and to start with just a single layer of the bars with one solenoid

there I never said that the currents would be passing oppositely. The solenoid on the inside of the sleeve and the solenoid on the outside of the sleeve are connected in seies so that their

Any guesses on how this approach might work: A Litz wire solenoid coil, with ferrite rods both on the inside and outside of the wire coil. I other words, it's a standard FSL (Ferrite Sleeve Loop),

Hi Chris. I have not seen all the posts here so I am not aware of Paul's suggestion, but two windings with currents passing oppositely will cancel whether there is a ferrite sleeve between them or