[Lf] [Fwd: [Lowfer] Winding Ferrite loop, Litz size?]

[Andre' Kesteloot]

Phil Atchley wrote:

> Hello all...
>       Done some NDB's etc, used to use a 4 foot "pancake" wound loop which
> now isn't too practical in my new location (where to put it away from
> computer etc).  Very real estate limited on this mobile home park.  So I
> haven't done much beacon hunting since moving in here.
>
>       Decided to make a "double" loopstick using 2 15" ferrite bars to cover
> the Longwave band and the BCB band, put these one above the other on a
> common rotator which I want to mount on top of the pushup tv mast supporting
> my sloper (about 25 feet above the metal roof).  This is about as far as I
> can get an antenna from the "stuff" in the home and neighbors homes, my only
> concern is that the sloper may "re-radiate" into the loops but that can't be
> helped.
>
>       My intent is to remotely switch the two loops into the front end of a
> fet balanced amplifier which will be varacter tuned and mounted between the
> two loops, output of the amplifier fed to the "shack" via coax.
>
>       My  questions are these. (many of them)
>
> 1.  I presume I want to wind the VLF loopstick with litz wire. (already have
> a coil on the BCB loopstick) I see where Amidon has Litz in 8/42, 8/44 and
> 10/44 sizes.  Since the cost is the same does anybody know which would be
> better for the coil?  I haven't yet determined the number of turns needed.
>
> 2.  The two loopsticks will be in the same plane but since the two
> loopsticks (two 7.5 inch rods superglued end to end) will be tuning
> different frequency ranges I don't expect a lot of interaction between them
> between them but does anybody have a feel about a reasonable spacing between
> them with the amplifier between?
>
> 3.  I've read about putting the loopsticks in an aluminium "trough" (sp?) to
> act as an electrostatic shield.  Anybody tried this, detuning effects, loss
> of "Q" and loss of gain???  How did you make the "trough"?
>
>    This will be using PVC pipe construction to insure the entire thing is
> weathertight, of a sufficiently large cross section to fit the rotator
> (which I still need to get).
>
> 73 de Phil  KO6BB
> If it's more than 1dB above the Noise Floor "IT AIN"T DX"!
>
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