[Lowfer] Ferrite Rod

Tue, 28 Oct 2003 15:40:23 -0500

Peter... A few more details,

The loop is wound with  litz wire but the first version, was wound with
magnet wire to get an approximate length needed to resonate.
I hate to waste Litz wire.

It is a single wrap that fills approx. 80% of the core.  There is a tunable
mica that allows about 100 KHz to 200 KHz tuning.  This fits in the ""T"
in the middle of the PVC.  This allows convenient mounting.

Yes... A preamp is indeed needed since the area of the antenna is so small.
I used a balanced preamp made with MPF-102's and a 2n3904? to drive the
coax.

Seems to work ok.   Should measure the "Q" one day.
Really its was just something to mess around with,  not really a serious
effort.

PaulC
W1VLF

----- Original Message ----- 
From: "Peter Barick" <[email protected]>
To: <[email protected]>
Sent: Tuesday, October 28, 2003 12:31 PM
Subject: Re: [Lowfer] Ferrite Rod

>
> Interesting, Paul. Can you describe the setup further:
>  1) The windings, is there more than one?
>  2) Have you tried one winding for the full length and then another at,
> say, the center?
>  3) Is the winding single or multi-layered?
>  4) Is it tuned or untuned?
>  5) Does it feed a pre-amp?
>
> I have some ferrite I got from Nebraska Surplus a while back.
>
> Cheers,
> Peter
>
> >>> [email protected] 10/28/03 10:11AM >>>
> >Hey Mike,
> >>
> Well awhile back I found them at a local fleamarket.
> They are actually about 10" to 12" long each, and I have 3 in series,
> glued
> with some old ferrite glue I had from back in TV repair days.
> The rods were about 3/4" in dia with a hole in the middle..
> ...
> Litz windigs were added, and  the whole thing is fitted into a PVC pipe
> and
> sealed with hot glue gun.
>
> PauLC
> W1VLF
> >>
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