[Lowfer] Ferrite Loading Coil ?

[Dave Brown]

Here's a pic of another 'big lump' of ferrite being used to fine tune 
the loading for a 400 foot vertical ex AM BCB tower on 182 kHz.

http://homepages.ihug.co.nz/~tractorb/kumara%201997%20bi%20cover.jpg

Total L is  the tapped litz wound inductor in the background plus the 
horizontal one with the  30 inch ferrite 'slug' up its middle. The 
'slug' is made up of many discs ex pot cores assys  that are stacked 
in a slit-lengthwise pvc pipe that slides inside an outer pvc pipe.

I have a video of the mast being 'taken down' some time later - 'lump 
in throat' territory for any true lowfer hearing the 'thuuump' as it 
hits the ground...... !!
73
Dave, ZL3FJ


----- Original Message ----- 
From: "Peter Barick" <pbarick at wpo.cso.niu.edu>
To: <lowfer at mailman.qth.net>
Sent: Tuesday, February 12, 2008 8:29 AM
Subject: Re: [Lowfer] Ferrite Loading Coil ?


All, Warren,
I just came from that site! Nice picture of "the Core"! Has variometer 
too. Noticed the unloaded Q was 200.

>> However, verticals are rarely the best receiving antennas due to 
>> their very susceptibility to noise. <<

Verticals...here, noise (sshhh!) isn't a problem. Plus they're 
omni-directional. Plus the top hats are bird magnets for nature
aficionados. And for those fixated winding coils -- "Abun-danza"! 
Plus it werks here.

Thanks all, think I've got a grounding on ferrite .
Peter
-------------------------------------------

>>> <k2ors at comcast.net> 02/11/08 1:05 PM >>>

Peter,

  DK5PT used a pot core ferrite loading coil for transmitting and 
varied
the air gap of the core to fine-tune the inductance:

http://www.wireless.org.uk/dk5pt-f.htm

  However, verticals are rarely the best receiving antennas due to 
their very susceptibility to noise.
--
73 Warren K2ORS

_______________________________________________
>From the Lowfer mailing list
Send messages to: Lowfer at mailman.qth.net
To sub/unsub visit: http://mailman.qth.net/mailman/listinfo/lowfer


-- 
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.20.2/1271 - Release Date: 
11/02/2008 08:16