[BC] dual ferrite AM antenna

[RON DOT'O SR.]

We have one of the older Justice antennas (inop).  It's two coils wound on 
each end of a single ferrite stick about 6" long and amplified with a 
transistor amp on a PC board inside the rectangular black box.  We also have 
the current version.  The working current version seem OK but is handicapped 
indoors.  It's basically an amplified loop stick antenna.  I don't know what 
the second winding does for it.  I talked to C. Crane's tech about repairing 
the old one and they no longer support it and have no service data on it 
(they say).  I asked about service data on the current model and was told 
that it's proprietary.  So if you get a current model and it goes bad either 
they fix it or if they have yet a third version then you're SOL.  The system 
consists of the loop box/amp, connection cable with a six pin DIN connector 
on each end, a control box with tuning controls (DC, course and fine) and a 
DC wall wart to power it or use a 9V battery.  It also has a cable that runs 
from the control box terminated in an RCA connector that can be plugged into 
a receiver input or plugged into an included ferrite loop stick to proximity 
couple to the built in receiver loop stick.  None of the components are 
interchangeable between versions except for the loop stick that couples to 
the receiver and the multi pin connecting cable.  You can buy an optional 
25' connecting cable and mount the antenna box outdoors sheltered from the 
rain as it's not weather resistant.  It's also pretty directional.  As for 
eliminating fading....Good Luck!  I don't think that 6" spacing of the loops 
is quite enough for diversity on MW.

Ron D, Salem, OR


----- Original Message ----- 
From: <WFIFeng at aol.com>
To: <broadcast at radiolists.net>
Sent: Tuesday, January 03, 2006 07:04
Subject: Re: [BC] dual ferrite AM antenna


> In a message dated 01/03/2006 09:16:18 AM Eastern Standard Time,
> ranchorobbo at hotmail.com writes:
>
> > It is sold by C. Crane.   here's a link to it on their website:
> >
> >
> http://www.ccrane.com/antennas/am-antennas/twin-coil-ferrite-am-antenna.aspx
> >
> >  Anyone ever used one of these and know if it really works?
>
> I would imagine it's performance not much different than the tuned-loop... 
> It
> looks like the ferrite core/coils are housed in that larger black unit. If
> the loopsticks were seperate, and could be phased/tuned independently, I 
> would
> imagine it would be far more effective at eliminating interference.
>
> I don't know about eliminating fade, either. The only way to minimize that 
> is
> with Diversity, and at MW freq's, you'd need to put those antennas fairly 
> far
> apart.
>
> The only instant advantage I see to this over their tuned-loop, is that 
> this
> looks like it's meant to be mounted outdoors. That, alone, could be a
> significant improvement for marginal situations with lots of 
> internally-induced RFI &
> shielding.
>
> I have easy do-it-yourself plans on my WEBsite, to make a nice tuned loop
> antenna that works amazingly well.
>
> http://www.mymorninglight.org/loopant.htm
>
> Willie...
>
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