Message-ID: <4F005FF6.7020206@iup.uni-heidelberg.de>
Date: Sun, 01 Jan 2012 14:30:30 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: LF: LF ferrite RX antennas
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Hello Doug,

LF ferrite RX antennas were built and discussed here a few months ago. 
They perform excellent but there is no advantage against a larger loop. 
For me the real only advantage is the handy dimensions so it can find 
its place in a backpack.
I took a few russian ferrite rods from ebay.
If you want, take a look to some photos i took during constructing my 
antenna:

http://dl.dropbox.com/u/19882028/LF/DSC04160.JPG
http://dl.dropbox.com/u/19882028/LF/ferrite%20antenna%20parts.JPG
http://dl.dropbox.com/u/19882028/LF/inside.JPG
http://dl.dropbox.com/u/19882028/LF/Q.jpg
http://dl.dropbox.com/u/19882028/LF/arrangement.JPG
http://dl.dropbox.com/u/19882028/LF/LF-P%20RX%20RIG.JPG
http://dl.dropbox.com/u/19882028/LF/DK7FC_LF_p_active_ferrite_antenna.JPG
http://dl.dropbox.com/u/19882028/LF/DK7FC-p%20LF%20RX.jpg
http://dl.dropbox.com/u/19882028/LF/DK7FC%20LF-p%20RX%20converter.jpg

73, Stefan/DK7FC

PS: There is a design of M0BMU as well!



Am 01.01.2012 14:03, schrieb Douglas D. Williams:
> Mal,
>
> I am currently using an active e-probe antenna that was made by Jack
> Smith at Clifton Laboratories. I asked him to custom modify this one
> to be more sensitive than his standard version below 10 kHz, because I
> plan to use it to try to receive a TA signal on your "dreamer's band".
> He was able to make it quite sensitive down to 3 kHz at the expense of
> using some parts with a lower voltage rating, so I have to be careful
> not to short out the coax, etc. It is located about 15 meters from my
> house and the base of the antenna is a mere 3 meters above ground, and
> about 10 meters from the treeline.
>
> http://i81.photobucket.com/albums/j231/Goranothos/antenna.jpg
>
> My receiver is an Icom R75 (with CW filters), preceded by an LF
> Converter of AMRAD design with a TXCO for frequency stability,
> preceded by a 500 kHz low pass filter.
>
> I also have a Wellbrook LFL1010, which is not currently in service,
> but since this season is starting off so well, I may put it back up
> for comparison with the e-probe.
>
> Over the years, I have used several different antennas for LF
> reception, including tuned longwires, homebrew e-probes that I
> constructed,  homebrew loops, but I must say I am very impressed with
> the Clifton Labs product, as well as the LFL1010, which I used last
> season. Someday I would like to construct a large ferrite core
> receiving antenna.
>
> 73,
> Doug KB4OER
>
>
>
>
>
>
>
>
> On 1/1/12, mal hamilton<g3kevmal@talktalk.net>  wrote:
>    
>> Doug
>> Nice screen shot from you. You are receiving extremely well. What sort of
>> antenna do you use.
>> You might also hear/see me on 500 Khz running 10W erp
>>
>> 73 es tnx
>> de mal/g3kev
>>