[TenTec] New Jupiter on its Way _ A Few Questions

Sun Apr 27 03:51:16 EDT 2014

I personally reckon, the Kaeferlein loops are the best on the market! 
The one from Italy I believe uses a Gamma Match for feeding the antenna 
and that might be not the best solution for a mag loop. I know Matthias 
personally, a very nice guy and he worked with Kaeferlein as a teenager, 
to earn some pocket money, so he is well aware of the technics and 
mechanics. But apart from that, the crucial thing is to build them 
proper. I would make them out of one piece and round! But that is only 
my opinion. As I said, I have very good experience with mag loops and 
for someone with no space, they are perfect. Yes, shipping is a big 
problem, but I guess, if you can spend 1200 -1500 Euros on an antenna, 
the extra 200 Euros shipping wouldn't be a problem. I got my 2 loops 
shipped to Australia in a crate, but there was of course other stuff in 
it as well. And for sure, I will never sell them, even though I have 
people asking me about them, you never know what happens in the future 
and I have to move in to an appartment or retirement village and then I 
can use them again ;-)!
Btw, you find ama antennas quite often cheap for sale in cqdl, I got 
mine for a swap of a Gap Challenger and never regretted it.
Enough of that.
73's
Richard

On 27/04/14 16:07, Rick - DJ0IP / NJ0IP wrote:
> Richard's advice is sound.
>
> Kaeferlein "made" good loops.
> However he's gone.
> His successor is Matthias Beese (DH6MM) and he still makes and sells the
> same quality of good loops.
>
> The commercial loop I tested and then used for many years was the Kaeferlein
> AMA-8.
> However as I said, it was actually too large to use indoors.
> I couldn't get it to work on 80m until moving it outdoors.
>
> NOW THE PROBLEM:  Shipping cost to the states is probably about $200 or more
> for even the smallest loop.
>
> There is also an Italian company making great loops.
> They are made by I3VHF.
> See: http://www.ciromazzoni.com/English/Loop%20Antenna.htm
> These will handle more power than the Kaeferlein loops.  Cost more too!
> BUT AGAIN, shipping cost is huge on these.
> DOWNLOAD: (English language) his 48-page document on these antennas and see
> for yourself.
>
> The guy in my club I spoke of earlier with the 80m loop is running the
> "MIDI" loop from this company.  Great product if you don't mind spending
> $1700 on an antenna.
>
> I am unaware of a source for good loops like these in the states.
> Business opportunity? (hi)
>
> 73 - Rick, DJ0IP
> (Nr. Frankfurt am Main)
>
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Richard
> Tschur
> Sent: Sunday, April 27, 2014 1:57 AM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] New Jupiter on its Way _ A Few Questions
>
> Hi all,
> a really good quality magnetic loop is available from Kaeferlein in Germany!
> I have one with 80cm in diameter and it can handle up to 500Watts and it
> performs really well. They are not cheap, but they do perform. I bought mine
> used years ago for like 300 german Marks (good old times;-)), and i had
> great contacts on it. For example, the antenna was mounted about 50 cm above
> ground between the houses and i had a contact from Melbourne VK to Italy
> with 100 watts. But the important thing is, from what I've been told, no
> joins, one loop out of aluminium with at least 33mm diameter. This
> Kaeferlein guy is sort of a pioneer with loops, he made them for decades.
> Just my take on them, so if you have no space, go for a good quality loop,
> you can put them nearly everywhere, in the garage, in the basement, height
> is not really critical, from what I have experienced. Just my take on it.
> Here is the link to Kaeferleins web side www.ama-antennen.de Unfortunately
> only in german, but I think pretty much self explaining.
> I forgot to mention: the loop I have covers 13.5 to 30 MHz. I have another
> one from DJ0HV, he makes sort of homebrew semi comercial, this one is 2 m in
> diameter and covers 80 to 20 m and can handle up to 1 kw.
> The aluminium pipe is 60mm in diameter. Both of them are fully remote
> controllable! The only disadvantage in my opinion is, you have to retune
> every like 15 to 30 KHz, if you transmit, but you get a very selective and
> quiet antenna and in comparison with a dipol, it is maybe half to an s point
> lower! An that, you can compensate with a bit of juice behind the antenna
> ;-)!
>
> Regards and greetings from Down here
> Richard VK3KVK / DK3KVK
>
>
>
> On 27/04/14 06:49, Rockinghorse Winner (Terry) wrote:
>> K8JHR wrote:
>>> I have used the Wellbrook ALA-100M receiving loop for over a decade
>>> with good results at two locations.  It is a "medium or large
>>> aperture" loop, because you supply whatever size wire loop you want.
>>> I used mine outside, but you could do it inside, but of course it
>>> tends to be more RF quiet the farther you get away from your
>>> dwelling.  Wellbrook also makes a model that uses a 1 meter alum
>>> loop, which works well indoors. The loop does not have to be round or
>>> symmetrical, and you can use very light litz wire which is nearly
>>> invisible outside.  They can also be used indoors, as in an attic,
>>> but you don't want to be listening on it when you are transmitting on
>>> it, if you cannot locate it at least 1/4 to 1/2 wavelength away from
>>> the transmitter antenna (which applies to all receive only antennas I
>>> suppose.)  These work on the magnetic portion of the electromagnetic
>>> waves we work with, as does Rick's project.
>>>
>>> See The Wellbrook products here:
>>>
>>> http://www.wellbrook.uk.com/antennashop/
>>>
>>>
>>> I have also used a DX-Engineering active whip with good results. I
>>> have mine in the front yard, away from the transmitting antennas in
>>> the back yard, and it has a very low profile.  These work on the
>>> electrical portion of the electromagnetic waves we work with. They
>>> have a single vertical whip model, and a dipole model, and you can
>>> see them here:
>>>
>>> single vertical model:
>>>
>>> http://www.dxengineering.com/parts/dxe-arav3-1p
>>>
>>> dipole model:
>>>
>>> http://www.dxengineering.com/parts/dxe-arah3-1p
>>>
>>>
>>> I have used both the Wellbrook loop and the DX-E active whip with
>>> good results as receive only HF antenna on my small suburban lot,
>>> although they are substantially more expensive than Rick's home brew
>>> project.  I know several SWL's who have built similar loops to Rick's
>>> project, with good results. It is a classic.
>>>
>>> I went to the Wellbrook site. But the antenna you cited was 60" in
>>> diameter, too large for my room. Did you say they had some smaller
>>> loops? In any case, I'm going to try to build a receive mag loop
>>> according to the instructions Rick provided. It seems like a straight
>>> forward project that should take a few hours at most.
>>> Happy trails.
>>> ----------------------  K8JHR  -----------------------
>>>
>>>
>>>
>>> On 4/25/2014 6:05 PM, Jim Allen wrote:
>>>> You might also consider the helically loaded loops that K8NDS has
>>>> been developing.
>>>
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