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Yes, I have that SW model, but mine was specifically modified
by the seller to cover 3-13 MHz - rather than the 6-20 MHz
range on their standard model shown on the web page.

Although I am still playing with it and testing its performance,
my initial feel is that it is equal in signal capture and noise
to a 40 foot long wire connected to the high impedance antenna
connector on my Kenwood R-5000 and that wire runs just under
the top rail on my rear deck on the back of the house - running
parallel to the house about ten feet away. It is not, however,
as clear and strong (but real close) as what I get on my
75 foot elevated long wire/9:1 balun-transformer/ coax-fed
antenna hanging over the back yard that runs in a E-W direction.

I plan to move it some tonight and see how it works in different
orientations and at different heights and distances from the
house. More on this tomorrow...

First impression is that it works pretty darned well for
how small it is. Wife was not all that keen on my having
to put two holes in the house wall for the two cables
running to it, but she's a good sport and her grumbling
is lower than the antenna's inherent noise floor, so her
whining is not too distracting... ;-)

/////////// Just MY take. Richards //////////
=========================================================
mwwong@... wrote:
.

Hello!
I am interested to see the components list and their approximate price of this DIY loop.
Is it possible? (Perhaps I missed something?)
Aimo.

Jeroen Kloppenburg <3mensions@...> wrote:
--- In loopantennas@..., "Fraser" <fraser.castle@...>

I wrote and recieved the same prompt response. The response suggested
that the WL1030 loop may become available as a built loop. In some ways
this is good but in others it is a pity as I would wish to DIY the loop
in order to keep the costs down A fully built loop with all the
associated production costs and profit margins could end up with a cost
close to that of the Wellbrook ALA1530. Given that choice I would have
to go with the Wellbrook as it has a well proven track record.

Hmm what I understood from Johan in the contact we had over the past
week (quite extensive at times) is that its about delivering parts so
you'll still be building it yourself. But maybe plans have changed, I
don't know. I know quite sure that things are not yet set in stone,
hence I said any interested member of this (and other) group should
email them and express your interest ;)

DIY would be far more fun anyway. Anyone can buy a rx and antenna and
start receiving, building it really has its charm. And aside from
that, you can modify the antenna to suit your specific needs. The
building group we set up will release info with modifications later on
the page. Mods will include frequency changed due to different
ferrite's and windings, other cases, etc. Personally I have plans to
make an ala100 type of box for vacations for example, along with one
base model which will go on top of the roof here.






---------------------------------
Moody friends. Drama queens. Your life? Nope! - their life, your story.
Play Sims Stories at Yahoo! Games.

Not a direct solution, but you might want to look into buying a small
regulated 12 vdc power supply, such as an Astron RS 7A (7 amp) unit and
making up "cables" (of cheap speaker wire, as long you you keep plus and
minus obvious) to a variety of plugs, also available from RS. And a
soldering pencil. The Astron is not a switching supply and I've never
heard any RF noise from either of my mine.
Dave

--- In loopantennas@..., Jose HF Silva <zehelmer@...> wrote:

Pity it's a receive only antenna.

There are a lot of websites with transmitting loop diagrams though.
Shouldnt be hard to dig up a few =)

Hi Guys -- and especially Mr. Boyd =

FALSE ALARM !! SORRY !!

I for got that I had another 12 volt power supply
that I use with various DSP filters. It is also
by RadioShack, also, but much larger, Cat No. 273-1653B
AND IT CAUSES NO SUCH NOISE ! Hurray!!

Boyd - That battery idea is a good one. I will
have to make one up from, perhaps, NiMH cells and an
appropriate battery holder and a project case to sit
by the loop antenna amp/tuner unit. That would be
a good idea in case the power goes out, and I can get
listening with NO RFI/EMI from the house or the
neighbors. I like it when the power fails.

Also, regarding my new antenna farm, it is finally
taking shape with a nice 20 foot high 80 foot
random/long wire running kinda East-West and
employing a 9:1 balun/transformer and coax cable
(with a 1:1 current type line isolation balun in
line on the coax) and an optional earth ground that
can be placed on the balun coax at the point where
the feed line connects to the transformer/antenna
element. (I like to switch it in and out to see
if it matters - and generally it does not.) The
balun manufacturer said it could go either way
depending on the noise situation on the coax outer
shield... does not seem to matter in my QTH. Cannot
explain why as I figured it should matter.

I am also setting up to deploy my trusty old Antenna
Supermarket's Eavesdropper trapped dipole - maybe in
the attic where it was at my last home and used for
an upstairs radio bedside - or possibly stretch in
the back yard. XYL and I are working on where to
place it to have good effect and low visibility.

I also have a short 40 foot random wire concealed and
running along under the railing on my rear deck that
and I use for comparison with the bigger random wire
running perpendicular to it. So far, it is noisier
as it uses a simple insulated wire as a feed line and
does not use a balun/transformer or coax like the
other one. I connect it to the high impedance lugs
on the radio for comparison. The bigger one is
noticeably quieter and has stronger signal capture.

I have also deployed the above-discussed small magnetic
loop antenna (it is only about 14 inches diameter) and
will be installed about fifteen feet above ground and
about 15 to 20 feet away from the house by the end
of Wednesday July 4 holiday. It works pretty well,
considering its very small size. Much better with a
quiet power supply, too!

I have also deployed 1) a Sony AN-LPN1 portable loop
antenna and 2) a Degen/Kaito KA-33 loop antenna -- and
oddly enough the Kaito loop works better in my QTH !
The Sony antenna either works as well as, but not better,
or it performs slightly with more noise and hiss, than
the Kaito product. I cannot explain it, but it does.
These are used with a portable Realistic DX-398 or
Kaito 1102 I use on the night stand when I cannot get
to sleep right away. The work OK, but a short 20
foot sloper running from the bedroom window out away
from the house on an angle attached to a weight in the
yard works just a bit better. These two loops do not
so as well in my downstairs radio room (garden level
with belt high window ledges). This is, of course, as
expected.

Finally, I will soon deploy and test my home-built
North Country Active Antenna - built with some very big
Internet coaching from one of our prominent members. I
am thinking it will work about as well as my new Australian
small loop that was the original subject of this thread.

I may even try the Wellbrook Loop... just have not gotten
up the nerve to order it... (just purchase a new digital
SLR camera system... so kinda feeling guilty today... but
I will get over that soon enough... as soon as the XYL
forgets ... ) ;-)

THEN ... I will complete my studies and take the Tech Test
and work on some HF transmitting antennas (as I will take
General Test soon thereafter...)

Sorry this got long and complicated - BUT IS IS REALLY GOOD
TO GET A DECENT RECEIVING ANTENNA UP and get some decent
reception at my new home. Moving - remodeling - selling old
home and a condo - and getting settled in has been more
hectic and involved than expected. Nice to finally get
feeling at home here.

Cannot express how much I appreciate the several encouraging
notes you have sent over the past few months. Thanks.


Happy trails. /////// Richards ////////
========================================================


ceboyd wrote:

Hi Richards,

i could not answer your query on the DC adapter but i would like to
ask on another matter which is on the PK's Loop performance...

are your referring to the SW620 model and if so, how do your fare its
reception ability compared to a conventional random long wire antenna?...

best regards,

Alan Wong





"JH Richards" <jruing@...>
Sent by: loopantennas@...
07/03/2007 12:51 PM
Please respond to loopantennas

To: loopantennas@...
cc:
Subject: [loopantennas] PK loop power supply problem


G'day mates -- I purchased an active SWL receiving loop antenna from
PK's Loop Antennas in Australia, URL =

I purchased a USA mains AC/DC power adapter at good ol' RadioShack
which, unfortunately, gives off harmful pulsing interference which
sounds like a rat-a-tat-a-tat-a-tat-a-tat and which quits when I
unplug it. Interesting, it slows down and decelerates for a few
seconds after I unplug it - kinda like a motor winding down. I put a
couple of sound "bytes" in the files section labeled appropriately.

Wall wart type 12 volt power supply is Catalog No. 273-1775

Do I just need a different power supply (maybe this one is a switching
type...) and maybe do I need a regulated linear type supply? Or... what?

Any ideas how to power my loop antenna without this interference?

Thanks -- Loop antenna works OK, except for this pulsing interference.

/////////////// Richards /////////////////

Yo Richards: Try a battery. Not to be accused of being flippant, but invest
in a set of rechargables with charger and enjoy noise free reception. Oh,
how's the new antenna farm going? Take care: theboyd

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the loopantennas
group.

File : /Loop power supply noise.wav
Uploaded by : jruingggg <jruing@...>
Description : JR's loop interference sounds

You can access this file at the URL:


To learn more about file sharing for your group, please visit:


Regards,

jruingggg <jruing@...>

G'day mates -- I purchased an active SWL receiving loop antenna from
PK's Loop Antennas in Australia, URL =

I purchased a USA mains AC/DC power adapter at good ol' RadioShack
which, unfortunately, gives off harmful pulsing interference which
sounds like a rat-a-tat-a-tat-a-tat-a-tat and which quits when I
unplug it. Interesting, it slows down and decelerates for a few
seconds after I unplug it - kinda like a motor winding down. I put a
couple of sound "bytes" in the files section labeled appropriately.

Wall wart type 12 volt power supply is Catalog No. 273-1775

Do I just need a different power supply (maybe this one is a switching
type...) and maybe do I need a regulated linear type supply? Or... what?

Any ideas how to power my loop antenna without this interference?

Thanks -- Loop antenna works OK, except for this pulsing interference.

/////////////// Richards /////////////////

Hi,

Just discovered this "new" design.

Pity it's a receive only antenna.

There is a typo at the link: it's only wl1030.com

Thanks for sharing this work to all OM's :-))

73 de Jose' Silva / CT1AXG



____________________________________________________________________________________
Looking for a deal? Find great prices on flights and hotels with Yahoo! FareChase.

"We a in negotiation with a party who want to produce and sell the
antenna. So stay tuned"

Lets hope the kit option is still on the table.

Let me see if I can find out... I'm pretty sure theres a market for
both options TBH. Enough people who want to built such an antenna them
self and experiment with it, while other people simply are happy to
have an affordable alternative to a Wellbrook...

Hmm what I understood from Johan in the contact we had over the past
week (quite extensive at times) is that its about delivering parts

so

you'll still be building it yourself. But maybe plans have changed,

I

don't know. I know quite sure that things are not yet set in stone,
hence I said any interested member of this (and other) group should
email them and express your interest ;)

DIY would be far more fun anyway. Anyone can buy a rx and antenna

and

start receiving, building it really has its charm. And aside from
that, you can modify the antenna to suit your specific needs. The
building group we set up will release info with modifications later

on

the page. Mods will include frequency changed due to different
ferrite's and windings, other cases, etc. Personally I have plans to
make an ala100 type of box for vacations for example, along with one
base model which will go on top of the roof here.

Hi Jeroen,

I couldn't agree more with your comments.

I would far prefer to DIY the loop to suit my needs and preferences.
The idea of an ALA100 type of loop amp also appeals so I would
probably buy several WL1030 "kits" with which to experiment. A
company called "Howes" (now defunct) in the UK used to offer an
active whip antenna kit called the AA2. It was just the PCB and
components and you had to supply the whip and case. That little kit
gave me hours of fun designing a really top notch case and fibreglass
radome assembly. I ended up buying several AA2's for all sorts of
fun 'E' Field antenna experiments :-)

Here is the quote from Johan.....

"We a in negotiation with a party who want to produce and sell the
antenna. So stay tuned"

Lets hope the kit option is still on the table.

Fraser

With many local noise sources to contend with and too many nearby AM
signals w/ splatter and digital sideband hash, I've concluded nulling
is as important as gain.

Nulling is a relatively effective approach to dealing with noise and interference, provided that you only have to contend with a single source of the interference. If so, it's a practical matter of using a second antenna, adjusting the phase and amplitude, and then combining the two so as to cancel the undesired signal.

In the general sense, the problem of cancelling interference is far more demanding and I have yet to see anything that is truly effective. An article that was published in Wireless World many years ago described a system in which the cleaner sideband of an AM signal was selected and the noisier sideband cancelled. I think it was Sony that implemented this in an all-band receiver and it was termed as "adaptive sideband". It is somewhat effective provided that there is a single interfering station and the sidebands of that signal do not overlap the carrier frequency of the desired signal which would place interference on the otherwise "cleaner" sideband of the desired signal.

I spent a considerable amount of time trying to devise a system that would recognize a double sideband (DSB) signal that was symmetrical about a carrier and eliminate anything that was not symmetrical. It's not as simple as you might think. For instance, when you demodulate a DSB signal using a Costas loop, the quadrature arm contains the asymmetrical signals, however those that are above the carrier are subtracted from those below the carrier while in the inphase arm the two are summed together, which leaves you with no opportunity to cancel completely. Doing a quadrature phase shift and then combining allows you to cancel the interference on one side or the other, but not both simultaneously.





Chris

,----------------------. High Performance Mixers and
/ What's all this &#92; Amplifiers for RF Communications
/ extinct stuff, anyhow? /
&#92; _______,--------------' Chris Trask / N7ZWY
_ |/ Principal Engineer
oo&#92; Sonoran Radio Research
(__)&#92; _ P.O. Box 25240
&#92; &#92; .' `. Tempe, Arizona 85285-5240
&#92; &#92; / &#92;
&#92; '" &#92; IEEE Senior Member #40274515
. ( ) &#92;
'-| )__| :. &#92; Email: christrask@...
| | | | &#92; '.
c__; c__; '-..'>.__

Graphics by Loek Frederiks

--- In loopantennas@..., "Fraser" <fraser.castle@...>

I wrote and recieved the same prompt response. The response suggested
that the WL1030 loop may become available as a built loop. In some ways
this is good but in others it is a pity as I would wish to DIY the loop
in order to keep the costs down A fully built loop with all the
associated production costs and profit margins could end up with a cost
close to that of the Wellbrook ALA1530. Given that choice I would have
to go with the Wellbrook as it has a well proven track record.

Hmm what I understood from Johan in the contact we had over the past
week (quite extensive at times) is that its about delivering parts so
you'll still be building it yourself. But maybe plans have changed, I
don't know. I know quite sure that things are not yet set in stone,
hence I said any interested member of this (and other) group should
email them and express your interest ;)

DIY would be far more fun anyway. Anyone can buy a rx and antenna and
start receiving, building it really has its charm. And aside from
that, you can modify the antenna to suit your specific needs. The
building group we set up will release info with modifications later on
the page. Mods will include frequency changed due to different
ferrite's and windings, other cases, etc. Personally I have plans to
make an ala100 type of box for vacations for example, along with one
base model which will go on top of the roof here.

--- In loopantennas@..., "airchecklover" <mdh@...> wrote:

I wrote Johan at WL1030.com using the site's built-in email. Rcv'd a
prompt reply saying I should "stay tuned" as the immediate group is
exploring possilities.

I wrote and recieved the same prompt response. The response suggested
that the WL1030 loop may become available as a built loop. In some ways
this is good but in others it is a pity as I would wish to DIY the loop
in order to keep the costs down A fully built loop with all the
associated production costs and profit margins could end up with a cost
close to that of the Wellbrook ALA1530. Given that choice I would have
to go with the Wellbrook as it has a well proven track record.

Now a simple DIY WL1030 partial kit..... that would be a different
matter. Even if the manufacturer went as far as building the SMD
amplifier for you it would still keep the cost down. We would then have
to construct a loop and case of our choice and cost. Something like
trhe ALA100 but uncased ?

Just my thoughts

Fraser

If you have a link relevant to the group, please post it in the Links section. If you just put it in a message, it will get lost in the shuffle after a few days. The coverage of the list is pretty broad.

All members can upload Links, Files, and Photos.

A few guidelines:

Try to place them in the proper folder, if it exists. If not, you can either just put it in the root folder and eventually I'll move it into the proper place, or create a folder.

When creating a folder or uploading a file or photo, please don't use spaces or punctuation. You can either use caps for the first letter of each word, or use underscore as a space.

Like this: "4x8Loop" or "4x8_loop" or "Steves_4x8_Loop"

Not like this: "Steve's 4 x 8 Loop." That goes for Folder names and File names.

A special note about the Photos section: Although it will allow arbitrarily large images, it will only show them to the moderator and whoever uploaded them. Everyone else can only see a resampled max of 300x400 pixels. So anything over that in Photos is a waste of storage. So crop in to the important parts and resample to about 300x400. For photos, JPG saves smaller and looks better, for line drawings GIF is smaller and looks better. If you need to post a schematic diagram that would be unreadable at 300x400, I strongly suggest the Files section as it has no such limitations.

Feel free to ask if you need help figuring out how to crop and resample. Irfanview is a fairly easy to use program that loads just about any file, you can crop and resample from there:

Or for more complex stuff, another free program is GIMP:

A last note: if you see something in any folder or in the messages that looks like spam or simply inappropriate, don't post on the list- email me directly and tell me about it and I'll take care of it with a minimum of fuss.
loopantennas-owner@...

Thanks,
Steve Greenfield

Hi;

I posted a mini-review of the CCrane Twin-Ferrite maybe a week ago.
Since then I've spent more time learning what the antenna can and
cannot do and how it acts/reacts differently with different radios.
Conclusions-to-date: It's a quirky little gizmo which yields good to
great results on various radios. I hope to post a more detailed report
in the future.

I started wondering about the various antenna configurations I've
seen/read about for AM. There's the ferrite bar, the small single loop
like the AOR LA380, the larger single loop like the Wellbrook or
LA1030 and then there are the larger multi-turn loops normally spun on
a wooden or PCV frame.

With many local noise sources to contend with and too many nearby AM
signals w/ splatter and digital sideband hash, I've concluded nulling
is as important as gain.

Can any one shed light on the relative strengths and differences of
the various above antenna configurations? Did I leave one out? Maybe
Dallas Lankfords active dipole?

Thanks,

Mark/airchecklover

I wrote Johan at WL1030.com using the site's built-in email. Rcv'd a
prompt reply saying I should "stay tuned" as the immediate group is
exploring possilities.

Mark/airchecklover

+++++++++++++++++++++++++++++++

--- In loopantennas@..., "Jeroen Kloppenburg"
<3mensions@...> wrote:

The WL1030 seems to have
produced a lot of interest in the Loop world. I suspect people are
looking for a more affordable alternative to the Wellbrook range of
loops.

I know ;)

Today I compared a online rx with a wl1030 about 30km from me with my
rx with an active loop ('s.htm) and
I actually found my loop with a far better noise/signal ratio... This
is just a onetime 'test' and I dont know wether my location is better
then the online rx (from Johan, the guy behind wl1030.com) but still...

I will contact the WL1030 people and express an interest in any kits
that may be made available.

Do that! And anyone else interested should ;)

The WL1030 seems to have
produced a lot of interest in the Loop world. I suspect people are
looking for a more affordable alternative to the Wellbrook range of
loops.

I know ;)

Today I compared a online rx with a wl1030 about 30km from me with my
rx with an active loop ('s.htm) and
I actually found my loop with a far better noise/signal ratio... This
is just a onetime 'test' and I dont know wether my location is better
then the online rx (from Johan, the guy behind wl1030.com) but still...

I will contact the WL1030 people and express an interest in any kits
that may be made available.

Do that! And anyone else interested should ;)

I'm very sorry to dissapoint you :(

This started out as a small group effort but got known outside of this
group and quickly grew out of capacity. We simply lack the time to
produce this ammount of pcb's and get this ammount of components. Its
all done at cost price and in the spare time of just a few. Making the
pcb's is done by hand by jus a single person for example.

But DO express your interest at the people behind wl10.30.com, I cant
stress this enough. If enough are interested they will have more
possibilities then just a few Ham friends helping eachother!

Hi Jeroen,

No worries :-)

I think what you are doing is very good for the hobby and I personally
thank your little group for even considering acting as a supply agent
for the Wl1030 parts. I can imagine how such an offer to supply parts
can spiral out of control quite quickly ! The WL1030 seems to have
produced a lot of interest in the Loop world. I suspect people are
looking for a more affordable alternative to the Wellbrook range of
loops.

I will contact the WL1030 people and express an interest in any kits
that may be made available.

Best Wishes

Fraser